Krill (Meganyctiphanes norvegica) swim faster at night
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...
Published in: | Limnology and Oceanography |
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Online Access: | http://hdl.handle.net/10754/554380 https://doi.org/10.4319/lo.2011.56.3.0765 |
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ftkingabdullahun:oai:repository.kaust.edu.sa:10754/554380 2023-12-31T10:09:11+01:00 Krill (Meganyctiphanes norvegica) swim faster at night Klevjer, Thor Aleksander Kaartvedt, Stein Biological and Environmental Sciences and Engineering (BESE) Division Marine Science Program Red Sea Research Center (RSRC) Department of Biology, University of Oslo, Oslo, Norway 2011-03-31 application/pdf http://hdl.handle.net/10754/554380 https://doi.org/10.4319/lo.2011.56.3.0765 unknown Wiley http://doi.wiley.com/10.4319/lo.2011.56.3.0765 Krill (Meganyctiphanes norvegica) swim faster at night, 2011, 56 (3):765 Limnology and Oceanography doi:10.4319/lo.2011.56.3.0765 00243590 Limnology and Oceanography http://hdl.handle.net/10754/554380 Archived with thanks to Limnology and Oceanography Article 2011 ftkingabdullahun https://doi.org/10.4319/lo.2011.56.3.0765 2023-12-02T20:22:01Z 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. Article in Journal/Newspaper Meganyctiphanes norvegica King Abdullah University of Science and Technology: KAUST Repository Limnology and Oceanography 56 3 765 774 |
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Open Polar |
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King Abdullah University of Science and Technology: KAUST Repository |
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ftkingabdullahun |
language |
unknown |
description |
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. |
author2 |
Biological and Environmental Sciences and Engineering (BESE) Division Marine Science Program Red Sea Research Center (RSRC) Department of Biology, University of Oslo, Oslo, Norway |
format |
Article in Journal/Newspaper |
author |
Klevjer, Thor Aleksander Kaartvedt, Stein |
spellingShingle |
Klevjer, Thor Aleksander Kaartvedt, Stein Krill (Meganyctiphanes norvegica) swim faster at night |
author_facet |
Klevjer, Thor Aleksander Kaartvedt, Stein |
author_sort |
Klevjer, Thor Aleksander |
title |
Krill (Meganyctiphanes norvegica) swim faster at night |
title_short |
Krill (Meganyctiphanes norvegica) swim faster at night |
title_full |
Krill (Meganyctiphanes norvegica) swim faster at night |
title_fullStr |
Krill (Meganyctiphanes norvegica) swim faster at night |
title_full_unstemmed |
Krill (Meganyctiphanes norvegica) swim faster at night |
title_sort |
krill (meganyctiphanes norvegica) swim faster at night |
publisher |
Wiley |
publishDate |
2011 |
url |
http://hdl.handle.net/10754/554380 https://doi.org/10.4319/lo.2011.56.3.0765 |
genre |
Meganyctiphanes norvegica |
genre_facet |
Meganyctiphanes norvegica |
op_relation |
http://doi.wiley.com/10.4319/lo.2011.56.3.0765 Krill (Meganyctiphanes norvegica) swim faster at night, 2011, 56 (3):765 Limnology and Oceanography doi:10.4319/lo.2011.56.3.0765 00243590 Limnology and Oceanography http://hdl.handle.net/10754/554380 |
op_rights |
Archived with thanks to Limnology and Oceanography |
op_doi |
https://doi.org/10.4319/lo.2011.56.3.0765 |
container_title |
Limnology and Oceanography |
container_volume |
56 |
container_issue |
3 |
container_start_page |
765 |
op_container_end_page |
774 |
_version_ |
1786842210815180800 |