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dc.date.accessioned2017-05-16T11:06:07Z
dc.date.available2017-05-16T11:06:07Z
dc.date.created2012-11-22T09:48:06Z
dc.date.issued2012
dc.identifier.citationSolberg, Ingrid Klevjer, Thor A. Kaartvedt, Stein . Continuous acoustic studies of overwintering sprat Sprattus sprattus reveal flexible behavior. Marine Ecology Progress Series. 2012, 464, 245-256
dc.identifier.urihttp://hdl.handle.net/10852/55418
dc.description.abstractThe clupeid fish Sprattus sprattus was studied in a 150 m deep Norwegian fjord throughout an entire overwintering period during which the fjord froze over and a major water renewal occurred. A bottom-mounted (upward-facing) echosounder provided continuous highresolution data and enabled studies of swimming speed and behavior of individual sprat in addition to population behavior. The continuous acoustic studies were supplemented with intermittent field campaigns. The sprat displayed different behavioral modes with changing environmental conditions. During the first part of the winter, the majority of the population occurred in deep waters during both day and night, yet exhibited a shallower night-time distribution. Individual sprat swam alternately up and down, a ‘rise and sink’ behavior likely a compensation for negative buoyancy because of swim bladder compression. Because feeding was negligible in deep waters, the swimming pattern was not inferred as prey search behavior. Another part of the population schooled at shallower depths during the day and carried out vertical migration to upper waters at night. However, individuals were observed as they switched between these behavioral groups. A sudden change in both swimming behavior and vertical distribution occurred as the fjord became ice covered. Near-bottom ‘rise and sink’ swimming was replaced by schooling in midwater during the day, and the sprat aggregated in dense layers near the surface at night. We suggest that the ice made the sprat shift their antipredator strategy from hiding at depth to hiding in schools in the darker waters below the ice. This long-term acoustic study has shown that sprat have a flexible behavioral repertoire, displaying different overwintering strategies within a population, depending on environmental conditions.
dc.languageEN
dc.relation.ispartofIngrid Solberg (2017) Behavior and ecology of overwintering sprat Sprattus sprattus. Doctoral thesis. http://urn.nb.no/URN:NBN:no-58206
dc.rightsAttribution 3.0 Unported
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.titleContinuous acoustic studies of overwintering sprat Sprattus sprattus reveal flexible behavior
dc.typeJournal article
dc.creator.authorSolberg, Ingrid
dc.creator.authorKlevjer, Thor A.
dc.creator.authorKaartvedt, Stein
cristin.unitcode185,15,21,0
cristin.unitnameInstitutt for biovitenskap (tidl. BIO)
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.cristin964077
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Marine Ecology Progress Series&rft.volume=464&rft.spage=245&rft.date=2012
dc.identifier.jtitleMarine Ecology Progress Series
dc.identifier.volume464
dc.identifier.startpage245
dc.identifier.endpage256
dc.identifier.doihttps://doi.org/10.3354/meps09877
dc.identifier.urnURN:NBN:no-58212
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.source.issn0171-8630
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/55418/2/m464p245.pdf
dc.type.versionPublishedVersion


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