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dc.contributor.authorKrafft, BA
dc.contributor.authorSkaret, G
dc.contributor.authorKnutsen, T
dc.contributor.authorMelle, W
dc.contributor.authorKlevjer, Thor Aleksander
dc.contributor.authorSøiland, H
dc.date.accessioned2015-05-26T07:27:45Z
dc.date.available2015-05-26T07:27:45Z
dc.date.issued2012-09-28
dc.identifier.citationAntarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean 2012, 465:69 Marine Ecology Progress Series
dc.identifier.issn0171-8630
dc.identifier.issn1616-1599
dc.identifier.doi10.3354/meps09876
dc.identifier.urihttp://hdl.handle.net/10754/555782
dc.description.abstractKnowledge about swarm dynamics and underlying causes is essential to understand the ecology and distribution of Antarctic krill Euphausia superba. We collected acoustic data and key environmental data continuously across extensive gradients in the little-studied Southeast Atlantic sector of the Southern Ocean. A total of 4791 krill swarms with swarm descriptors including swarm height and length, packing density, swimming depth and inter-swarm distance were extracted. Through multivariate statistics, swarms were categorized into 4 groups. Group 2 swarms were largest (median length 108 m and thickness 18 m), whereas swarms in both Groups 1 and 4 were on average small, but differed markedly in depth distribution (median: 52 m for Group 1 vs. 133 m for Group 4). There was a strong spatial autocorrelation in the occurrence of swarms, and an autologistic regression model found no prediction of swarm occurrence from environmental variables for any of the Groups 1, 2 or 4. Probability of occurrence of Group 3 swarms, however, increased with increasing depth and temperature. Group 3 was the most distinctive swarm group with an order of magnitude higher packing density (median: 226 ind. m−3) than swarms from any of the other groups and about twice the distance to nearest neighbor swarm (median: 493 m). The majority of the krill were present in Group 3 swarms, and the absence of association with hydrographic or topographic concentrating mechanisms strongly suggests that these swarms aggregate through their own locomotion, possibly associated with migration.
dc.publisherInter-Research Science Center
dc.relation.urlhttp://www.int-res.com/abstracts/meps/v465/p69-83/
dc.rightsArchived with thanks to Marine Ecology Progress Series
dc.subjectEuphausia superba
dc.subjectAggregation
dc.subjectAcoustics
dc.subjectSwarm
dc.subjectBouvetøya
dc.titleAntarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean
dc.typeArticle
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.identifier.journalMarine Ecology Progress Series
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionInstitute of Marine Research, 5870 Bergen, Norway
dc.contributor.institutionDepartment of Biology, University of Oslo, 0316 Oslo, Norway
kaust.personKlevjer, Thor Aleksander
refterms.dateFOA2017-09-28T00:00:00Z


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