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Trophic ecology of a resident Yellow-legged Gull (Larus michahellis) population in the Bay of Biscay
Institution:1. Littoral, Environnement et Sociétés, UMRi 7266 CNRS — Université La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France;2. University of Science and Technology of Hanoi, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam;3. LPO (Ligue pour la Protection des Oiseaux), Fonderies Royales, 8 rue du Dr Pujos, 17305 Rochefort, France;4. Observatoire PELAGIS, UMS 3462 CNRS — Université La Rochelle, La Rochelle, France
Abstract:Stable isotopes analyses (SIAs) are an efficient tool to obtain a general insight into the diet of generalist consumers, such as the Yellow-legged Gull (Larus michahellis). Here we analysed δ13C, δ15N and δ34S values in feathers of chicks and adults, and used Bayesian triple-isotope mixing models to reconstruct the diet of a Yellow-legged Gull population breeding in the southeastern Bay of Biscay. Questions to test were (1) whether adults and chicks rely on different feeding resources during breeding period; (2) whether there is a seasonal foraging effect involving a higher proportion of refuse food in winter compared to summer, and (3) the magnitude of the annual variation in diet. Prey consumption differed between colonies, among years, and also varied slightly between seasons, and this was mainly due to a differential use of prey of marine origin. However, diet did not differ between age classes. These results suggest a relatively monotonous diet with only slight variations from year to year, seasonally and at a local geographic scale.
Keywords:Diet  Generalist predator  Gulls  Marine fish prey  Northern Iberia  Refuse tips  Seabirds  Stable isotopes
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