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dc.contributor.authorTarroux, Arnaud
dc.contributor.authorCherel, Yves
dc.contributor.authorFauchald, Per
dc.contributor.authorKato, Akiko
dc.contributor.authorLove, Oliver P.
dc.contributor.authorRopert-Coudert, Yan
dc.contributor.authorSpreen, Gunnar
dc.contributor.authorVarpe, Øystein
dc.contributor.authorWeimerskirch, Henri
dc.contributor.authorYoccoz, Nigel
dc.contributor.authorZahn, Sandrine
dc.contributor.authorDescamps, Sebastien
dc.description.abstract1. Individual heterogeneity in diet and foraging behaviour is common in wild animal populations, and can be a strong determinant of how populations respond to environmental changes. Within populations, variation in foraging behaviour and the occurrence of individual tactics in relation to resources distribution can help explain differences in individual fitness, and ultimately identify important factors affecting population dynamics. We examined how foraging behaviour and habitat during the breeding period related to the physiological state of a long-ranging seabird adapted to sea ice, the Antarctic petrel Thalassoica antarctica. 2. Firstly, using GPS tracking and state-switching movement modelling (hidden Markov models) on 124 individual birds, we tested for the occurrence of distinct foraging tactics within our study population. Our results highlight a large variation in the movement and foraging behaviour of a very mobile seabird, and delineate distinct foraging tactics along a gradient from foraging in dense pack ice to foraging in open water. 3. Secondly, we investigated the effects of these foraging tactics on individual state at return from a foraging trip. We combined movement data with morphometric and physiological measurements of a suite of plasma metabolites that provided a general picture of a bird's individual state. Foraging in denser sea ice was associated with lower gain in body mass during brooding, as well as lower level of energy acquisition (plasma triacylglycerol) during both brooding and incubation. We found no clear relationship between the foraging tactic in relation to sea ice and the energetic stress (changes in plasma corticosterone), energetic balance (β-hydroxybutyrate) or trophic level (δ15N). However, a shorter foraging range was related to both the energetic balance (positively) and the trophic level (negatively). 4. Our results highlight a diverse range of foraging tactics in relation to sea ice in Antarctic petrels. While the various foraging tactics do not seem to strongly alter energetic balance, they may affect other aspects of Antarctic petrels' physiology. Future changes in sea-ice habitats can thus be expected to have an impact on the individual state of seabirds such as Antarctic petrels, which could ultimately affect their population dynamics. Nonetheless, strong individual heterogeneity in the use of sea-ice habitats by a typical pagophilic species might strengthen its resilience to environmental changes and in particular to forecasted sea-ice loss.en_US
dc.rightsNavngivelse-Ikkekommersiell 4.0 Internasjonal*
dc.subjectAntarctic petrelen_US
dc.subjectGPS trackingen_US
dc.subjectindividual variationen_US
dc.subjectoptimal foragingen_US
dc.subjectphysiological indicatorsen_US
dc.subjectSouthern Oceanen_US
dc.subjectstable isotopesen_US
dc.subjectSvarthamaren breeding colonyen_US
dc.titleForaging tactics in dynamic sea-ice habitats affect individual state in a long-ranging seabirden_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder© 2020 The Authors.en_US
dc.subject.nsiVDP::Zoologiske og botaniske fag: 480en_US
dc.subject.nsiVDP::Zoology and botany: 480en_US
dc.source.journalFunctional Ecologyen_US
dc.relation.projectNorges forskningsråd: xxxxxxen_US
dc.relation.projectEgen institusjon: Norwegian institute for nature research (NINA)en_US

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Navngivelse-Ikkekommersiell 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse-Ikkekommersiell 4.0 Internasjonal