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dc.contributor.authorKaartvedt, Stein
dc.contributor.authorKlevjer, Thor Aleksander
dc.contributor.authorAksnes, Dag L.
dc.date.accessioned2015-05-26T07:23:10Z
dc.date.available2015-05-26T07:23:10Z
dc.date.issued2012-04-25
dc.identifier.citationInternal wave-mediated shading causes frequent vertical migrations in fishes 2012, 452:1 Marine Ecology Progress Series
dc.identifier.issn0171-8630
dc.identifier.issn1616-1599
dc.identifier.doi10.3354/meps09688
dc.identifier.urihttp://hdl.handle.net/10754/555758
dc.description.abstractWe provide evidence that internal waves cause frequent vertical migrations (FVM) in fishes. Acoustic data from the Benguela Current revealed that pelagic scattering layers of fish below ~140 m moved in opposite phases to internal waves, ascending ~20 m towards the wave trough and descending from the wave crest. At the trough, the downward displacement of upper waters and the upward migration of fish created an overlapping zone. Near-bottom fish correspondingly left the benthic boundary zone at the wave trough, ascending into an acoustic scattering layer likely consisting of zooplankton and then descending to the benthic boundary zone at the wave crest. We suggest that this vertical fish migration is a response to fluctuations in light intensity of 3 to 4 orders of magnitude caused by shading from a turbid surface layer that had chlorophyll a values of 3 to 4 mg m−3 and varied in thickness from ~15 to 50 m at a temporal scale corresponding to the internal wave period (30 min). This migration frequency thus is much higher than that of the common and widespread light-associated diel vertical migration. Vertical movements affect prey encounters, growth, and survival. We hypothesize that FVM increase the likelihood of prey encounters and the time for safe visual foraging among planktivorous fish, thereby contributing to efficient trophic transfer in major upwelling areas.
dc.publisherInter-Research Science Center
dc.relation.urlhttp://www.int-res.com/abstracts/meps/v452/p1-10/
dc.rightsArchived with thanks to Marine Ecology Progress Series © 2012 Inter-Research
dc.subjectInternal waves
dc.subjectShading
dc.subjectAntipredation window
dc.subjectVertical migration
dc.subjectAcoustics
dc.titleInternal wave-mediated shading causes frequent vertical migrations in fishes
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.journalMarine Ecology Progress Series
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Biology, University of Oslo, 0316 Oslo, Norway
dc.contributor.institutionDepartment of Biology, University of Bergen, 5020 Bergen, Norway
kaust.personKaartvedt, Stein
kaust.personKlevjer, Thor Aleksander
refterms.dateFOA2017-04-25T00:00:00Z


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