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dc.contributor.authorMoe, Børge
dc.contributor.authorDaunt, Francis
dc.contributor.authorBråthen, Vegard Sandøy
dc.contributor.authorBarrett, Robert
dc.contributor.authorBallesteros, Manuel
dc.contributor.authorBjørnstad, Oskar
dc.contributor.authorBogdanova, Maria I.
dc.contributor.authorDehnhard, Nina
dc.contributor.authorErikstad, Kjell E.
dc.contributor.authorFollestad, Arne
dc.contributor.authorGíslason, Sindri
dc.contributor.authorHallgrimsson, Gunnar Thor
dc.contributor.authorLorentsen, Svein-Håkon
dc.contributor.authorNewell, Mark
dc.contributor.authorPetersen, Aevar
dc.contributor.authorPhillips, Richard A.
dc.contributor.authorRagnarsdóttir, Sunna Björk
dc.contributor.authorReiertsen, Tone Kristin
dc.contributor.authorÅström, Jens
dc.contributor.authorWanless, Sarah
dc.contributor.authorAnker-Nilssen, Tycho
dc.date.accessioned2021-11-18T09:54:05Z
dc.date.available2021-11-18T09:54:05Z
dc.date.issued2021-10-14
dc.description.abstractSpecies breeding at high latitudes face a significant challenge of surviving the winter. Such conditions are particularly severe for diurnal marine endotherms such as seabirds. A critical question is therefore what behavioural strategies such species adopt to maximise survival probability. We tested 3 hypotheses: (1) they migrate to lower latitudes to exploit longer day length (‘sun-chasing’), (2) they forage at night (‘night-feeding’), or (3) they target high-quality food patches to minimise foraging time (‘feasting’). We studied the winter migration and foraging strategies of European shags Phalacrocorax aristotelis from 6 colonies across a latitudinal gradient from temperate regions to north of the Arctic Circle using geolocators deployed over 11 winters. We found evidence for ‘sun-chasing’, whereby average southerly movements were greatest from colonies at higher latitudes. However, a proportion of individuals from higher latitudes remained resident in winter and, in the absence of daylight, they foraged during twilight and only very occasionally during the night. At lower latitudes, there was little evidence that individuals migrated south, nocturnal feeding was absent, and twilight feeding was infrequent, suggesting that there was sufficient daylight in winter. There was no evidence that winter foraging time was lowest at higher latitudes, as predicted by the ‘feasting’ hypothesis. Our results suggest that shags adopt different behavioural strategies to survive the winter across their latitudinal range, dictated by the differing light constraints. Our study highlights the value of multi-colony studies in testing key hypotheses to explain population persistence in seabird species that occur over large latitudinal ranges.en_US
dc.identifier.citationMoe B, Daunt F, Bråthen VS, Barrett R, Ballesteros M, Bjørnstad O, Bogdanova MI, Dehnhard N, Erikstad KE, Follestad A, Gíslason, Hallgrimsson GT, Lorentsen S.-H., Newell M, Petersen A, Phillips RA, Ragnarsdóttir SB, Reiertsen TK, Åström J, Wanless S, Anker-Nilssen T. Twilight foraging enables European shags to survive the winter across their latitudinal range. Marine Ecology Progress Series. 2021;676:145-157en_US
dc.identifier.cristinIDFRIDAID 1950028
dc.identifier.doi10.3354/meps13697
dc.identifier.issn0171-8630
dc.identifier.issn1616-1599
dc.identifier.urihttps://hdl.handle.net/10037/23058
dc.language.isoengen_US
dc.publisherInter Researchen_US
dc.relation.journalMarine Ecology Progress Series
dc.relation.projectIDNorges forskningsråd: 192141en_US
dc.relation.projectIDFramsenteret: 232019en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/MARINFORSK/192141/Norway/SEAPOP//en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480en_US
dc.titleTwilight foraging enables European shags to survive the winter across their latitudinal rangeen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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