At-sea behaviour of three krill predators breeding at Bouvetøya—Antarctic fur seals, macaroni penguins and chinstrap penguins

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dc.contributor.author Blanchet, Marie-Anne
dc.contributor.author Biuw, Martin
dc.contributor.author Hofmeyr, G.J. Greg (Gordon John Gregory)
dc.contributor.author De Bruyn, P.J. Nico
dc.contributor.author Lydersen, Christian
dc.contributor.author Kovacs, Kit M., 1956-
dc.date.accessioned 2013-04-10T06:28:47Z
dc.date.available 2013-04-10T06:28:47Z
dc.date.issued 2013-03
dc.description.abstract Interspecific competition is an important structuring element in marine ecosystems, especially in the Southern Ocean which offers few prey choices to comparatively large predator populations. We present the first simultaneous observations of at-sea behaviour and attendance patterns of 3 synchronously breeding, central place, krill foragers at Bouvetøya—a small, isolated, sub-Antarctic island in the South Atlantic. Time depth recorders and satellite transmitters were deployed during the austral summer of 2007/2008 on 47 lactating Antarctic fur seals Arctocephalus gazella (AFS) rearing pups and on 20 macaroni Eudyptes chrysolophus (MAC) and 30 chinstrap Pygoscelis antarctica penguins (CHIN) rearing chicks. All 3 species showed a strong preference for the west side of the island, and their foraging ranges overlapped markedly. Solar elevation influenced the timing of departures from, and arrivals to, the island with markedly different patterns between the seals and the penguins. Diving patterns also showed significant differences among the 3 species, with the frequency of diving being higher at night for the AFS, while both penguin species dove more frequently during the day. But a common, vertical diel pattern occurred in all 3 species, with shallow diving occurring at night and deep diving during the day, consistent with the vertical migration of krill. MACs targeted 2 depth layers for feeding, including a deep prey layer at ~70 m, which was not exploited by AFSs and CHINs. The results suggest that there is potential for competitive overlap among these 3 krill predators at Bouvetøya, but that it is reduced via both spatial (horizontal and vertical) and temporal partitioning of foraging areas. en
dc.description.librarian hj2013 en
dc.description.librarian ab2013
dc.description.sponsorship The Norwegian Antarctic Research Expedition (NARE) programme en
dc.description.uri http://www.int-res.com/journals/meps/meps-home/ en
dc.identifier.citation Blanchet, MA, Biuw, M, Hofmeyr, GJG, De Bruyn, PJN, Lydersen, C & Kovacs, KM 2013, 'At-sea behaviour of three krill predators breeding at Bouvetøya—Antarctic fur seals, macaroni penguins and chinstrap penguins', Marine Ecology Progress Series, vol. 477, pp. 285-302. en
dc.identifier.issn 0173-9565 (print)
dc.identifier.issn 1439-0485 (online)
dc.identifier.other 10.3354/meps10110
dc.identifier.uri http://hdl.handle.net/2263/21261
dc.language.iso en en
dc.publisher Inter-Research Science en
dc.rights © Inter-Research 2013 en
dc.subject Competition en
dc.subject Diving behaviour en
dc.subject Foraging ecology en
dc.subject Niche separation en
dc.subject Southern Ocean en
dc.subject Macaroni penguins en
dc.subject Chinstrap penguins en
dc.subject Antarctic fur seals en
dc.subject.lcsh Krill en
dc.subject.lcsh Southern fur seals en
dc.subject.lcsh Penguins en
dc.subject.lcsh Marine ecology en
dc.title At-sea behaviour of three krill predators breeding at Bouvetøya—Antarctic fur seals, macaroni penguins and chinstrap penguins en
dc.type Postprint Article en


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