Geographic, temporal, and age-specific variation in diets of glaucous gulls in western Alaska

Article Abstract:

Geographic and temporal differences were noted in the diets of Glaucous Gulls of western Alaska. From collected food remains and boluses, it was found that gulls ate more terrestrial prey after peak hatch in late June while gulls that live near the coast ate more marine prey than gulls at inland areas. Similar trends of temporal and geographic variation in the diet were noted with the use of stable-carbon and nitrogen isotopes in gull and prey tissues. Dietary estimates also differed based on geographic areas and the hatching periods.

Alaska, Gulls

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Technique-dependent biases in determination of diet composition: an example with ring-billed gulls

Article Abstract:

The diet of ring-billed gulls during the nestling period were evaluated using methods of pellet regurgitation by adults and direct observations of chick provisioning. The methods exhibited substantially different diets for a single colony location. Plant material, birds and scavenged human refuse composed most pellets, while insects and fish were observed for other food remains.

Animal nutrition, Ring-billed gull

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Habitat selection and reproductive performance of food-stressed herring gulls

Article Abstract:

A new study of herring gulls in Newfoundland seeks to determine whether food availability affects breeding performance and inter-habitat differences. The prediction that food stress accentuates the success of birds nesting in preferred habitat is not substantiated by the experiment and it is shown that reproductive performance may be influenced by other factors.

Habitats, Birds, Newfoundland and Labrador, Herring-gull, Herring gull

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