This was the eighth year of systematic goshawk nest monitoring on Haida Gwaii. Monitoring included several visits to each known nest area, and if no birds were initially located, then goshawk playback surveys were conducted throughout the area, and in adjacent areas of suitable habitat, to establish if the birds were present and possibly using a new nest. All 14 of the previously known nest areas were monitored. In the early spring, during a time when courtship and nest-building is initiated, birds were present in the immediate vicinity of 60% of the nests. Later on in the season, 21% of the 14 known sites successfully fledged young. This is very close to the average breeding success rate over the past seven years of intense monitoring (23.9%) and is on the low end of the normal range found in other goshawk studies. The average number of chicks fledged per breeding attempt was 2.0, which is comparable to the seven-year Haida Gwaii average of 1.50 (SD = 0.52, N = 16). Encouragingly of the 3 nests that fledged young, 2 (Black Bear and Ian NE) have one of the lowest areas of mature-old growth forest within the predicted territory (~5 km of the nest area), indicating that under the right condition that these areas can still support breeding.
Overall, the breeding data from 2007 represents an average year for goshawks on Haida Gwaii. No new nests were found this year.
Doyle, Frank I.. 2008. Breeding Success of the goshawk (A.g. Laingi) on Haida Gwaii/Queen Charlotte Islands 2007 - March 2008. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2008MR260
Topic: FLNRORD Research Program
Keywords: Forest, Investment, Account, (FIA), British, Columbia
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