Trophic ecology of a resident Yellow-legged Gull (Larus michahellis) population in the Bay of Biscay.
Mar Environ Res
; 87-88: 19-25, 2013.
Article
en En
| MEDLINE
| ID: mdl-23541603
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 δ(13)C, δ(15)N and δ(34)S 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.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Estado Nutricional
/
Charadriiformes
/
Dieta
/
Conducta Alimentaria
Tipo de estudio:
Prognostic_studies
Límite:
Animals
País/Región como asunto:
Europa
Idioma:
En
Revista:
Mar Environ Res
Asunto de la revista:
BIOLOGIA
/
SAUDE AMBIENTAL
/
TOXICOLOGIA
Año:
2013
Tipo del documento:
Article
País de afiliación:
España
Pais de publicación:
Reino Unido