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dc.contributor.authorHeide-Jørgensen, Mads
dc.contributor.authorLaidre, Kristin L
dc.contributor.authorNielsen, Nynne H
dc.contributor.authorHansen, Rikke G
dc.contributor.authorRøstad, Anders
dc.date.accessioned2015-12-08T05:54:35Z
dc.date.available2015-12-08T05:54:35Z
dc.date.issued2013-10-31
dc.identifier.citationWinter and spring diving behavior of bowhead whales relative to prey 2013, 1 (1):15 Animal Biotelemetry
dc.identifier.issn2050-3385
dc.identifier.doi10.1186/2050-3385-1-15
dc.identifier.urihttp://hdl.handle.net/10754/583361
dc.description.abstractBackground Little is known about bowhead whale (Balaena mysticetus) foraging behavior and what concentrations of prey are required to balance the energetic trade-offs of feeding. We used satellite telemetry, archival depth recorders, and water column echo sounding data to study bowhead whale diving behavior relative to prey depth and concentration in Disko Bay, West Greenland. Results Between March and May 2008 to 2011, nine bowhead whales were tagged in Disko Bay, West Greenland with instruments that collected data on location and diving over a period of 1 to 33 days. The frequency of U-dives (presumed to be foraging dives) was low during winter months but more than doubled in spring concurrent with a decrease in diving depth. The mean speed of the horizontal bottom phase of the U-dives was 0.9 ms-1 and on average, whales spent 37% of their time at the bottom phase of the dive. In March, bowhead whales presumably fed on copepods (Calanus spp.) close to the seabed (between 100 and 400 m). In April and May, after the copepods ascended to shallower depths, bowhead whales also dove to shallower depths (approximately 30 m) more often. However, echo sounding surveys in the vicinity of feeding whales in early May indicated that patches of copepods could still be found close to the seabed. Conclusions There was a marked change in diving behavior from winter through spring and this was likely in response to the changes in sea ice conditions, primary production and potential copepod abundance in the upper part of the water column. Depth and duration of dives changed significantly during this period; however, other dive parameters (for example the proportion of time spent feeding on the bottom of U-dives) remained fairly constant indicating a constant feeding effort. Bowhead whales target copepods at or close to the seabed in winter months in Disko Bay and continue feeding on copepods when they migrate to the surface. However, bowhead whales leave West Greenland before peak abundance of copepods occurs at the surface.
dc.language.isoen
dc.publisherSpringer Nature
dc.relation.urlhttp://www.animalbiotelemetry.com/content/1/1/15
dc.rightsThis article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://​creativecommons.​org/​licenses/​by/​2.​0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.subjectBowhead whale
dc.subjectCalanus
dc.subjectCopepods
dc.subjectArctic
dc.subjectGreenland
dc.subjectFeeding
dc.subjectFastLoc GPS tags
dc.subjectDiving behavior
dc.titleWinter and spring diving behavior of bowhead whales relative to prey
dc.typeArticle
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.identifier.journalAnimal Biotelemetry
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionGreenland Institute of Natural Resources, Box 570, Nuuk 3900, Greenland
dc.contributor.institutionPolar Science Center, Applied Physics Laboratory, University of Washington, 1013 NE 40th Street, Seattle, WA 98105, USA
dc.contributor.institutionDepartment of Biosciences, University of Oslo, PO Box 1066, Blindern N-0316, Oslo, Norway
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personRøstad, Anders
refterms.dateFOA2018-06-13T11:56:18Z
dc.date.published-online2013-10-31
dc.date.published-print2013


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