Krill (Meganyctiphanes norvegica) swim faster at night

Handle URI:
http://hdl.handle.net/10754/554380
Title:
Krill (Meganyctiphanes norvegica) swim faster at night
Authors:
Klevjer, Thor A.; Kaartvedt, Stein ( 0000-0002-8793-2948 )
Abstract:
Krill are key members in marine food webs, and measurement of swimming speed is vital to assess their bioenergetic budgets, feeding, and encounters with predators. We document a consistent and marked diel signal in swimming speed of krill in their natural habitat that is not related to diel vertical migration. The results were obtained using a bottom-mounted, upward-looking echo sounder at 150-m depth in the Oslofjord, Norway, spanning 5 months from late autumn to spring at a temporal resolution of ~1–2 records s−1. Swimming speed was assessed using acoustic target tracking of individual krill. At the start of the registration period, both daytime and nocturnal average swimming speeds of Meganyctiphanes norvegica were ~ 3.5 cm s−1 (~ 1 body lengths ([bl] s−1) in waters with oxygen concentrations of ~ 15–20% O2 saturation. Following intrusion of more oxygenated water, nocturnal average swimming speeds increased to ~ 10 cm s−1 (~ 3 bl s−1), i.e., more than double that of daytime swimming speeds in the same period. We hypothesize that krill activity during the first period was limited by oxygen, and the enhanced swimming at night subsequent to the water renewal is due to increased feeding activity under lessened danger of predation in darkness.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division
Citation:
Krill (Meganyctiphanes norvegica) swim faster at night, 2011, 56 (3):765 Limnology and Oceanography
Journal:
Limnology and Oceanography
Issue Date:
May-2011
DOI:
10.4319/lo.2011.56.3.0765
Type:
Article
ISSN:
00243590
Additional Links:
http://doi.wiley.com/10.4319/lo.2011.56.3.0765
Appears in Collections:
Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorKlevjer, Thor A.en
dc.contributor.authorKaartvedt, Steinen
dc.date.accessioned2015-05-21T06:37:01Zen
dc.date.available2015-05-21T06:37:01Zen
dc.date.issued2011-05en
dc.identifier.citationKrill (Meganyctiphanes norvegica) swim faster at night, 2011, 56 (3):765 Limnology and Oceanographyen
dc.identifier.issn00243590en
dc.identifier.doi10.4319/lo.2011.56.3.0765en
dc.identifier.urihttp://hdl.handle.net/10754/554380en
dc.description.abstractKrill are key members in marine food webs, and measurement of swimming speed is vital to assess their bioenergetic budgets, feeding, and encounters with predators. We document a consistent and marked diel signal in swimming speed of krill in their natural habitat that is not related to diel vertical migration. The results were obtained using a bottom-mounted, upward-looking echo sounder at 150-m depth in the Oslofjord, Norway, spanning 5 months from late autumn to spring at a temporal resolution of ~1–2 records s−1. Swimming speed was assessed using acoustic target tracking of individual krill. At the start of the registration period, both daytime and nocturnal average swimming speeds of Meganyctiphanes norvegica were ~ 3.5 cm s−1 (~ 1 body lengths ([bl] s−1) in waters with oxygen concentrations of ~ 15–20% O2 saturation. Following intrusion of more oxygenated water, nocturnal average swimming speeds increased to ~ 10 cm s−1 (~ 3 bl s−1), i.e., more than double that of daytime swimming speeds in the same period. We hypothesize that krill activity during the first period was limited by oxygen, and the enhanced swimming at night subsequent to the water renewal is due to increased feeding activity under lessened danger of predation in darkness.en
dc.relation.urlhttp://doi.wiley.com/10.4319/lo.2011.56.3.0765en
dc.rightsArchived with thanks to Limnology and Oceanographyen
dc.titleKrill (Meganyctiphanes norvegica) swim faster at nighten
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalLimnology and Oceanographyen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Biology, University of Oslo, Oslo, Norwayen
kaust.authorKlevjer, Thor Aleksanderen
kaust.authorKaartvedt, Steinen
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