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Birds from three colonies also made frequent, long visits to uninhabited islands. fish plants and human settlement), and otherwise diverged in distribution and use of offshore and coastal areas. In contrast, birds from close colonies overlapped in visitation to specific nearby resources (e.g. Despite large distances among three colonies, birds overlapped at particular distant, inland mink farms. All four anthropogenic resource types were heavily used (56 ± 11% of visiting time across colonies), notably, fish plants and mink farms. repeated visits) and time spent in specific areas. To evaluate the spatial distribution of visits, we created a use intensity index, reflecting both fidelity (i.e. Using GPS devices on 39 gulls from four colonies, we identified visitation behaviour (slow, localized movements) and assigned visits to nine resource types. Our objectives were to 1) assess use of natural and anthropogenic habitats by herring gulls from multiple colonies, 2) evaluate variation among colonies in use of distinct resource types within these habitats and 3) highlight areas of high gull:industry interaction. In the eastern Gulf of Maine, Canada, breeding herring gulls Larus argentatus have access to resources from aquaculture, fisheries and mink farms, but the relative influence of industry on local gull populations is unknown. Opportunist gulls use anthropogenic food subsidies, which can bolster populations, but negatively influence sensitive local ecosystems and areas of human settlement. Sainte-Anne, Pointe-de-l'Église, NS, Canada. of New Brunswick, Fredericton, NB, Canada.ħS. Diamond, Atlantic Laboratory for Avian Research, Univ. Shlepr (), Dept of Biological Sciences, Florida Atlantic Univ., Boca Raton, FL, USA.ĦA. Allard (), Canadian Wildlife Service, Environment and Climate Change Canada, Sackville, NB, Canada.ĥK. Ronconi (), Canadian Wildlife Service, Environment and Climate Change Canada, Dartmouth, NS, Canada.ĤK. Studholme (), Dept of Biology, Dalhousie Univ., Halifax, NS, Canada.ģR. Mallory (), Dept of Biology, Acadia Univ., Wolfville, NS, Canada.ĢK.
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Allard, 4 Katherine Shlepr, 5 Anthony W.