Colony Dynamics and Persistence of Ivory Gull Breeding in Canada

Avian Conservation and Ecology

Mark L Mallory,¹  Gregory J. Robertson,²  H. Grant Gilchrist,² 

[1] Canadian Wildlife Service;Environment Canada

关键词: colony dynamics;    endangered species;    Ivory Gull;    Pagophila eburnea;    population modeling;   

DOI  :  10.5751/ACE-00172-020208

学科分类：社会科学、人文和艺术（综合）

来源: Resilience Alliance Publications

【 摘 要 】

Despite the importance of assessing the viability of small and endangered populations, often few demographic data are available. However, when counts are available from discrete sites, a colony- or site-based approach can be useful. We used recent counts of Ivory Gull, Pagophila eburnea, a rare species that breeds at remote sites in the high Arctic, to model colony dynamics and population persistence. Dramatic declines in numbers of pairs nesting in Canada led to the uplisting of this species to Endangered by the Committee on the Status of Endangered Wildlife in Canada in 2006. Colonies continued to decline from 2004 to 2006, with sites at the southern edge of the breeding range on Baffin Island almost completely extirpated; only one pair remained in 2005 and 2006. We used colony counts at 24 sites on southern Ellesmere Island and Devon Island from 2002 to 2006 to model extinction and colonization rates. Extinction rates were high at 0.735

【 授权许可】

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