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dc.contributor.authorVestheim, Hege
dc.contributor.authorRøstad, Anders
dc.contributor.authorKlevjer, Thor A.
dc.contributor.authorSolberg, Ingrid
dc.contributor.authorKaartvedt, Stein
dc.date.accessioned2014-08-27T09:52:13Z
dc.date.available2014-08-27T09:52:13Z
dc.date.issued2013-11-11
dc.identifier.citationVestheim H, Rostad A, Klevjer TA, Solberg I, Kaartvedt S (2013) Vertical distribution and diel vertical migration of krill beneath snow-covered ice and in ice-free waters. Journal of Plankton Research 36: 503-512. doi:10.1093/plankt/fbt112.
dc.identifier.issn14643774
dc.identifier.pmid24616550
dc.identifier.doi10.1093/plankt/fbt112
dc.identifier.urihttp://hdl.handle.net/10754/325458
dc.description.abstractA bottom mounted upward looking Simrad EK60 120-kHz echo sounder was used to study scattering layers (SLs) and individuals of the krill Meganyctiphanes norvegica. The mooring was situated at 150-m depth in the Oslofjord, connected with an onshore cable for power and transmission of digitized data. Records spanned 5 months from late autumn to spring. A current meter and CTD was associated with the acoustic mooring and a shore-based webcam monitored ice conditions in the fjord. The continuous measurements were supplemented with intermittent krill sampling campaigns and their physical and biological environment.The krill carried out diel vertical migration (DVM) throughout the winter, regardless of the distribution of potential prey. The fjord froze over in mid-winter and the daytime distribution of a mid-water SL of krill immediately became shallower associated with snow fall after freezing, likely related to reduction of light intensities. Still, a fraction of the population always descended all the way to the bottom, so that the krill population by day seemed to inhabit waters with light levels spanning up to six orders of magnitude. Deep-living krill ascended in synchrony with the rest of the population in the afternoon, but individuals consistently reappeared in near-bottom waters already? 1 h after the ascent. Thereafter, the krill appeared to undertake asynchronous migrations, with some krill always being present in near-bottom waters even though the entire population appeared to undertake DVM. The Author 2013. Published by Oxford University Press. All rights reserved.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.rightsThis is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.subjectMeganyctiphanes norvegica
dc.subjectNorway
dc.subjectSea ice
dc.subjectStationary acoustics
dc.subjectSynchronous and asynchronous DVM
dc.subjectbottom water
dc.subjectcrustacean
dc.subjectdiel migration
dc.subjectecho sounder
dc.subjectfjord
dc.subjectlight effect
dc.subjectpopulation distribution
dc.subjectseasonal variation
dc.subjectsynchrony
dc.subjectOslofjorden
dc.titleVertical distribution and diel vertical migration of krill beneath snow-covered ice and in ice-free waters
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentMarine Science Program
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.identifier.journalJournal of Plankton Research
dc.identifier.pmcidPMC3945875
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Biosciences, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway
dc.contributor.institutionInstitute of Marine Research, PO Box 1870 Nordnes, 5817 Bergen, Norway
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personVestheim, Hege
kaust.personRøstad, Anders
kaust.personSolberg, Ingrid
kaust.personKaartvedt, Stein
refterms.dateFOA2018-06-13T15:26:09Z
dc.date.published-online2013-11-11
dc.date.published-print2014-03-01


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This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Except where otherwise noted, this item's license is described as This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.