The diet of the Imperial Shag Phalacrocorax atriceps at a colony on New Island, Falkland/Malvinas Islands combining different sampling techniques

Autor(en): Michalik, Andreas
van Noordwijk, Hendrika J.
Brickle, Paul
Eggers, Till
Quillfeldt, Petra
Stichwörter: ANTARCTIC SHAG; Biodiversity & Conservation; Biodiversity Conservation; BLUE-EYED SHAG; BRANSFIELDENSIS; CARBO-SINENSIS; CORMORANTS; Diet; DIVING BEHAVIOR; Ecology; Environmental Sciences & Ecology; Falkland/Malvinas Islands; Imperial Cormorant; MACQUARIE-ISLAND; NELSON ISLAND; ORKNEY ISLANDS; Pellet; Regurgitation; SOUTH-SHETLAND ISLANDS; Stomach content
Erscheinungsdatum: 2010
Herausgeber: SPRINGER
Journal: POLAR BIOLOGY
Volumen: 33
Ausgabe: 11
Startseite: 1537
Seitenende: 1546
Zusammenfassung: 
The diet of the Imperial Shag Phalacrocorax atriceps was studied on New Island, Falkland/Malvinas Islands during the 2008/2009 breeding season, with some additional data from 2007/2008. The diet comprised a large variety of prey, mainly fish, crustaceans and squid. In contrast to other species of the blue-eyed shag complex, prey not only consisted of benthic organisms but also included pelagic prey. Different sampling techniques were combined in order to obtain a comprehensive overview of the diet. Pellets, regurgitations and stomach contents yielded different results. We discuss the causes for these variations including different sample availability over time. In particular, the stomach analyses seem to overestimate the importance of squid based on the occurrence of squid beaks. For the pellet analyses, lobster krill accounted for the majority of the prey remains except during the second half of December (i.e. when young chicks were being attended), when fish was more important.
ISSN: 07224060
DOI: 10.1007/s00300-010-0843-7

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