Survival rates of Cassin's and Rhinoceros Auklets at Triangle Island, British Columbia

Article Abstract:

Triangle Island, British Columbia, has large colonies of Cassin's Auklets and Rhinoceros Auklets. The first estimates of local survival on Triangle Island is reported, and differences between netting sites were tested. A two 'age'-class model was the best fit for both species, and estimates of local adult survival were much lower for Cassin's Auklet, indicating that a low survival rate and declining population are plausible.

Patient outcomes, Mortality, Observations, Ornithological research, Auks

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Colony attendance of least auklets at St. Paul Island, Alaska: implications for population monitoring

Article Abstract:

The plankton-eating Least Auklets (Aethia pusilla) have the peculiar trait of breeding in inaccessible crevices, such that their populations can only be estimated through surface counts of colony attendance. The use of surface counts may not be reliable since colony attendance may vary with oceanographic conditions, which controls the abundance of planktons. A population monitoring technique that minimizes the effect of attendance behavior is required. Color-marked populations of auklets are to be observed for long periods for their reproductive performance and survival rates.

Research, Natural history, Bird populations, Sea birds, Saint Paul Island (Alaska), Seashore ecology, Colonies (Biology), Seabirds

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Site fidelity of black brant wintering and spring staging in the Strait of Georgia, British Columbia

Article Abstract:

Fidelity to wintering and spring staging areas in the black brant, Branta bernicla nigricans, was assessed using multiple observation data garnered from Parksville-Qualicum and Boundary Bay in British Columbia. There is low site fidelity during winter and there are transients in spring. Site fidelity appears to be related to prior experience in a particular area. Further, low site fidelity will not result in the establishment of a genetic substructure within the bird population.

Waterfowl, Birds, Bird migration, Brent-goose, Brent goose

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