NDLI: Seasonal differences in at-sea activity of seabirds underline high energetic demands during the breeding period

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Seasonal differences in at-sea activity of seabirds underline high energetic demands during the breeding period

Content Provider	Springer Nature Link
Author	Markones, Nele Dierschke, Volker Garthe, Stefan
Copyright Year	2009
Abstract	We assessed seasonal differences in at-sea activity of Lesser Black-backed Gulls Larus fuscus, Black-legged Kittiwakes Rissa tridactyla and Common Guillemots Uria aalge in the south-eastern North Sea. The three species correspond to different ecological groups, with Lesser Black-backed Gulls representing omnivorous generalists, Kittiwakes representing surface-feeding pelagic seabirds, and Guillemots representing pursuit-diving pelagic seabirds. Using data from aerial surveys, we differentiated between active (flying or scavenging at fishing vessels) and inactive behaviour (swimming). We estimated the activity budgets of all three species for the different seasons and tested for differences in activity between different seasons. All species exhibited significant seasonal differences in activity, with the highest levels of activity observed during the breeding season. Numbers of flying auks were, however, exceptionally low in autumn due to moult and guarding of not-yet fledged chicks at sea. Our results underline the high energetic demands of the breeding season that lead to increased foraging and travelling activity.
Starting Page	329
Ending Page	336
Page Count	8
File Format	PDF
ISSN	00218375
Journal	Journal für Ornithologie
Volume Number	151
Issue Number	2
e-ISSN	14390361
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-10-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Black-legged Kittiwake Lesser Black-backed Gull Common Guillemot At-sea activity Time–activity budget Seasonality Evolutionary Biology Animal Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology

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