| Report |
Publish Year |
Description |
Filename |
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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 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 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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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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| Field Data |
Publish Year |
Description |
Filename |
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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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| Map |
Publish Year |
Description |
Filename |
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Caribou Survey Flightlines for Itcha Ilgachuz, June 1996
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1996
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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, June 1997
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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, June 1998
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1998
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1998 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
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wsi_5955_rpt_1998PostCalvingMap.pdf
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Western Caribou Survey, July 1999
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1999
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1999 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
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wsi_5955_rpt_1999PostCalvingMap.pdf
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Western Caribou Summer Survey, June 2000
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2000
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2000 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
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wsi_5955_rpt_2000PostCalvingMap.pdf
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Western Caribou Summer Survey, June 2001
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2001
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2001 - Itcha Ilgachuz-Rainbows - Post Calving Census Map
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wsi_5955_rpt_2001PostCalvingMap.pdf
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Western Caribou Post Calving Survey, June 2003
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2003
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2003 - Itcha Ilgachuz - Post Calving Census Map
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wsi_5955_rpt_2003PostCalvingMap.pdf
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| GIS Spatial File |
Publish Year |
Description |
Filename |
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Spatial lines of the 2003 Post-Calving Population Count & Recruitment-MRR Flightlines
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wsi_5955_spl_2003.zip
(11 KB)
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