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Publish Year |
Description |
Filename |
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Caribou in the Itchas and Ilgachuz - A summary of harvest, inventory and other information 1986
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1986
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With the new 5 point regulation instituted in 1985, the harvest was significantly reduced. In 1983, 56 bulls were harvested; in 1984, 47. The legal harvest in 1985 was 19 with the average age being 5.0. It is expected as hunters become accustomed to the regulation and the younger bulls are afforded more protection, the age and number of bulls harvested will increase.
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wsi_5955_rpt_1986.pdf
(10.3 MB)
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West-Central B.C. Caribou Research Project Annual Report March 1986
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1986
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The West Central B.C. Caribou Study was initiated to investigate the potential effects of logging on woodland caribou populations (Rangifer tarandus caribou) in west central B.C. Ongoing studies by MOE in both Regions 5 and 6 were expanded to include more intensive investigation of winter range and population parameters. The objectives of the study are: 1. To determine seasonal range, habitat use, and food habits of caribou. This information is necessary to develop logging prescriptions which minimize the detrimental effects of logging on caribou. 2. To determine the population size, calf production, calf survival and adult survival to evaluate the current population status and to identify major limiting factors of the caribou. Preliminary results on habitat use, population parameters and winter site investigations are presented in this report.
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wsi_5955_rpt_1985-1986.pdf
(1.1 MB)
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West-Central B.C. Caribou Research Project Progress Report - November 1983 - June 1986
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1986
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Tweedsmuir Park and the area to the east has been identified as a high priority management area for woodland caribou (Rangifer tarandus caribou) (Stevenson and Hatler 1985). Two large groups of woodland caribou inhabit this area. In the north, the Tweedsmuir-Entiako caribou summer in the mountainous area of northern Tweedsmuir Park, migrate south across Tetachuck Lake and winter in the lower elevation pine and pine/spruce forests in the Entiako-Laidman Lake area. In the south, caribou summer in the ltcha-llgachuz and Rainbow mountains and winter in lower elevation pine forests in the area east and southeast of the ltcha mountains. Several groups of caribou also winter in the alpine/subalpine areas on the north side of both the Rainbow and I lgachuz mountains. Until recently, population estimates and seasonal habitat use of the woodland caribou in west-central British Columbia were primarily based on irregularly conducted population surveys and on anecdotal information. Increasing concern over current population status. habitat disturbance by logging and increased accessibility prompted the initiation of studies on radiocollared caribou. Between 1982 and 1984, caribou in both the Tweedsmuir-Entiako area and the ltcha-llgachuz-Rainbow area were radiocollared and basic information on habitat use, seasonal movements and population dynamics was collected. In April 1985, the West Central-B.C. Caribou Study was initiated to investigate the potential effects of logging on caribou in this area. The original studies were expanded to include more intensive investigation of winter range and population parameters. The objectives of the study are: 1. to determine seasonal range, habitat use, and food habits of caribou. This information is necessary to develop logging prescriptions which minimize the detrtmental effects of logging on caribou. 2. to determine population size. calf production, calf survival and adult survival so that the current population status and ...
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wsi_5955_rpt_1983-1986.pdf
(3.1 MB)
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Working Plan - West-Central B.C. Caribou-Forestry Research Project
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1986
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Tweedsmuir Park and the area east of the park including the Fawnie and Itcha-Ilgachuz ranges (Fig. 1) has been identified as a high priority caribou management area in B.C. (Stevenson and Hatler 1985). This area currently supports a large caribou population (2000-3000 animals) and it is believed that the area is one of only two remaining areas in the southern half of B.C. that can sustain substantial caribou populations in the future. Although the area within the park is protected, much of the area outside of the park is scheduled to be logged. Therefore there is a need to increase our understanding of logging/caribou interactions in this area to ensure that logging activity does not threaten these caribou populations. Caribou populations have declined throughout North America as human activities encroached on their habitat (Bergerud 1974). These declines have been attributed to: 1) a reduction in winter food supplies, particularly lichens, due to habitat destruction (Edwards 1954, Bloomfield 1980), 2) overhunting, often due to improved hunter access (Bergerud 1974, Bloomfield 1980), 3) increased predation due to habitat changes which benefit wolves (Bergerud 1974, Bergerud et al. 1984) and 4) abandonment of ranges due to disturbance (Bloomfield 1980). Because all of these factors are somewhat related to logging, it is generally perceived that logging is detrimental to caribou. This perception has led to recommendations for restrictions on logging activity in caribou range (Bloomfield 1980, Bjorge 1984). There have been several studies of caribou in southeastern B.C. However the caribou in west-central B.C. belong to a different "ecotype" than the caribou in the southeast (Stevenson and Hatler 1985). Therefore it is inappropriate to extrapolate the research results from the southeastern studies to develop management guidelines for west-central B.C. The purpose of this study is to increase our understanding of caribou/forestry interactions in west ...
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wsi_5955_rpt_1986.pdf
(500 KB)
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West-Central BC Caribou Research Project Annual Report - March 1988
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1988
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In April 1985, the West-Central B.C. Caribou Study was initiated to investigate the potential effects of logging on woodland caribou (Rangifer tarandus caribou) in the Tweedsmuir-Entiako and ltcha-llgachuz-Rainbow areas in west central B.C. The primary objectives of the study were to determine seasonal range, habitat use and food habits of the caribou, and to determine population size, calf production, calf survival and adult survival so that current population
status and major limiting factors could be determined. The objectives were achieved through studies of radio collared caribou in the two areas. This report summarizes the results of the data collected during the third year (April 1987 March 1988) of the study.
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wsi_5955_rpt_1988.pdf
(2.7 MB)
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West-Central BC Caribou Research Project Annual Report - March 1988
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1988
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In April 1985, the West-Central B.C. Caribou Study was initiated to investigate the potential effects of logging on woodland caribou (Rangifer tarandus caribou) in the Tweedsmuir-Entiako and ltcha-llgachuz-Rainbow areas in west central B.C. The primary objectives of the study were to determine seasonal range, habitat use and food habits of the caribou, and to determine population size, calf production, calf survival and adult survival so that current population status and major limiting factors could be determined. The objectives were achieved through studies of radio collared caribou in the two areas. This report summarizes the results of the data collected during the third year (April 1987 March 1988) of the study.
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wsi_5955_rpt_1988.pdf
(2.7 MB)
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West-Central BC Caribou Research Project Annual Report - March 1988
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1988
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In April 1985, the West-Central B.C. Caribou Study was initiated to investigate the potential effects of logging on woodland caribou (Rangifer tarandus caribou) in the Tweedsmuir-Entiako and ltcha-llgachuz-Rainbow areas in west central B.C. The primary objectives of the study were to determine seasonal range, habitat use and food habits of the caribou, and to determine population size, calf production, calf survival and adult survival so that current population status and major limiting factors could be determined. The objectives were achieved through studies of radio collared caribou in the two areas. This report summarizes the results of the data collected during the third year (April 1987 March 1988) of the study.
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wsi_5955_rpt_1988.pdf
(2.7 MB)
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West-Central B.C. Caribou Research Project Progress Report - April, 1985 - March 1988
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1989
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Tweedsmuir Park and the area to the east has been identified as a high priority management area for woodland caribou (Rangifer tarandus caribou) (Stevenson and Hatler 1985). Two large groups of woodland caribou inhabit this area. In the north, the Tweedsmuir-Entiako caribou summer in the mountainous area of northern Tweedsmuir Park, migrate south across Tetachuck Lake and winter in the lower elevation pine and pine/spruce forests in the Entiako-Laidman Lake area. In the south, caribou summer in the Itcha-Ilgachuz and Rainbow mountains and winter in lower elevation pine forests in the area east and southeast of the Itcha mountains. Several groups of caribou also winter in the alpine/subalpine areas on the north side of both the Rainbow and Ilgachuz mountains. Because caribou in both areas winter primarily in lower elevation forested areas, potential conflicts with logging were anticipated. Increasing concern over current population status, habitat disturbance by logging and increased accessibility prompted the initiation of studies on radiocollared caribou. Between 1982 and 1984, caribou in both the Tweedsmuir-Entiako area and the Itcha-Ilgachuz-Rainbow area were radiocollared and basic information on habitat use, seasonal movements and population dynamics was collected. In April 1985, the West Central-B.C:. Car.ibou Study was initiated to investigate the potential effects of logging on caribou in this area. The original studies were expanded to include more intensive investigation of winter range and population parameters. The objectives of the study were: 1. to determine seasonal range, habitat use, and food habits of caribou. This information ts necessary to develop logging prescriptions which minmimfze the detrimental effects of logging on caribou. 2. to determine population size, calf production, calf survival and adult survival so that the current population status and major limiting factors can be determined.
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wsi_5955_rpt_1985-1988.pdf
(2.6 MB)
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Habitat Use, Winter Feeding Ecology, and Population Status of Woodland Caribou in West-Central British Columbia
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1990
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Tweedsmuir Park and the area adjacent to the east supports two populations of woodland caribou (Rangifer tarandus caribou): the Tweedsmuir-Entiako population, and the ltcha-llgachuz-Rainbow population. The area was identified as a high priority management area for woodland caribou in British Columbia (Stevenson and Hatler 1985). Increasing concern over population status, winter habitat disturbance through logging and increasing accessibility, prompted the initiation of the West Central B.C. Caribou Research Project. The objectives of the study were to determine seasonal movements, habitat use and food habits of the caribou, especially during winter, and to determine population size, calf production, calf survival and adult survival to assess population status and limiting factors.
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wsi_5955_rpt_1990.pdf
(5.5 MB)
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Summary of Recent Itcha Ilgachuz Caribou Surveys
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1991
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This survey, having been conducted over the last few years is designed to measure calf production. Recent surveys have indicated this area may have the highest calf ratios. Depending on whether the bulls (which arrive on calving/post calving areas later) have mixed with the nursery groups, attempts are made to classify them out to improve the accuracy of the cow: calf ratios. Unfortunately group size did not allow us to classify out the bulls without over-stressing the cows and calves.
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wsi_5955_rpt_1991.pdf
(158 KB)
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Population Status and Habitat Use of Woodland Caribou (Rangifer Tarandus Caribou) in the Itchas, Ilgachuz, and Rainbow Ranges, British Columbia
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1996
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The purpose of this document was to synthesize the existing information pertaining to the Itchas-Ilgachuz-Rainbow (Western) caribou population as of 1996. This paper was designed as a resource aid for the Regional Caribou Strategy Committee when developing an integrated management approach for caribou habitat in the Western Cariboo Region as directed by the Cariboo-Chilcotin Land-Use Plan (CCLUP).
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wsi_5955_rpt_1996.pdf
(2 MB)
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Summary of the 1994 Post Calving and Rut Survey for the Itcha-Ilgachuz Mountains Cariboo Region
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1997
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To monitor population trend, sex ration, and calf recruitment within the Icha Ilgachuz Mountains caribou population, two aerial total count surveys were undertaken in 1994.
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wsi_5955_rpt_1994PostCalvingRut.pdf
(8.2 MB)
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Summary of the 1994 Post Calving and Rut Survey for the Itcha-Ilgachuz Mountains Cariboo Region
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1997
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To monitor population trend, sex ration, and calf recruitment within the Icha Ilgachuz Mountains caribou population, two aerial total count surveys were undertaken in 1994.
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wsi_5955_rpt_1994PostCalvingRut.pdf
(8.2 MB)
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Summary of the 1995 Post Calving and Rut Surveys and the 1996 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains, Cariboo Region
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1997
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The Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 21 and 22 observed a total of 1466 caribou; 681 cows, 450 calves, 229 bulls, 71 yearling cows and 35 yearling bulls. The observed calf/100 cow ratio was 70/100 in the Itcha-Ilgachuz herd and 31/100 in the Rainbow herd. Yearlings/100 cows were observed at 16/100. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 18 and 19 observed 438 caribou; 279 cows, 80 calves, 30 medium bulls and 49 mature bulls. The observed calf/100 cow and bull/100 cow ratio in the Itcha-Ilgachuz herd were 40/100 and 23/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 13/100 and the bull/100 cow ratio was 36/100. The March late winter survey observed 314 caribou; 172 in forest and 142 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 21% and the Rainbow calf percentage was assumed to be 11%. The bull/cow and mature bull/medium bull ratios in the Rainbow herd were higher than the Itcha-Ilgachuz herd. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. Further studies coupled with population modeling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1995-1996.pdf
(899 KB)
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Summary of the 1995 Post Calving and Rut Surveys and the 1996 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains, Cariboo Region
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1997
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The Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 21 and 22 observed a total of 1466 caribou; 681 cows, 450 calves, 229 bulls, 71 yearling cows and 35 yearling bulls. The observed calf/100 cow ratio was 70/100 in the Itcha-Ilgachuz herd and 31/100 in the Rainbow herd. Yearlings/100 cows were observed at 16/100. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 18 and 19 observed 438 caribou; 279 cows, 80 calves, 30 medium bulls and 49 mature bulls. The observed calf/100 cow and bull/100 cow ratio in the Itcha-Ilgachuz herd were 40/100 and 23/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 13/100 and the bull/100 cow ratio was 36/100. The March late winter survey observed 314 caribou; 172 in forest and 142 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 21% and the Rainbow calf percentage was assumed to be 11%. The bull/cow and mature bull/medium bull ratios in the Rainbow herd were higher than the Itcha-Ilgachuz herd. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. Further studies coupled with population modeling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1995-1996.pdf
(899 KB)
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Summary of the 1995 Post Calving and Rut Surveys and the 1996 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains, Cariboo Region
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1997
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The Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 21 and 22 observed a total of 1466 caribou; 681 cows, 450 calves, 229 bulls, 71 yearling cows and 35 yearling bulls. The observed calf/100 cow ratio was 70/100 in the Itcha-Ilgachuz herd and 31/100 in the Rainbow herd. Yearlings/100 cows were observed at 16/100. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 18 and 19 observed 438 caribou; 279 cows, 80 calves, 30 medium bulls and 49 mature bulls. The observed calf/100 cow and bull/100 cow ratio in the Itcha-Ilgachuz herd were 40/100 and 23/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 13/100 and the bull/100 cow ratio was 36/100. The March late winter survey observed 314 caribou; 172 in forest and 142 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 21% and the Rainbow calf percentage was assumed to be 11%. The bull/cow and mature bull/medium bull ratios in the Rainbow herd were higher than the Itcha-Ilgachuz herd. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. Further studies coupled with population modeling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1995-1996.pdf
(899 KB)
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Summary of the 1995 Post Calving and Rut Surveys and the 1996 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains, Cariboo Region
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1997
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The Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 21 and 22 observed a total of 1466 caribou; 681 cows, 450 calves, 229 bulls, 71 yearling cows and 35 yearling bulls. The observed calf/100 cow ratio was 70/100 in the Itcha-Ilgachuz herd and 31/100 in the Rainbow herd. Yearlings/100 cows were observed at 16/100. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 18 and 19 observed 438 caribou; 279 cows, 80 calves, 30 medium bulls and 49 mature bulls. The observed calf/100 cow and bull/100 cow ratio in the Itcha-Ilgachuz herd were 40/100 and 23/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 13/100 and the bull/100 cow ratio was 36/100. The March late winter survey observed 314 caribou; 172 in forest and 142 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 21% and the Rainbow calf percentage was assumed to be 11%. The bull/cow and mature bull/medium bull ratios in the Rainbow herd were higher than the Itcha-Ilgachuz herd. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. Further studies coupled with population modeling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1995-1996.pdf
(899 KB)
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Summary of the 1996 Post Calving and Rut Surveys and the 1997 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains, Cariboo Region
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1998
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The Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 27 and 28 observed a total of 1400 caribou; 648 cows, 358 calves, 204 bulls, 71 yearling cows, 100 yearling bulls and 19 unsexed yearlings. The observed calf/100 cow ratio was 55/100 in the Itcha-Ilgachuz herd and 57/100 in the Rainbow herd. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 29 and 30 observed 819 caribou; 585 cows, 135 calves, 61 medium bulls and 38 mature bulls. The observed calf/100 cow and bull/100 cow ratios in the Itcha-Ilgachuz herd were 26/100 and 16/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 9/100 and the bull/100 cow ratio was 24/100. The April late winter survey observed 288 caribou; 244 in forest and 44 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 17% and the Rainbow calf percentage was assumed to be 3%. The bull/cow and mature bull/medium bull ratios in the Rainbow herd were higher than the Itcha-Ilgachuz herd. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. Further studies coupled with population modeling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1996-1997.pdf
(2.2 MB)
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Summary of the 1996 Post Calving and Rut Surveys and the 1997 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains, Cariboo Region
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1998
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The Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 27 and 28 observed a total of 1400 caribou; 648 cows, 358 calves, 204 bulls, 71 yearling cows, 100 yearling bulls and 19 unsexed yearlings. The observed calf/100 cow ratio was 55/100 in the Itcha-Ilgachuz herd and 57/100 in the Rainbow herd. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 29 and 30 observed 819 caribou; 585 cows, 135 calves, 61 medium bulls and 38 mature bulls. The observed calf/100 cow and bull/100 cow ratios in the Itcha-Ilgachuz herd were 26/100 and 16/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 9/100 and the bull/100 cow ratio was 24/100. The April late winter survey observed 288 caribou; 244 in forest and 44 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 17% and the Rainbow calf percentage was assumed to be 3%. The bull/cow and mature bull/medium bull ratios in the Rainbow herd were higher than the Itcha-Ilgachuz herd. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. Further studies coupled with population modeling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1996-1997.pdf
(2.2 MB)
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Summary of the 1996 Post Calving and Rut Surveys and the 1997 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains, Cariboo Region
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1998
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The Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 27 and 28 observed a total of 1400 caribou; 648 cows, 358 calves, 204 bulls, 71 yearling cows, 100 yearling bulls and 19 unsexed yearlings. The observed calf/100 cow ratio was 55/100 in the Itcha-Ilgachuz herd and 57/100 in the Rainbow herd. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 29 and 30 observed 819 caribou; 585 cows, 135 calves, 61 medium bulls and 38 mature bulls. The observed calf/100 cow and bull/100 cow ratios in the Itcha-Ilgachuz herd were 26/100 and 16/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 9/100 and the bull/100 cow ratio was 24/100. The April late winter survey observed 288 caribou; 244 in forest and 44 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 17% and the Rainbow calf percentage was assumed to be 3%. The bull/cow and mature bull/medium bull ratios in the Rainbow herd were higher than the Itcha-Ilgachuz herd. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. Further studies coupled with population modeling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1996-1997.pdf
(2.2 MB)
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Summary of the 1996 Post Calving and Rut Surveys and the 1997 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains, Cariboo Region
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1998
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The Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 27 and 28 observed a total of 1400 caribou; 648 cows, 358 calves, 204 bulls, 71 yearling cows, 100 yearling bulls and 19 unsexed yearlings. The observed calf/100 cow ratio was 55/100 in the Itcha-Ilgachuz herd and 57/100 in the Rainbow herd. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 29 and 30 observed 819 caribou; 585 cows, 135 calves, 61 medium bulls and 38 mature bulls. The observed calf/100 cow and bull/100 cow ratios in the Itcha-Ilgachuz herd were 26/100 and 16/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 9/100 and the bull/100 cow ratio was 24/100. The April late winter survey observed 288 caribou; 244 in forest and 44 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 17% and the Rainbow calf percentage was assumed to be 3%. The bull/cow and mature bull/medium bull ratios in the Rainbow herd were higher than the Itcha-Ilgachuz herd. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. Further studies coupled with population modeling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1996-1997.pdf
(2.2 MB)
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Summary of the 1997 Post Calving and Rut Surveys and the 1998 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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1998
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As part of ongoing monitoring, the Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 20 and July 3 observed a total of 1800 caribou; 840 cows, 460 calves, 233 bulls, 84 yearling cows, 83 yearling bulls and 100 unsexed animals. The observed calf/100 cow ratio was 56/100 in the Itcha-Ilgachuz herd and 35/100 in the Rainbow herd. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 20 and 21 observed 726 caribou; 448 cows, 87 calves, 75 mature bulls and 61 immature bulls. The observed calf/100 cow and bull/100 cow ratios in the Itcha-Ilgachuz herd were 23/100 and 31/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 4/100 and the bull/100 cow ratio was 27/100. The April late winter survey on March 27 and 28 observed 677 caribou; 674 in forest and 3 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 13.4% and the Rainbow calf percentage was assumed to be 7%. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. The Rainbow Mountains herd showed low calf recruitment numbers but bull to cow ratios were higher than those found within the Itcha-Ilgachuz herd. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1997-1998.pdf
(4.7 MB)
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Summary of the 1997 Post Calving and Rut Surveys and the 1998 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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1998
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As part of ongoing monitoring, the Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 20 and July 3 observed a total of 1800 caribou; 840 cows, 460 calves, 233 bulls, 84 yearling cows, 83 yearling bulls and 100 unsexed animals. The observed calf/100 cow ratio was 56/100 in the Itcha-Ilgachuz herd and 35/100 in the Rainbow herd. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 20 and 21 observed 726 caribou; 448 cows, 87 calves, 75 mature bulls and 61 immature bulls. The observed calf/100 cow and bull/100 cow ratios in the Itcha-Ilgachuz herd were 23/100 and 31/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 4/100 and the bull/100 cow ratio was 27/100. The April late winter survey on March 27 and 28 observed 677 caribou; 674 in forest and 3 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 13.4% and the Rainbow calf percentage was assumed to be 7%. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. The Rainbow Mountains herd showed low calf recruitment numbers but bull to cow ratios were higher than those found within the Itcha-Ilgachuz herd. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1997-1998.pdf
(4.7 MB)
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Summary of the 1997 Post Calving and Rut Surveys and the 1998 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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1998
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As part of ongoing monitoring, the Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 20 and July 3 observed a total of 1800 caribou; 840 cows, 460 calves, 233 bulls, 84 yearling cows, 83 yearling bulls and 100 unsexed animals. The observed calf/100 cow ratio was 56/100 in the Itcha-Ilgachuz herd and 35/100 in the Rainbow herd. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 20 and 21 observed 726 caribou; 448 cows, 87 calves, 75 mature bulls and 61 immature bulls. The observed calf/100 cow and bull/100 cow ratios in the Itcha-Ilgachuz herd were 23/100 and 31/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 4/100 and the bull/100 cow ratio was 27/100. The April late winter survey on March 27 and 28 observed 677 caribou; 674 in forest and 3 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 13.4% and the Rainbow calf percentage was assumed to be 7%. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. The Rainbow Mountains herd showed low calf recruitment numbers but bull to cow ratios were higher than those found within the Itcha-Ilgachuz herd. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1997-1998.pdf
(4.7 MB)
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Summary of the 1997 Post Calving and Rut Surveys and the 1998 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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1998
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As part of ongoing monitoring, the Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratio, and calf recruitment. The post calving survey completed on June 20 and July 3 observed a total of 1800 caribou; 840 cows, 460 calves, 233 bulls, 84 yearling cows, 83 yearling bulls and 100 unsexed animals. The observed calf/100 cow ratio was 56/100 in the Itcha-Ilgachuz herd and 35/100 in the Rainbow herd. Cows with calves were found at higher elevations than cows without calves, with yearling and adult bulls being found at the lowest elevations. The October rut survey on October 20 and 21 observed 726 caribou; 448 cows, 87 calves, 75 mature bulls and 61 immature bulls. The observed calf/100 cow and bull/100 cow ratios in the Itcha-Ilgachuz herd were 23/100 and 31/100, respectively. In the Rainbow herd the observed calf/100 cow ratio was 4/100 and the bull/100 cow ratio was 27/100. The April late winter survey on March 27 and 28 observed 677 caribou; 674 in forest and 3 in alpine habitat. The Itcha-Ilgachuz herd calf percentage was estimated at 13.4% and the Rainbow calf percentage was assumed to be 7%. The Itcha-Ilgachuz herd appears to be stable, with an adequate calf recruitment but a low bull to cow ratio. The Rainbow Mountains herd showed low calf recruitment numbers but bull to cow ratios were higher than those found within the Itcha-Ilgachuz herd. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1997-1998.pdf
(4.7 MB)
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Summary of the 1998 Post Calving and Rut Surveys and the 1999 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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1999
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As part of ongoing monitoring, the Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on June 20 and June 21, 1998 observed a total of 2219 caribou; 1060 cows, 578 calves, 349 bulls, 4 yearling cows, 35 yearling bulls and 193 unsexed animals. The observed percent calves was 26.3 in the Itcha-Ilgachuz Herd and 21.4 in the Rainbow Herd. No significant differences in elevation use were found from one age/sex group to the next. The 1998 October rut survey on October 19 and 20 observed 749 caribou; 495 cows, 123 calves, 68 mature bulls and 63 immature bulls. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were both 26/100. In the Rainbow Herd the observed calf/100 cow ratio was 18/100 and the bull/100 cow ratio was 27/100. The late winter survey on March 16 and 17 observed 309 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 14.6% and the Rainbow calf percentage was assumed to be 9%. The Itcha-Ilgachuz Herd appears to be increasing, with adequate calf recruitment and an increasing bull to cow ratio. The Rainbow Mountains Herd showed lower calf recruitment numbers but a more adequate bull to cow ratio. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1998-1999.pdf
(2.3 MB)
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Summary of the 1998 Post Calving and Rut Surveys and the 1999 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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1999
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As part of ongoing monitoring, the Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on June 20 and June 21, 1998 observed a total of 2219 caribou; 1060 cows, 578 calves, 349 bulls, 4 yearling cows, 35 yearling bulls and 193 unsexed animals. The observed percent calves was 26.3 in the Itcha-Ilgachuz Herd and 21.4 in the Rainbow Herd. No significant differences in elevation use were found from one age/sex group to the next. The 1998 October rut survey on October 19 and 20 observed 749 caribou; 495 cows, 123 calves, 68 mature bulls and 63 immature bulls. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were both 26/100. In the Rainbow Herd the observed calf/100 cow ratio was 18/100 and the bull/100 cow ratio was 27/100. The late winter survey on March 16 and 17 observed 309 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 14.6% and the Rainbow calf percentage was assumed to be 9%. The Itcha-Ilgachuz Herd appears to be increasing, with adequate calf recruitment and an increasing bull to cow ratio. The Rainbow Mountains Herd showed lower calf recruitment numbers but a more adequate bull to cow ratio. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1998-1999.pdf
(2.3 MB)
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Summary of the 1998 Post Calving and Rut Surveys and the 1999 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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1999
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As part of ongoing monitoring, the Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on June 20 and June 21, 1998 observed a total of 2219 caribou; 1060 cows, 578 calves, 349 bulls, 4 yearling cows, 35 yearling bulls and 193 unsexed animals. The observed percent calves was 26.3 in the Itcha-Ilgachuz Herd and 21.4 in the Rainbow Herd. No significant differences in elevation use were found from one age/sex group to the next. The 1998 October rut survey on October 19 and 20 observed 749 caribou; 495 cows, 123 calves, 68 mature bulls and 63 immature bulls. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were both 26/100. In the Rainbow Herd the observed calf/100 cow ratio was 18/100 and the bull/100 cow ratio was 27/100. The late winter survey on March 16 and 17 observed 309 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 14.6% and the Rainbow calf percentage was assumed to be 9%. The Itcha-Ilgachuz Herd appears to be increasing, with adequate calf recruitment and an increasing bull to cow ratio. The Rainbow Mountains Herd showed lower calf recruitment numbers but a more adequate bull to cow ratio. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1998-1999.pdf
(2.3 MB)
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Summary of the 1998 Post Calving and Rut Surveys and the 1999 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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1999
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As part of ongoing monitoring, the Itcha, Ilgachuz, and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on June 20 and June 21, 1998 observed a total of 2219 caribou; 1060 cows, 578 calves, 349 bulls, 4 yearling cows, 35 yearling bulls and 193 unsexed animals. The observed percent calves was 26.3 in the Itcha-Ilgachuz Herd and 21.4 in the Rainbow Herd. No significant differences in elevation use were found from one age/sex group to the next. The 1998 October rut survey on October 19 and 20 observed 749 caribou; 495 cows, 123 calves, 68 mature bulls and 63 immature bulls. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were both 26/100. In the Rainbow Herd the observed calf/100 cow ratio was 18/100 and the bull/100 cow ratio was 27/100. The late winter survey on March 16 and 17 observed 309 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 14.6% and the Rainbow calf percentage was assumed to be 9%. The Itcha-Ilgachuz Herd appears to be increasing, with adequate calf recruitment and an increasing bull to cow ratio. The Rainbow Mountains Herd showed lower calf recruitment numbers but a more adequate bull to cow ratio. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the CCLUP (Cariboo-Chilcotin Land Use Plan).
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wsi_5955_rpt_1998-1999.pdf
(2.3 MB)
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Summary of the 1999 Post Calving and Rut Surveys and the 2000 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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2001
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As part of ongoing monitoring, the Itcha-Ilgachuz and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on July 13, 14 and 21, 1999 observed a total of 1850 caribou; 936 cows, 404 calves, 294 bulls, 19 yearling cows, 26 yearling bulls and 171 unsexed animals. The observed percent calves was 21.9 in the Itcha-Ilgachuz Herd and 19.8 in the Rainbow Herd. No significant differences in elevation use were found among adult cows, cows with calves or yearlings; however, adult bulls and unclassified adults were both significantly different from all the age/sex groups. The 1999 October rut survey on October 19 and 20 observed 1038 caribou; 658 cows, 193 calves, 94 mature bulls, 90 immature bulls and 3 unclassified. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were 29/100 and 26/100, respectively. In the Rainbow Herd the observed calf/100 cow ratio was 29/100 and the bull/100 cow ratio was 43/100. The late winter survey on April 11 observed 452 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 15.8% and the Rainbow calf percentage was assumed to be 13.0%. The Itcha-Ilgachuz Herd appears to be stable to increasing, with adequate calf recruitment and an increasing bull to cow ratio: the estimated population is 1900-2000 caribou with a density of 0.19 caribou/km2. The Rainbow Mountains Herd showed greater calf recruitment numbers and a relatively high bull to cow ratio compared to recent years: the estimated population was 125 animals at a density of 0.028 caribou/km2. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the Cariboo-Chilcotin Land Use Plan (CCLUP).
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wsi_5955_rpt_1999-2000.pdf
(4.1 MB)
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Summary of the 1999 Post Calving and Rut Surveys and the 2000 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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2001
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As part of ongoing monitoring, the Itcha-Ilgachuz and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on July 13, 14 and 21, 1999 observed a total of 1850 caribou; 936 cows, 404 calves, 294 bulls, 19 yearling cows, 26 yearling bulls and 171 unsexed animals. The observed percent calves was 21.9 in the Itcha-Ilgachuz Herd and 19.8 in the Rainbow Herd. No significant differences in elevation use were found among adult cows, cows with calves or yearlings; however, adult bulls and unclassified adults were both significantly different from all the age/sex groups. The 1999 October rut survey on October 19 and 20 observed 1038 caribou; 658 cows, 193 calves, 94 mature bulls, 90 immature bulls and 3 unclassified. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were 29/100 and 26/100, respectively. In the Rainbow Herd the observed calf/100 cow ratio was 29/100 and the bull/100 cow ratio was 43/100. The late winter survey on April 11 observed 452 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 15.8% and the Rainbow calf percentage was assumed to be 13.0%. The Itcha-Ilgachuz Herd appears to be stable to increasing, with adequate calf recruitment and an increasing bull to cow ratio: the estimated population is 1900-2000 caribou with a density of 0.19 caribou/km2. The Rainbow Mountains Herd showed greater calf recruitment numbers and a relatively high bull to cow ratio compared to recent years: the estimated population was 125 animals at a density of 0.028 caribou/km2. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the Cariboo-Chilcotin Land Use Plan (CCLUP).
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wsi_5955_rpt_1999-2000.pdf
(4.1 MB)
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Summary of the 1999 Post Calving and Rut Surveys and the 2000 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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2001
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As part of ongoing monitoring, the Itcha-Ilgachuz and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on July 13, 14 and 21, 1999 observed a total of 1850 caribou; 936 cows, 404 calves, 294 bulls, 19 yearling cows, 26 yearling bulls and 171 unsexed animals. The observed percent calves was 21.9 in the Itcha-Ilgachuz Herd and 19.8 in the Rainbow Herd. No significant differences in elevation use were found among adult cows, cows with calves or yearlings; however, adult bulls and unclassified adults were both significantly different from all the age/sex groups. The 1999 October rut survey on October 19 and 20 observed 1038 caribou; 658 cows, 193 calves, 94 mature bulls, 90 immature bulls and 3 unclassified. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were 29/100 and 26/100, respectively. In the Rainbow Herd the observed calf/100 cow ratio was 29/100 and the bull/100 cow ratio was 43/100. The late winter survey on April 11 observed 452 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 15.8% and the Rainbow calf percentage was assumed to be 13.0%. The Itcha-Ilgachuz Herd appears to be stable to increasing, with adequate calf recruitment and an increasing bull to cow ratio: the estimated population is 1900-2000 caribou with a density of 0.19 caribou/km2. The Rainbow Mountains Herd showed greater calf recruitment numbers and a relatively high bull to cow ratio compared to recent years: the estimated population was 125 animals at a density of 0.028 caribou/km2. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the Cariboo-Chilcotin Land Use Plan (CCLUP).
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wsi_5955_rpt_1999-2000.pdf
(4.1 MB)
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Summary of the 1999 Post Calving and Rut Surveys and the 2000 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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2001
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As part of ongoing monitoring, the Itcha-Ilgachuz and Rainbow Mountains caribou population was surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on July 13, 14 and 21, 1999 observed a total of 1850 caribou; 936 cows, 404 calves, 294 bulls, 19 yearling cows, 26 yearling bulls and 171 unsexed animals. The observed percent calves was 21.9 in the Itcha-Ilgachuz Herd and 19.8 in the Rainbow Herd. No significant differences in elevation use were found among adult cows, cows with calves or yearlings; however, adult bulls and unclassified adults were both significantly different from all the age/sex groups. The 1999 October rut survey on October 19 and 20 observed 1038 caribou; 658 cows, 193 calves, 94 mature bulls, 90 immature bulls and 3 unclassified. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were 29/100 and 26/100, respectively. In the Rainbow Herd the observed calf/100 cow ratio was 29/100 and the bull/100 cow ratio was 43/100. The late winter survey on April 11 observed 452 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 15.8% and the Rainbow calf percentage was assumed to be 13.0%. The Itcha-Ilgachuz Herd appears to be stable to increasing, with adequate calf recruitment and an increasing bull to cow ratio: the estimated population is 1900-2000 caribou with a density of 0.19 caribou/km2. The Rainbow Mountains Herd showed greater calf recruitment numbers and a relatively high bull to cow ratio compared to recent years: the estimated population was 125 animals at a density of 0.028 caribou/km2. Further studies coupled with population modelling will be necessary to confidently produce a long-term caribou strategy as required by the Cariboo-Chilcotin Land Use Plan (CCLUP).
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wsi_5955_rpt_1999-2000.pdf
(4.1 MB)
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Summary of the 2000 Post Calving and Rut Surveys and the 2001 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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2001
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As part of ongoing monitoring, the Itcha-Ilgachuz and Rainbow Mountains caribou herds were surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on June 20, 21 and 22, 2000 observed a total of 2224 caribou; 1139 cows, 692 calves, 272 bulls, 38 yearling cows, 59 yearling bulls; 12 unsexed adults and 12 unsexed yearlings. The observed percent calves was 31.1% in the Itcha-Ilgachuz Herd and 33.3% in the Rainbow Herd. No significant differences in elevation use were observed among adult cows, cows with calves, yearling cows or unsexed yearlings. There were also no significant differences among adult bulls, yearling bulls and unclassified adults; however elevation use by the male caribou groups was significantly different from that used by the female caribou groups. The 2000 rut survey on October 31 and November 1 observed 731 caribou; 398 cows, 130 calves, 52 mature bulls, 68 immature bulls and 83 unclassified caribou. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were 33/100 and 32/100, respectively. In the Rainbow Herd the observed calf/100 cow ratio was 31/100 and the bull/100 cow ratio was 23/100. The late winter survey on March 15 observed 529 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 15.3% and the Rainbow calf percentage was estimated at 16.7%. The Itcha- Ilgachuz Herd appears to be stable to increasing, with adequate calf recruitment and an increasing bull to cow ratio: the estimated population is 2000 caribou with a density of 0.20 caribou/km2. The Rainbow Mountains Herd showed greater calf recruitment numbers and a relatively high bull to cow ratio compared to recent years: the estimated population was 125 animals at a density of 0.028 caribou/km2. Further studies coupled with population modelling will be necessary to confidently produce a long-term car ...
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wsi_5955_rpt_2000-2001.pdf
(4.3 MB)
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Summary of the 2000 Post Calving and Rut Surveys and the 2001 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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2001
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As part of ongoing monitoring, the Itcha-Ilgachuz and Rainbow Mountains caribou herds were surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on June 20, 21 and 22, 2000 observed a total of 2224 caribou; 1139 cows, 692 calves, 272 bulls, 38 yearling cows, 59 yearling bulls; 12 unsexed adults and 12 unsexed yearlings. The observed percent calves was 31.1% in the Itcha-Ilgachuz Herd and 33.3% in the Rainbow Herd. No significant differences in elevation use were observed among adult cows, cows with calves, yearling cows or unsexed yearlings. There were also no significant differences among adult bulls, yearling bulls and unclassified adults; however elevation use by the male caribou groups was significantly different from that used by the female caribou groups. The 2000 rut survey on October 31 and November 1 observed 731 caribou; 398 cows, 130 calves, 52 mature bulls, 68 immature bulls and 83 unclassified caribou. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were 33/100 and 32/100, respectively. In the Rainbow Herd the observed calf/100 cow ratio was 31/100 and the bull/100 cow ratio was 23/100. The late winter survey on March 15 observed 529 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 15.3% and the Rainbow calf percentage was estimated at 16.7%. The Itcha- Ilgachuz Herd appears to be stable to increasing, with adequate calf recruitment and an increasing bull to cow ratio: the estimated population is 2000 caribou with a density of 0.20 caribou/km2. The Rainbow Mountains Herd showed greater calf recruitment numbers and a relatively high bull to cow ratio compared to recent years: the estimated population was 125 animals at a density of 0.028 caribou/km2. Further studies coupled with population modelling will be necessary.
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wsi_5955_rpt_2000-2001.pdf
(4.3 MB)
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Summary of the 2000 Post Calving and Rut Surveys and the 2001 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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2001
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As part of ongoing monitoring, the Itcha-Ilgachuz and Rainbow Mountains caribou herds were surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on June 20, 21 and 22, 2000 observed a total of 2224 caribou; 1139 cows, 692 calves, 272 bulls, 38 yearling cows, 59 yearling bulls; 12 unsexed adults and 12 unsexed yearlings. The observed percent calves was 31.1% in the Itcha-Ilgachuz Herd and 33.3% in the Rainbow Herd. No significant differences in elevation use were observed among adult cows, cows with calves, yearling cows or unsexed yearlings. There were also no significant differences among adult bulls, yearling bulls and unclassified adults; however elevation use by the male caribou groups was significantly different from that used by the female caribou groups. The 2000 rut survey on October 31 and November 1 observed 731 caribou; 398 cows, 130 calves, 52 mature bulls, 68 immature bulls and 83 unclassified caribou. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were 33/100 and 32/100, respectively. In the Rainbow Herd the observed calf/100 cow ratio was 31/100 and the bull/100 cow ratio was 23/100. The late winter survey on March 15 observed 529 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 15.3% and the Rainbow calf percentage was estimated at 16.7%. The Itcha- Ilgachuz Herd appears to be stable to increasing, with adequate calf recruitment and an increasing bull to cow ratio: the estimated population is 2000 caribou with a density of 0.20 caribou/km2. The Rainbow Mountains Herd showed greater calf recruitment numbers and a relatively high bull to cow ratio compared to recent years: the estimated population was 125 animals at a density of 0.028 caribou/km2. Further studies coupled with population modelling will be necessary.
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wsi_5955_rpt_2000-2001.pdf
(4.3 MB)
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Summary of the 2000 Post Calving and Rut Surveys and the 2001 Late Winter Survey for the Itcha, Ilgachuz and Rainbow Mountains
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2001
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As part of ongoing monitoring, the Itcha-Ilgachuz and Rainbow Mountains caribou herds were surveyed aerially three times in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on June 20, 21 and 22, 2000 observed a total of 2224 caribou; 1139 cows, 692 calves, 272 bulls, 38 yearling cows, 59 yearling bulls; 12 unsexed adults and 12 unsexed yearlings. The observed percent calves was 31.1% in the Itcha-Ilgachuz Herd and 33.3% in the Rainbow Herd. No significant differences in elevation use were observed among adult cows, cows with calves, yearling cows or unsexed yearlings. There were also no significant differences among adult bulls, yearling bulls and unclassified adults; however elevation use by the male caribou groups was significantly different from that used by the female caribou groups. The 2000 rut survey on October 31 and November 1 observed 731 caribou; 398 cows, 130 calves, 52 mature bulls, 68 immature bulls and 83 unclassified caribou. The observed calves/100 cows and bulls/100 cows in the Itcha-Ilgachuz Herd were 33/100 and 32/100, respectively. In the Rainbow Herd the observed calf/100 cow ratio was 31/100 and the bull/100 cow ratio was 23/100. The late winter survey on March 15 observed 529 caribou, all of which were in forest habitats. The Itcha-Ilgachuz Herd calf percentage was estimated at 15.3% and the Rainbow calf percentage was estimated at 16.7%. The Itcha- Ilgachuz Herd appears to be stable to increasing, with adequate calf recruitment and an increasing bull to cow ratio: the estimated population is 2000 caribou with a density of 0.20 caribou/km2. The Rainbow Mountains Herd showed greater calf recruitment numbers and a relatively high bull to cow ratio compared to recent years: the estimated population was 125 animals at a density of 0.028 caribou/km2. Further studies coupled with population modelling will be necessary.
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wsi_5955_rpt_2000-2001.pdf
(4.3 MB)
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Summary of the 2002 Post Calving Survey for the Itcha Ilgachuz Caribou Herd, Cariboo Region
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2002
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As part of ongoing monitoring, the Itcha-Ilgachuz Mountains caribou herd was surveyed aerially in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on June 20 and 21, 2002 observed a total of 2862 caribou; 1344 cows, 743 calves, 629 bulls, 12 yearling cows, 30 yearling bulls, 26 unsexed adults and 78 unsexed yearlings. The observed percent calves was 26.0% in the Itcha-Ilgachuz Herd. The Itcha-Ilgachuz Herd appears to have a long term increasing trend, with adequate calf recruitment and an increasing bull to cow ratio: the estimated post-season population is 2500 caribou with a density of 0.25 caribou/km2. Periodic monitoring coupled with population modelling will be necessary to confidently implement a long-term caribou strategy as required by the Cariboo-Chilcotin Land Use Plan (CCLUP).
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wsi_5955_rpt_2002PostCalving.pdf
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2003 Late Winter Survey of the Itcha-Ilgachuz, Rainbow and Charlotte Alplands Caribou Herds
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2003
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Woodland caribou (Rangifer tarandus caribou) populations in the West Chilcotin were censused in March of 2003. The census focused on locating groups of caribou containing radio-collared animals from each herd, with the objective of obtaining calf recruitment estimates from a portion of each herd. Fixed wing reconnaissance flights on February 18 and March 7, 2003 determined the general distribution of radio-collared caribou within each herd and open alpine areas used in some winters by caribou were searched for animal presence. During most of the census the helicopter flight path was dictated by the distribution of radio-collared caribou. Groups of caribou encountered while travelling between radio-collared groups were also classified. Several alpine ridges within the Charlotte Alplands were also searched for caribou presence, based on observed use in previous winters.
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wsi_5955_rpt_2003LateWinter.pdf
(14 KB)
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Summary of the 2003 Post Calving Survey for the Itcha Ilgachuz Caribou Herd, Cariboo Region
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2003
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As part of ongoing monitoring, the Itcha-Ilgachuz Mountains caribou herd was surveyed aerially in an effort to determine population trends, sex ratios, and calf recruitment. The post calving survey completed on June 17 and 18, 2003 observed a total of 2861 caribou: 1106 cows, 611 calves, 717 bulls, 33 yearling cows, 71 yearling bulls, 99 unsexed yearlings, 135 unsexed adults and 89 unclassified non-calf caribou. The observed calf percentage was 21.4% in the Itcha-Ilgachuz Herd. The Itcha-Ilgachuz Herd appears to have a long term increasing trend, with adequate calf recruitment and an increasing bull to cow ratio: the estimated post-season population is 2800 caribou with a density of 0.28 caribou/km2. Periodic monitoring coupled with population modelling will be necessary to confidently implement a long-term caribou strategy as required by the Cariboo-Chilcotin Land Use Plan (CCLUP).
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wsi_5955_rpt_2003PostCalving.pdf
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Summary of the 2007 Post Calving Survey for the Itcha Ilgachuz Caribou Herd, Cariboo Region
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2007
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On June 18th and 19th, 2007 the Itcha-Ilgachuz Mountains caribou herd was aerially surveyed in an effort to determine population status and calf recruitment. During this post calving survey a total of 1784 caribou were observed; including 1021 cows, 432 calves, 237 bulls, 90 yearlings and 4 unclassified adult caribou. The calves represented 24% of the population or 42.3 calves/100 cows. The bull ratio was observed at 23.2 bulls/100 cows, substantially lower than the minimum provincial target of 35bulls/100 cows. The yearling component of the population also appeared low, represented by 7.1 yearlings/100 adult caribou. Higher than average snow accumulation over the previous winter delayed green-up of the inventoried high elevation areas. This delayed availability of forage likely resulted in the decreased sightability of both adult and yearling bulls.
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wsi_5955_rpt_2007PostCalvingSummary.pdf
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Summary of the 2008 Rut Survey For The Rainbow Mountains Caribou Herd
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2009
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The Rainbow Mountains caribou herd was surveyed aerially in October 2008 in an effort to assess population size, bull-cow ratios, calf percentage, and population trend. The 2008 rut survey observed a total of 44 caribou: 24 cows, 6 calves and 14 bulls. Calves represented 13.6% of total observed caribou, the calf/100 cow ratio was 25/100 and the bull/100 cow ratio was 58/100.
The Rainbow Mountains herd has declined since the mid 1990s and appears to have experienced a rapid decline since 2000. The 2008 population has been estimated at 50 caribou.
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wsi_5955_rpt_2008.pdf
(120 KB)
|
|
Itcha Ilgachuz Caribou Herd: Late Winter Recruitment Survey - 2010
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2010
|
We flew on March 9, 2010 for 6.8 hours (4.8 of actual survey) with Highland Helicopters. We were unable to locate any caribou. Zero.
We covered the known winter range, based on historical surveys and saw old tracks that were very melted out. We did not see any fresh caribou tracks. We also flew over an area where caribou are not usually located, but sightings have been trickling in from locals (anecdotal only); we saw lots of tracks, but were unable to identify the species. It was difficult to differentiate caribou track from moose, cattle, or horse due to the melted state of the tracks and lack of recent snow in the past few weeks. While looking for caribou in dog-hair pine is like finding a needle in a haystack, I would have thought we would have seen at least one caribou.
We can say that the caribou appear to be doing things differently in the past couple of years, as recent surveys (i.e. post-calving) are 'atypical' compared to historic surveys from the 1990 and early 2000s. It is possible that the warm winter has resulted in snow conditions that are unfavourable for cratering, such that the melt-and-thaw has created a hard crust that caribou have difficulty breaking through to access terrestrial lichen. We thought the caribou may have moved to areas where they could feed on arboreal lichen, however our recce flight into those areas did not show any fresh sign either. In hindsight, we wish we had landed the helicopter to see how hard the snow was, and whether any tracks were visible on the snow crust...but we didn't. Regardless of this, we still would not have been able to locate any caribou from the air if tracks were invisible to us. In the amount of flight time we had available, we covered a lot of ground. Survey map of flight route overlaid with winter range and habitat suitability mapping needs to be completed and filed.
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wsi_5955_rpt_2010.pdf
(172 KB)
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Population Status and Trends From the 2009 Post Calving Survey for the Itcha Ilgachuz Caribo Herd
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2010
|
As part of ongoing monitoring, the Itcha-Ilgachuz northern caribou herd was surveyed aerially in June 2009. Objectives of the survey were to i) obtain a total count with classification and ii) assess current population status and trends of the Itcha-Ilgachuz caribou herd.
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wsi_5955_rpt_2009.pdf
(181 KB)
|
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Wildlife Species Inventory Data Summary - 2010 Itcha Ilgachuz Post Calving Summary Report
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2010
|
Project objective: Determine population trends, sex ratio, and calf recruitment to inform management and harvest decisions.
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wsi_5955_rpt_2010PostCalving.pdf
(322 KB)
|
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Itcha Ilgachuz Northern Caribou Population Estimate: June 2012 Survey
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2012
|
This report presents a population estimate for the Itcha-Ilgachuz northern caribou population of west-central British Columbia. The estimate is based on data collected during an aerial survey conducted in June 2012.
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wsi_5955_rpt_2012.pdf
(138 KB)
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Itcha-Ilgachuz Northern Caribou Recruitment Survey: March 2013
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2013
|
Annual report (Davis, 2013): This report summarizes the results of calf recruitments surveys conducted for the Itcha-Ilgachuz northern caribou population in west- central British Columbia. The summary is based on data collected during aerial surveys in March 2013. Fixed-wing flights were completed over 3 days (17 hours flight time) in mid-March (17, 18, and 22nd). Weather conditions were unstable during mid-March (mixed sun/cloud/periods of snow showers) resulting in the first day being cut short and the second day being delayed for several hours by unacceptable flying weather, while day 3 had clear weather. (Note: some data included in the report has been updated - refer to database for specific results)
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wsi_5955_rpt_2012-2015.pdf
(571 KB)
|
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Itcha-Ilgachuz Seasonal Caribou Calf Survival Inventory 2013
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2013
|
This flight was a continuation of the calf survival flight conducted in 2012. Conditions were ideal. Radio signals were assessed to determine which radios were still active.
The Itcha-Ilgachuz caribou population has declined approximately 52% between 2003 and 2010. Although there are a range of cumulative effects, the precise cause is unclear.
Mining, logging, roads, mountain pine beetle and fire may reduce habitat quality and quantity through the medium and long term, while wolf predation may act through the short and medium term. Cause and effect changes through habitat supply are more difficult to assess, while population changes through wolf predation may be more obvious.
OBJECTIVES
The purpose of the present survey was to assess population parameters and change between years 2012 - 2013, through the calf component. In the past few years, few seasonal calf indices have been obtained.
|
wsi_5955_rpt_2013.pdf
(352 KB)
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Itcha Ilgachuz Northern Caribou Late Winter Recruitment Survey, March 2012
|
2014
|
Aerial inventory of the Itcha-Ilgachuz northern caribou herd was conducted in March 2012 to obtain an annual calf recruitment estimate.
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wsi_5955_rpt_2012-215SummaryReport2012.pdf
(339 KB)
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Itcha-Ilgachuz Northern Caribou Late Winter Recruitment Survey, March 2014
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2014
|
Aerial inventory of the Itcha-Ilgachuz northern caribou herd was conducted in March 2014 to obtain an annual calf recruitment estimate.
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wsi_5955_rpt_2012-2015Summary2014.pdf
(724 KB)
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Review of the 2012 Itcha Ilgachuz Northern Caribou Population Estimate
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2014
|
In response to inquiries regarding the Itcha-Ilgachuz caribou population status, I reviewed the survey estimates and population estimate put forth by Wilson (2012). In doing so, some discrepancies in the methods reportedly used to calculate the estimates came to light. The following text is the documentation associated with deciphering how the survey estimates, population estimate and associated confidence intervals were calculated. This exercise was intended to provide consistency in calculating and reporting survey and population estimates for both the 2012 and 2014 caribou population surveys.
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wsi_5955_rpt_2012Review.pdf
(712 KB)
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Population Status of the Itcha-Ilgachuz Northern Caribou Herd, 2014-2015
|
2017
|
The Itcha-Ilgachuz northern caribou herd was surveyed in June 2014 to assess population trends, sex ratios, and early calf recruitment. A radio-collaring program implemented in 2011 provided a collared sample of both adult female (n=19) and male caribou (n=11) for mark-resight population estimation; at the time of the survey 17 collared cows and 6 collared bulls were within the defined survey area. The 2014 post-calving survey resulted in a survey count of 685 caribou: 399 cows, 226 calves, 46 bulls, 12 yearling, and 2 unsexed adults. This was the lowest caribou count during a post-calving survey since the early 1980s. An additional 266 caribou (106 cows, 53 calves, 99 bulls, and 8 yearlings) were observed post-survey, resulting in a minimum count of 951 caribou. Calves represented 33.0% of the total survey count with 56.6 calves: 100 cows; for the 19 collared cows, a ratio of 61.2 calves: 100 cows was observed. Bull ratio using minimum count data was 28.7 bulls: 100 cows. Survey estimate for adult cows was 753 (535-1319) and adult males was 137 (66-696). The 2014 population estimate for the Itcha-Ilgachuz herd is 1350 caribou. The long-term population trend is stable (1994-2014) with change in population size of -11.1%. Although the 20 year trend suggests stability, this does not accurately represent the variability observed in caribou numbers. The Itcha-Ilgachuz caribou herd experienced population growth in the late 1990s and early 2000s with the population increasing from approximately 1500 animals to 2800 between 1995 and 2003. Since then, numbers have steadily declined and the population appears to be similar in size to that of the early 1990s. Change in estimated population size over the past 10 years has averaged -6.4% per annum, consequently the short term population trend is decreasing (2003-2014) with an overall change in population size of 51.8%. The current trend of surveys done in 2012 and 2014 is down with a change in caribou numbers of -15.6%.
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wsi_5955_rpt_2014PostCalving.pdf
(938 KB)
|
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Itcha-Ilgachuz and Rainbow Caribou Population and Habitat Information 2018
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2018
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The Itcha-Ilgachuz and Rainbows woodland caribou (Rangifer tarandus) herds are located on the Cariboo-Chilcotin plateau in west-central British Columbia. They are part of the southern mountain caribou population. Both caribou herds are declining, and the disturbance levels in each herds critical habitat is over federally recommended thresholds. This document provides details on the population trends, habitat conditions and habitat use for each herd.
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wsi_5955_rpt_2018.pdf
(848 KB)
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2019 Itcha-Ilgachuz caribou post-calving population survey
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2019
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Annual report (Shores, 2019): The 2019 Itcha-Ilgachuz survey was flown June 19th - 21st to assess population status and June calf percentages. The herd has declined by 40% in one year (2018-19). Given the 3-year average rate of decline (-33.4 %, 2017-19), it is possible the herd will be functionally extirpated (< 20 animals) from the Chilcotin in 8 years. 185 total caribou were observed during the survey. This is the lowest number of Itcha-Ilgachuz caribou recorded since post-calving surveys for the herd began in the 1970s. An additional 24 caribou were sighted during follow-up surveys of collared caribou. This resulted in a total minimum count of 209 caribou (66 cows, 58 bulls, 64 unclassified adults, 3 yearlings and 18 calves).
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wsi_5955_rpt_2018-2019.pdf
(1.7 MB)
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Population Status for the Chilcotin Complex Caribou Herds, Cariboo Region, 2020
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2020
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Annual report (Cornhill, 2020): In June 2020 the Itcha-Ilgachuz and Rainbows caribou herds were counted by aerial surveys. The Itcha-Ilgachuz herd had 382 individuals during the survey and 42 individuals during the follow up flights, giving a minimum count of 424 individuals. A total of 14 collars were seen out of a possible 21. This gave a population estimate of 508. Neonate recruitment was 30%. The Rainbows herd had a minimum count of 24 individuals (33% calves), a decline from the 32 individuals in 2016.
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wsi_5955_rpt_2020.pdf
(1.1 MB)
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Itcha-Ilgachuz Caribou Calf Recruitment - 2021
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2021
|
Annual report (Shores, 2021): records the results of a March 2021 recruitment survey in the Itcha-Ilgachuz caribou herd. Radio-collared caribou were relocated, classified by age and sex, and a recruitment ratio was obtained. Data update: Report records the total count of caribou as 295, corrected in the database to 298 (238 adults + 57 calves + 3 unclassified caribou).
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wsi_5955_rpt_2021.pdf
(611 KB)
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Population Status of the Chilcotin Caribou Herds - 2021
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2021
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The Itcha-Ilgachuz, Rainbows and Charlotte Alplands Northern caribou subpopulations on the Chilcotin plateau are shallow snow, terrestrial lichen eating caribou, referred to as Designatable Unit 7 by the Committee on the Status of Endangered Wildlife in Canada and classified as a species of Special Concern (COSEWIC 2014). The Itcha-Ilgachuz caribou herd declined by 80% between 2003-2019 (Shores 2019). Given the rate of decline, it was estimated in 2019 that functional extirpation (< 20 animals) was possible within the next 8 years, and wolf removal was initiated in 2020 as an emergency measure while habitat protection and restoration could be put into place. The BC Caribou Recovery Program recommends that annual population surveys are done on herds where predator removal is occurring. The objectives of the survey were to 1) obtain a minimum total count; 2) estimate population size and 3) estimate the percentage of neonates in each subpopulation.
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wsi_5955_rpt_2021Chilcotin.pdf
(669 KB)
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Itcha-Ilgachuz Caribou Calf Recruitment - 2022
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2022
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The caribou in the Itcha-Ilgachuz subpopulation on the Chilcotin plateau are shallow snow, terrestrial lichen eating caribou, referred to as Designatable Unit 7 by the Committee on the Status of Endangered Wildlife in Canada and classified as a species of Special Concern (COSEWIC 2014). The Itcha-Ilgachuz caribou herd declined by 80% between 2003-2019 (Shores 2019). Given the rate of decline, it was estimated in 2019 that functional extirpation (<20 animals) was possible within the next 8 years, and wolf removal was initiated in 2020 as an emergency measure while habitat protection and restoration plans were initiated. The March 2022 recruitment survey was flown to estimate overwinter calf survival, which indicates survival of calves to reproductive age.
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wsi_5955_rpt_2022.pdf
(301 KB)
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Itcha-Ilgachuz June Population Survey 2023
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2023
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The Itcha-Ilgachuz caribou herd experienced a rapid population decline of 80% between 2003 and 2019 (Shores 2019). In response to this population decline, a wolf reduction program was initiated in 2020 to recover the Itcha-Ilgachuz caribou population. After initial population increases in 2020 and 2021, the population estimate of 551 in 2023 was the same as the last population estimate of 550 in 2021 (lambda=1.004). Neonate percentage and calf recruitment have increased following wolf removal. Neonate percentage was at a low of 10% in 2018 and has increased back up to its expected range (20-30%). Calf recruitment in the 2023 late-winter recruitment survey was very high at 24.2%. Coupled with a high adult survival rate of 85%, population metrics have been improving overall following the wolf removal program. The population estimate plateau between 2021 and 2023 highlights the importance of continued monitoring. It also underlines that habitat protection and restoration measures are the long-term and ultimate solution to Itcha-Ilgachuz caribou herd recovery.
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wsi_5955_rpt_2023PC.pdf
(705 KB)
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Itcha-Ilgachuz Late Winter Recruitment Survey 2023
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2023
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The Itcha-Ilgachuz caribou herd experienced a rapid population decline of 80% between 2003 and 2019 (Shores 2019). In response to this population decline, a wolf reduction program was initiated in 2020 to recover the Itcha-Ilgachuz caribou population. Late-winter recruitment surveys provide a measure of calf survival to reproductive age, as well as a population response to the wolf reduction program. High calf percentages during late-winter recruitment surveys appear to be responsive to the wolf reduction program, with a 2023 calf percentage of 24.2%, which is the highest that's been recorded in the Itcha-Ilgachuz herd since the 1980's. These results highlight the effectiveness of the wolf reduction program as a short-term recovery measure. The strong year-to-year variation in recruitment correlating with number of wolves removed emphasizes that habitat protection and restoration measures are the long-term and ultimate solution to caribou recovery.
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wsi_5955_rpt_2023LW.pdf
(942 KB)
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| Field Data |
Publish Year |
Description |
Filename |
|
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Point data for the 1967-1977 survey formatted for entry into SPI
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wsi_5955_dct_1967-1977.xlsm
(251 KB)
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Point data for the 1973-1975 survey formatted for entry into SPI
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wsi_5955_dct_1973-1975.xlsm
(245 KB)
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Point data for the 1973-1988 survey formatted for entry into SPI
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wsi_5955_dct_1973-1988.xlsm
(252 KB)
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Point data for the 1974-1977 survey formatted for entry into SPI
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wsi_5955_dct_1974-1977.xlsm
(246 KB)
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Point data for the 1978-1984 survey formatted for entry into SPI
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wsi_5955_dct_1978-1984.xlsm
(249 KB)
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Point data for the 1978-1987 survey formatted for entry into SPI
|
wsi_5955_dct_1978-1987.xlsm
(253 KB)
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Point data for the 1985-1988 survey formatted for entry into SPI
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wsi_5955_dct_1985-1988.xlsm
(259 KB)
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Point data for the 1986-1987 survey formatted for entry into SPI
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wsi_5955_dct_1986-1987.xlsm
(244 KB)
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Point data for the 1988-1992 survey formatted for entry into SPI
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wsi_5955_dct_1988-1992.xlsm
(251 KB)
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Point data for the 1994-1995 survey formatted for entry into SPI
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wsi_5955_dct_1994-1995.xlsm
(265 KB)
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Point data for the 1994-2001 Aerial Rut Composition survey formatted for entry into SPI
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wsi_5955_dct_1994-2001.xlsm
(277 KB)
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Point data for the 1995-2001 Aerial Rut Population Count & Composition survey formatted for entry into SPI
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wsi_5955_dct_1995-2001.xlsm
(252 KB)
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Point data for the 1996-2003 Post-Calving Population Count & Recruitment-MRR survey formatted for entry into SPI
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wsi_5955_dct_1996-2003.xlsm
(340 KB)
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Point data for the 1996-2004 Aerial Late Winter Recruitment survey formatted for entry into SPI
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wsi_5955_dct_1996-2004.xlsm
(276 KB)
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Point data for the 2007 Aerial Rut Composition survey formatted for entry into SPI
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wsi_5955_dct_2007.xlsm
(250 KB)
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Point data for the 2007-2008 Aerial Rut Population Count & Compositionsurvey formatted for entry into SPI
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wsi_5955_dct_2007-2008.xlsm
(243 KB)
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Point data for the 2007-2010 Aerial Post-Calving Population Count & Recruitment survey formatted for entry into SPI
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wsi_5955_dct_2007-2010.xlsm
(284 KB)
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Point data for the 2010 Aerial Late Winter Recruitment survey formatted for entry into SPI
|
wsi_5955_dct_2010.xlsm
(243 KB)
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Point data for the 2012 Aerial Post-Calving Population Count & Recruitment-MRR survey formatted for entry into SPI
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wsi_5955_dct_2012.xlsm
(256 KB)
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Point data for the 2012-2015 Aerial Late Winter Recruitment survey formatted for entry into SPI
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wsi_5955_dct_2012-2015.xlsm
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Point data for the 2013 survey formatted for entry into SPI
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wsi_5955_dct_2013.xlsm
(233 KB)
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Point data for the 2014 Aerial Post-Calving Population Count & Recruitment-MRR survey formatted for entry into SPI
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wsi_5955_dct_2014Calving.xlsm
(255 KB)
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Point data for the 2014 Aerial Rut Composition survey formatted for entry into SPI
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wsi_5955_dct_2014Rut.xlsm
(248 KB)
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Point data for the 2016 Rainbows Aerial Rut Population Count & Composition survey formatted for entry into SPI
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wsi_5955_dct_2016.xlsm
(244 KB)
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Point data for the 2017 Aerial Post-Calving Population Count & Recruitment survey formatted for entry into SPI
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wsi_5955_dct_2017.xlsm
(250 KB)
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Point data for the 2017-2022 Animal Marks dataset formatted for entry into SPI
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wsi_5955_dct_2017-2022Marks.xlsm
(255 KB)
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Point data for the 2018-2019 Aerial Post-Calving Population Count & Recruitment-MRR survey formatted for entry into SPI
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wsi_5955_dct_2018-2019.xlsm
(255 KB)
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Point data for the 2020 Aerial Post-Calving Population Count & Recruitment-MRR survey formatted for entry into SPI
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wsi_5955_dct_2020.xlsm
(249 KB)
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Point data for the 2021 Aerial Late Winter Recruitment survey formatted for entry into SPI
|
wsi_5955_dct_2021.xlsm
(257 KB)
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Point data for the 2021 Aerial Post-Calving Population Count & Recruitment survey formatted for entry into SPI
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wsi_5955_dct_2021PostCalving.xlsm
(210 KB)
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Point data for the 2021 Aerial Post-Calving Population Count & Recruitment survey in original format
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wsi_5955_org_2021PostCalving.zip
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Point data for the 2022 Aerial Late Winter Recruitment survey formatted for entry into SPI
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wsi_5955_dct_2022.xlsx
(128 KB)
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Point data for the 2023 Post-Calving Population Count survey formatted for entry into SPI
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wsi_5955_dct_2023PC.xlsm
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Point data for the 2023 Winter Recruitment survey formatted for entry into SPI
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wsi_5955_dct_2023LW.xlsm
|
| Map |
Publish Year |
Description |
Filename |
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Post Calving Census Map 1992
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1992
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1992 - Itcha Ilgachuz - Post Calving Census Map
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wsi_5955_rpt_1992PostCalvingMap.pdf
(39.3 MB)
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Caribou Survey Flightlines for Itcha Ilgachuz, June 1994
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1994
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1994 - Itcha Ilgachuz - Post Calving Census Map
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wsi_5955_rpt_1994PostCalvingMap.pdf
(34 MB)
|
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Caribou Survey Flightlines for Itcha Ilgachuz, October 1994
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1994
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1994 - Itcha Ilgachuz - Rut Census Map
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wsi_5955_rpt_1994RutMap.pdf
(37.1 MB)
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Caribou Survey Flightlines for Itcha Ilgachuz, June 1995
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1995
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1995 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
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wsi_5955_rpt_1995PostCalvingMap.pdf
(39.9 MB)
|
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Rut Census Map 1995
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1995
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1995 - Itcha Ilgachuz-Rainbows - Rut Census Map
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wsi_5955_rpt_1995RutMap.pdf
(40.7 MB)
|
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Rut Census Map 1995
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1995
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1995 - Itcha Ilgachuz-Rainbows - Rut Census Map
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wsi_5955_rpt_1995RutMap.pdf
(40.7 MB)
|
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Caribou Survey Flight Lines for Itcha-Ilgachuz
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1996
|
1996 - Itcha Ilgachuz-Rainbows - Late Winter Census Map
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wsi_5955_rpt_1996Map.pdf
(37.4 MB)
|
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Caribou Survey Flightlines for Itcha Ilgachuz, June 1996
|
1996
|
1996 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
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wsi_5955_rpt_1996PostCalvingMap.pdf
(35 MB)
|
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Caribou Survey Flightlines for Itcha Ilgachuz, October 1996
|
1996
|
1996 - Itcha Ilgachuz-Rainbows - Rut Census Map
|
wsi_5955_rpt_1996RutCensusMap.pdf
(31.5 MB)
|
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Caribou Survey Flightlines for Itcha Ilgachuz, October 1996
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1996
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1996 - Itcha Ilgachuz-Rainbows - Rut Census Map
|
wsi_5955_rpt_1996RutCensusMap.pdf
(31.5 MB)
|
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Caribou Survey Flight Lines for Itcha-Ilgachuz
|
1997
|
1997 - Itcha Ilgachuz-Rainbows - Late Winter Census Map
|
wsi_5955_rpt_1997Map.pdf
|
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Caribou Survey Flightlines for Itcha Ilgachuz, June 1997
|
1997
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1997 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
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wsi_5955_rpt_1997PostCalvingMap.pdf
(33.7 MB)
|
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Caribou Survey Flightlines for Itcha Ilgachuz, October 1997
|
1997
|
1997 - Itcha Ilgachuz-Rainbows - Rut Census Map
|
wsi_5955_rpt_1997RutCensusMap.pdf
(31.3 MB)
|
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Caribou Survey Flightlines for Itcha Ilgachuz, October 1997
|
1997
|
1997 - Itcha Ilgachuz-Rainbows - Rut Census Map
|
wsi_5955_rpt_1997RutCensusMap.pdf
(31.3 MB)
|
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Caribou Survey Flight Lines for Itcha-Ilgachuz
|
1998
|
1998 - Itcha Ilgachuz-Rainbows - Late Winter Census Map
|
wsi_5955_rpt_1998Map.pdf
(35.6 MB)
|
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Caribou Survey Flightlines for Itcha Ilgachuz, June 1998
|
1998
|
1998 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
|
wsi_5955_rpt_1998PostCalvingMap.pdf
|
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Western Caribou Flight Post-Rut Survey, October 1998
|
1998
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1998 - Itcha Ilgachuz-Rainbows-Charlotte Alplands - Rut Census Map
|
wsi_5955_rpt_1998RutCensusMap.pdf
(37.3 MB)
|
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Western Caribou Flight Post-Rut Survey, October 1998
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1998
|
1998 - Itcha Ilgachuz-Rainbows-Charlotte Alplands - Rut Census Map
|
wsi_5955_rpt_1998RutCensusMap.pdf
(37.3 MB)
|
|
October 1999 - Rut Survey Rainbows and Itcha Ilgachuz
|
1999
|
1999 - Itcha Ilgachuz-Rainbows - Rut Census Map
|
wsi_5955_rpt_1999RutCensusMap.pdf
(29.8 MB)
|
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October 1999 - Rut Survey Rainbows and Itcha Ilgachuz
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1999
|
1999 - Itcha Ilgachuz-Rainbows - Rut Census Map
|
wsi_5955_rpt_1999RutCensusMap.pdf
|
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Western Caribou Survey, July 1999
|
1999
|
1999 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
|
wsi_5955_rpt_1999PostCalvingMap.pdf
|
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Western Caribou Winter Survey - March 1999
|
1999
|
1999 - Itcha Ilgachuz-Rainbows - Late Winter Census Map
|
wsi_5955_rpt_1999Map.pdf
(24.6 MB)
|
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October 2000 - Rut Survey Rainbows and Itcha Ilgachuz
|
2000
|
2000 - Itcha Ilgachuz-Rainbows - Rut Census Map
|
wsi_5955_rpt_2000RutCensusMap.pdf
|
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October 2000 - Rut Survey Rainbows and Itcha Ilgachuz
|
2000
|
2000 - Itcha Ilgachuz-Rainbows - Rut Census Map
|
wsi_5955_rpt_2000RutCensusMap.pdf
(33.2 MB)
|
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Western Caribou Late Winter Survey - March 2000
|
2000
|
2000 - Itcha Ilgachuz-Rainbows - Late Winter Census Map
|
wsi_5955_rpt_2000Map.pdf
(23.7 MB)
|
|
Western Caribou Summer Survey, June 2000
|
2000
|
2000 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
|
wsi_5955_rpt_2000PostCalvingMap.pdf
|
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October 2001 - Rut Survey Rainbows and Itcha Ilgachuz
|
2001
|
2001 - Itcha Ilgachuz-Rainbows - Rut Census Map
|
wsi_5955_rpt_2001RutCensusMap.pdf
(42.4 MB)
|
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October 2001 - Rut Survey Rainbows and Itcha Ilgachuz
|
2001
|
2001 - Itcha Ilgachuz-Rainbows - Rut Census Map
|
wsi_5955_rpt_2001RutCensusMap.pdf
|
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Western Caribou Late Winter Survey - March 2001
|
2001
|
2001 - Itcha Ilgachuz-Rainbows - Late Winter Census Map
|
wsi_5955_rpt_2001Map.pdf
(24.3 MB)
|
|
Western Caribou Summer Survey, June 2001
|
2001
|
2001 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
|
wsi_5955_rpt_2001PostCalvingMap.pdf
|
|
Western Caribou Late Winter Survey - March 2002
|
2002
|
2002 - Itcha Ilgachuz-Rainbows-Charlotte Alplands - Late Winter Census Map
|
wsi_5955_rpt_2002Map.pdf
(26.7 MB)
|
|
Western Caribou Late Winter Survey - March 2003
|
2003
|
2003 - Itcha Ilgachuz-Rainbows-Charlotte Alplands - Late Winter Census Map
|
wsi_5955_rpt_2003Map.pdf
(31.4 MB)
|
|
Western Caribou Post Calving Survey, June 2003
|
2003
|
2003 - Itcha Ilgachuz - Post Calving Census Map
|
wsi_5955_rpt_2003PostCalvingMap.pdf
|
|
Caribou Observations during the 2007 Post Calving Survey for the Itcha Ilgachuz Mountains Northern Caribou Herd
|
2007
|
2007 - Itcha Ilgachuz - Post Calving Census Map
|
wsi_5955_rpt_2007Map.pdf
(18.4 MB)
|
|
Survey Map Grid #1 Itcha Meadows Caribou Surveys
|
2007
|
P10_006_cari_inv_west_50Kmap1_ItchaMows
|
wsi_5955_rpt_2007Map1.pdf
(9.7 MB)
|
|
Survey Map Grid #2 Itcha Mountains Caribou Surveys
|
2007
|
P10_006_cari_inv_west_50Kmap2_IlgachuzMtns
|
wsi_5955_rpt_2007Map2.pdf
(9.4 MB)
|
|
Survey Map Grid #3 Ilgachuz Mountains Caribou Surveys
|
2007
|
P10_006_cari_inv_west_50Kmap3_IlgachuzMtns
|
wsi_5955_rpt_2007Map3.pdf
(8.8 MB)
|
|
Survey Map Grid #4 Arc-luck Mtns, Palmer Creek Caribou Surveys
|
2007
|
P10_006_cari_inv_west_50Kmap4_Arc-Luck-Palmer
|
wsi_5955_rpt_2007Map4.pdf
(8.4 MB)
|
|
Survey Map Grid #5 Punkutlaenkut-Jorgenson Creeks Caribou Surveys
|
2007
|
P10_006_cari_inv_west_50Kmap5_Punkutlaenkut-Jorg
|
wsi_5955_rpt_2007Map5.pdf
(8.9 MB)
|
|
Survey Map Grid #6 Anahim-Nimpo Lake Caribou Surveys
|
2007
|
P10_006_cari_inv_west_50Kmap6_Anahim-Nimpo
|
wsi_5955_rpt_2007Map6.pdf
(8.9 MB)
|
|
Survey Map Grid #7 Coglisko, north of Itcha Meadows Caribou Surveys
|
2007
|
P10_006_cari_inv_west_50Kmap7_Coglisko
|
wsi_5955_rpt_2007Map7.pdf
(38 MB)
|
|
Survey Map Grid #8 Toil-Thunder Mountain Caribou Surveys
|
2007
|
P10_006_cari_inv_west_50Kmap8_Toil_ThunderMtn
|
wsi_5955_rpt_2007Map8.pdf
(15.1 MB)
|
|
Survey Map Grid #9 Chezacut Caribou Surveys
|
2007
|
P10_006_cari_inv_west_50Kmap9_Chezacut
|
wsi_5955_rpt_2007Map9.pdf
(16 MB)
|
|
2008 Rut Census Map
|
2008
|
2008 - Rainbows - Rut Census Map
|
wsi_5955_rpt_2008Map.pdf
(21 MB)
|
|
Itcha-Ilgachuz Mountains: Caribou Survey
|
2009
|
2009 - Itcha Ilgachuz - Post Calving Census Map
|
wsi_5955_rpt_2009Map.pdf
|
|
Itcha-Ilgachuz Mountains 2010 post-calving caribou survey
|
2010
|
2010 - Itcha Ilgachuz - Post Calving Census Map
|
wsi_5955_rpt_2010Map.pdf
|
|
June 2012 Itcha Ilgachuz Caribou Post-Calving Survey: Caribou Observations, and Survey Flight Route
|
2012
|
2012 - Itcha Ilgachuz - Post Calving Census - 2009 and 2012 Track Comparison Map
|
wsi_5955_rpt_2009and2012Map.pdf
(451 KB)
|
|
June 2012 Itcha Ilgachuz Caribou Post-Calving Survey: Caribou Observations, and Survey Flight Route.
|
2012
|
2012 - Itcha Ilgachuz - Post Calving Census - 2010 and 2012 Track Comparison Map
|
wsi_5955_rpt_2010and2012Map.pdf
(461 KB)
|
|
June 2012 Itcha Ilgachuz Caribou Post-Calving Survey: Caribou Observations, and Survey Flight Route.
|
2012
|
2012 - Itcha Ilgachuz - Post Calving Census Map
|
wsi_5955_rpt_2012Map.pdf
(425 KB)
|
|
Rainbow Herd Caribou Locations from September 2022-2023
|
2023
|
Rainbow Herd Caribou Locations from September 2022-2023 month by month.
|
wsi_5955_img_2022-2023Rainbow.jpeg
|
| GIS Spatial File |
Publish Year |
Description |
Filename |
|
|
|
Spatial boundaries of the Itcha-Ilgachuz and Rainbows study areas
|
wsi_5955_spp_ItchaIlgachuzRainbows.zip
(446 KB)
|
|
|
|
Spatial lines of the 2003 Post-Calving Population Count & Recruitment-MRR Flightlines
|
wsi_5955_spl_2003.zip
(11 KB)
|
|
|
|
Spatial lines of the 2007 Flightlines
|
wsi_5955_spl_2007.zip
(16 KB)
|
|
|
|
Spatial lines of the 2007-2008 Flightlines
|
wsi_5955_spl_2007-2008.zip
(95 KB)
|
|
|
|
Spatial lines of the 2007-2010 Flightlines
|
wsi_5955_spl_2007-2010.zip
(147 KB)
|
|
|
|
Spatial lines of the 2010 Flightlines
|
wsi_5955_spl_2010.zip
(9 KB)
|
|
|
|
Spatial lines of the 2012 Itcha-Ilgachuz Aerial Post-Calving Flighlines
|
wsi_5955_spl_2012.zip
(21 KB)
|
|
|
|
Spatial lines of the 2012-2015 Itcha-Ilgachuz Aerial Late Winter Recruitment
|
wsi_5955_spl_2012-2015.zip
(95 KB)
|
|
|
|
Spatial lines of the 2014 Itcha-Ilgachuz Aerial Post-Calving Flightlines
|
wsi_5955_spl_2014PostC.zip
(58 KB)
|
|
|
|
Spatial lines of the 2014 Itcha-Ilgachuz Aerial Rut Composition Flightlines
|
wsi_5955_spl_2014Rut.zip
(33 KB)
|
|
|
|
Spatial lines of the 2016 Rainbows Aerial Rut Population Count & Composition Flightlines
|
wsi_5955_spl_2016.zip
(20 KB)
|
|
|
|
Spatial lines of the 2017 Itcha-Ilgachuz Aerial Post-Calving Population Count & Recruitment Flightlines
|
wsi_5955_spl_2017.zip
(34 KB)
|
|
|
|
Spatial lines of the 2018-2019 Itcha-Ilgachuz Aerial Post-Calving Flightlines
|
wsi_5955_spl_2018-2019.zip
(409 KB)
|
|
|
|
Spatial lines of the 2020 Aerial Post-Calving Population Count & Recruitment-MRR Flightlines
|
wsi_5955_spl_2020.zip
(87 KB)
|
|
|
|
Spatial lines of the 2021 Itcha-Ilgachuz Aerial Late Winter Recruitment Flightlines
|
wsi_5955_spl_2021.zip
(248 KB)
|
|
|
|
Spatial lines of the 2023 Late Winter Recruitment Tracklines in kml format
|
wsi_5955_spl_2023LWTrack.kml
(4.8 MB)
|
|
|
|
Spatial lines of the 2023 Post-Calving Population Count Flightlines in klm format
|
wsi_5955_spl_2023PC.kml
(137 KB)
|
|
|
|
Spatial polygons of the 2023 Late Winter Recruitment blocks in klm format
|
wsi_5955_spp_2023LW.kml
(12 KB)
|
