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dc.contributor.authorVance, H. M.
dc.contributor.authorHooker, S. K.
dc.contributor.authorMikkelsen, L.
dc.contributor.authorvan Neer, A.
dc.contributor.authorTeilmann, J.
dc.contributor.authorSiebert, U.
dc.contributor.authorJohnson, M.
dc.identifier.citationVance , H M , Hooker , S K , Mikkelsen , L , van Neer , A , Teilmann , J , Siebert , U & Johnson , M 2021 , ' Drivers and constraints on offshore foraging in harbour seals ' , Scientific Reports , vol. 11 , 6514 .
dc.identifier.otherPURE: 273482676
dc.identifier.otherPURE UUID: 4c6dc092-105f-478c-877a-7de9642c3d3e
dc.identifier.otherRIS: urn:82A514AD134B9C65343BFFCECE725C89
dc.identifier.otherRIS: Vance2021
dc.identifier.otherORCID: /0000-0002-7518-3548/work/91340745
dc.identifier.otherScopus: 85103209117
dc.identifier.otherWOS: 000634963000033
dc.descriptionThis study was funded by the German Federal Agency of Nature Conservation under the projects “Effects of underwater noise on marine vertebrates” (Cluster 7, Z1.2-53302/2010/14) and “Under Water Noise Effects – UWE” (Project numbers FKZ 3515822000). Catches were funded and supported by the Schleswig-Holstein’s Government-Owned Company for Coastal Protection, National Parks and Ocean Protection. We thank all helpers during the seal catches. Development of the tags was aided by a Marie Curie-Sklodowska Career Integration Grant (EU-FP7) to MJ and by MASTS, the Marine Alliance for Science and Technology Scotland. MJ is supported by the Aarhus University Research Foundation and the EU H2020 research and innovation programme under Marie Skłodowska-Curie grant 754513.en
dc.description.abstractCentral place foragers are expected to offset travel costs between a central place and foraging areas by targeting productive feeding zones. Harbour seals (Phoca vitulina) make multi-day foraging trips away from coastal haul-out sites presumably to target rich food resources, but periodic track points from telemetry tags may be insufficient to infer reliably where, and how often, foraging takes place. To study foraging behaviour during offshore trips, and assess what factors limit trip duration, we equipped harbour seals in the German Wadden Sea with high-resolution multi-sensor bio-logging tags, recording 12 offshore trips from 8 seals. Using acceleration transients as a proxy for prey capture attempts, we found that foraging rates during travel to and from offshore sites were comparable to offshore rates. Offshore foraging trips may, therefore, reflect avoidance of intra-specific competition rather than presence of offshore foraging hotspots. Time spent resting increased by approx. 37 min/day during trips suggesting that a resting deficit rather than patch depletion may influence trip length. Foraging rates were only weakly correlated with surface movement patterns highlighting the value of integrating multi-sensor data from on-animal bio-logging tags (GPS, depth, accelerometers and magnetometers) to infer behaviour and habitat use.
dc.relation.ispartofScientific Reportsen
dc.rightsCopyright © The Author(s) 2021. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit
dc.subjectQH301 Biologyen
dc.titleDrivers and constraints on offshore foraging in harbour sealsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. Institute of Behavioural and Neural Sciencesen
dc.contributor.institutionUniversity of St Andrews. St Andrews Sustainability Instituteen
dc.contributor.institutionUniversity of St Andrews. Sea Mammal Research Uniten
dc.contributor.institutionUniversity of St Andrews. Marine Alliance for Science & Technology Scotlanden
dc.description.statusPeer revieweden

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