Eleven after-second-year Cassin's Auklets (Ptychoramphus aleuticus), 10 of them females (91%), were killed when they collided with the lighthouse at Pine Island, Queen Charlotte Strait, British Columbia, in April (3 birds) and May (2 birds) 1976, and April 1977 (6 birds). This mortality of non-breeding Cassin's Auklets, which occurred late in the breeding season, possibly involved subadults visiting the Pine Island colony or other nearby colonies in Queen Charlotte Strait. Body weights ranged from 169 to 204 g, within the range of weights recorded for Cassin's Auklets visiting breeding colonies elsewhere during these months. The female bias in this sample, albeit statistically significant, is unexplained.
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10 August 2016
Non-Breeding Female Cassin's Auklets Killed at a Lighthouse at Pine Island, British Columbia, 1976 and 1977
Spencer G Sealy,
Harry R Carter
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Northwestern Naturalist
Vol. 97 • No. 2
Autumn 2016
Vol. 97 • No. 2
Autumn 2016
alcid
British Columbia
Cassin's Auklet
female
lighthouse strikes
mortality
Pine Island