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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Food choice of birds from the German North Sea coast (2012)
Auteurs :	Philipp Schwemmer, Auteur ; Franziska Guepner, Auteur ; Nils Guse, Auteur ; Stefan Garthe, Auteur
Type de document :	Article
Dans :	Vogelwarte (50(3) AUG 2012)
Article en page(s) :	141-154
Langues:	Allemand
Résumé :	Sound knowledge on the food choice of seabirds and coastal birds essentially contributes to the understanding of marine food webs. In the present study stomach contents of beached coastal birds from the German North Sea coast were analysed. The first aim of the study was to collect up to date data on the food choice of Oystercatchers (Haematopus ostralegus), Curlews (Numenius arquata), Red Knots (Calidris canutus) and Black-headed Gulls (Chroicocephalus ridibundus). The second aim was to proof, if beached birds are valuable to provide information on food choice of coastal birds. For these purposes overall 59 individuals of the four species were collected by a network of volunteers along the German North Sea coast and subsequently dissected.All stomachs contained prey remains that could be determined. Oystercatchers and Black-headed Gulls showed a very similar and at the same time the broadest prey spectrum. It mainly consisted of molluscs, polychaetes, earthworms and insects. Marine and terrestrial prey remains were found in stomachs of Oystercatchers during all periods of the year, whereas Black-headed Gulls took up more marine prey during the breeding season and switched to an almost exclusively terrestrial nutrition during other seasons. Most Curlews fed on polychaetes and crustaceans and - less frequently - on bivalves. The food choice of Red Knots differed strongest from the other species and showed the highest degree of specialisation. All stomachs of Red Knot contained mud snails (Hydrobia ulvae) and a high proportion of stomachs contained common periwinkles (Littorina littorea) and bivalves. Several stomachs of all bird species (except Curlews) contained small particles of plastic waste that were most likely taken up in the marine foraging habitat.In Black-headed Gulls, the results of the current study fit well to previous studies based on pellet analyses. The food choice of the other bird species was consistent with previous studies as well. It can be concluded that the analyses of stomach contents of beached coastal birds is a valuable method to collect up to date information on their food choice. However, the sample sizes need to be increased to gain robust data on spatial and temporal difference in food choice. Eventually, a comparison between stomach contents and stable isotope signatures from muscle tissue may help to support the results of the current study.

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