Stable isotopes reveal variable foraging behaviour in a colony of the Imperial Shag Phalacrocorax atriceps: differences between ages, sexes and years
DC Element | Wert | Sprache |
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dc.contributor.author | Michalik, Andreas | |
dc.contributor.author | McGill, Rona A. R. | |
dc.contributor.author | van Noordwijk, Hendrika J. | |
dc.contributor.author | Masello, Juan F. | |
dc.contributor.author | Furness, Robert W. | |
dc.contributor.author | Eggers, Till | |
dc.contributor.author | Quillfeldt, Petra | |
dc.date.accessioned | 2021-12-23T16:19:31Z | - |
dc.date.available | 2021-12-23T16:19:31Z | - |
dc.date.issued | 2013 | |
dc.identifier.issn | 21937192 | |
dc.identifier.uri | https://osnascholar.ub.uni-osnabrueck.de/handle/unios/13180 | - |
dc.description.abstract | Stable isotope analysis (SIA) is used in the study of trophic relationships in food webs, being also a powerful tool for the study of intraspecific diet segregation. Unlike short-term data from most conventional diet studies, SIA can also provide information about times when sea-birds stay out at sea and are thus not easily accessible. Imperial Shags Phalacrocorax atriceps are resident sea-birds showing sexual dimorphism in body size. Previous studies showed strong intra-species dietary segregation between male and female Imperial Shags during the breeding season. Between 2006 and 2009 at New Island in the Falkland Islands/Islas Malvinas (southwest Atlantic), we investigated if intraspecific differences were also present between age-groups, namely adults and immature males. We further tested if differences existed over the year, particularly during the non-breeding season. Finally, we tested if differences were consistent among studied years. We found no differences in delta C-13 values between immature and adult males. However, lower delta N-15 values indicated feeding at lower trophic levels for immatures. This might be explained by poorer hunting abilities of young, inexperienced birds, compared to adults. In both the breeding and non-breeding seasons, differences among years in both delta C-13 and delta N-15 suggest that the foraging behaviour of the shags differed among years in terms of spatial distribution and trophic level. Males consistently foraged on a higher trophic level than females and had lower delta C-13 values, which is in line with the use of foraging areas further offshore. | |
dc.description.sponsorship | DFG-German Research FoundationGerman Research Foundation (DFG) [Qu 148/1-ff]; DAAD-the German Academic Exchange ServiceDeutscher Akademischer Austausch Dienst (DAAD); Natural Environment Research Council, UKUK Research & Innovation (UKRI)Natural Environment Research Council (NERC); NERCUK Research & Innovation (UKRI)Natural Environment Research Council (NERC) [lsmsf010002] Funding Source: UKRI; Natural Environment Research CouncilUK Research & Innovation (UKRI)Natural Environment Research Council (NERC) [lsmsf010002] Funding Source: researchfish; We wish to thank to the New Island Conservation Trust, Ian, Maria and Georgina Strange and Dan Birch who facilitated fieldwork. Financial support for fieldwork came from DFG-German Research Foundation, (Qu 148/1-ff) and DAAD-the German Academic Exchange Service. Fieldwork at New Island was approved by the Falkland Islands Government (Environmental Planning Office). Funding for the stable isotope work was provided by the Natural Environment Research Council, UK. | |
dc.language.iso | en | |
dc.publisher | SPRINGER HEIDELBERG | |
dc.relation.ispartof | JOURNAL OF ORNITHOLOGY | |
dc.subject | BLOOD | |
dc.subject | C-13 ENRICHMENT | |
dc.subject | CARBON | |
dc.subject | DIET | |
dc.subject | DISCRIMINATION | |
dc.subject | FEATHERS | |
dc.subject | FOOD | |
dc.subject | Imperial Shag | |
dc.subject | Ornithology | |
dc.subject | Patagonian shelf | |
dc.subject | Phalacrocorax atriceps | |
dc.subject | SEGREGATION | |
dc.subject | SIGNATURES | |
dc.subject | Stable isotopes | |
dc.subject | TURNOVER | |
dc.subject | Zoology | |
dc.title | Stable isotopes reveal variable foraging behaviour in a colony of the Imperial Shag Phalacrocorax atriceps: differences between ages, sexes and years | |
dc.type | journal article | |
dc.identifier.doi | 10.1007/s10336-012-0890-7 | |
dc.identifier.isi | ISI:000314259900025 | |
dc.description.volume | 154 | |
dc.description.issue | 1 | |
dc.description.startpage | 239 | |
dc.description.endpage | 249 | |
dc.contributor.orcid | 0000-0002-4450-8688 | |
dc.contributor.orcid | 0000-0002-6826-4016 | |
dc.contributor.orcid | 0000-0003-0400-7288 | |
dc.contributor.researcherid | A-9549-2009 | |
dc.contributor.researcherid | C-7133-2009 | |
dc.contributor.researcherid | F-1793-2010 | |
dc.identifier.eissn | 21937206 | |
dc.publisher.place | TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY | |
dcterms.isPartOf.abbreviation | J. Ornithol. |
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geprüft am 24.05.2024