Quantifying gull predation in a declining Leach’s Storm-petrel (Hydrobates leucorhous) colony

Avian Conservation and Ecology

article

Alexander L. Bond¹  Sabina I. Wilhelm²  Donald W. Pirie-Hay³  Gregory J. Robertson⁴  Ingrid L. Pollet⁵  Jillian L. Arany⁶ 

[1] Bird Group;Canadian Wildlife Service;Wildlife Research Division, Environment and Climate Change Canada, Mount Pearl, Newfoundland and Labrador;Wildlife Research Division;Acadia University;Canadian Wildlife Service, Environment and Climate Change Canada, Mount Pearl, Newfoundland and Labrador

关键词: American Herring Gulls;    Hydrobatidae;    Laridael;    Leach's Storm-Petrel;    Newfoundland;    population estimate.;    Witless Bay;   

DOI  :  10.5751/ACE-02388-180105

学科分类：口腔科学

来源: Resilience Alliance Publications

【 摘 要 】

The effect of gull predation on sympatric seabirds has garnered much attention and management action in recent decades. In Witless Bay, Newfoundland, Canada, gulls depredate significant numbers of Leach’s Storm-petrels (Hydrobates leucorhous) annually. We quantified this predation on Gull Island in Witless Bay, and its effects on the storm-petrel population, by estimating the annual gull predation rate using strip transects to count storm-petrel carcasses and predicting storm-petrels’ population growth rate by repeating an island-wide breeding census. Using methods that account for island topography, we found that the Leach’s Storm-petrel breeding population on Gull Island declined to roughly 180,000 pairs in 2012 (95% CI: 130,000–230,000), a decrease of 6% per year since the last census in 2001 (352,000 pairs). Based on carcass counts, gulls, mostly American Herring Gulls (Larus argentatus smithsonianus), depredated 118,000–143,000 Leach’s Storm-petrels in 2012. Studies of storm-petrel recruitment, the contribution of the large non-breeding component of the population to gulls’ diets, and the consequences of gulls’ storm-petrel diet on the gulls themselves are needed to better predict the trajectory of both species into the future.

【 授权许可】

CC BY