Diel vertical migration of Antarctic krill ( Euphausia superba ) is flexible during advection across the Scotia Sea
We model a summer snapshot of the behavior of Antarctic krill ( Euphausia superba ) during advection across the Scotia Sea. Individual krill respond to a changing landscape of predation risk and food availability by migrating vertically in the water column and choosing an average distance to their n...
Published in: | Journal of Plankton Research |
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Oxford Univ Press
2009
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Online Access: | https://doi.org/10.1093/plankt/fbp062 http://ecite.utas.edu.au/131155 |
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ftunivtasecite:oai:ecite.utas.edu.au:131155 2023-05-15T13:55:18+02:00 Diel vertical migration of Antarctic krill ( Euphausia superba ) is flexible during advection across the Scotia Sea Cresswell, KA Tarling, GA Thorpe, SE Burrows, MT Wiedenmann, J Mangel, M 2009 https://doi.org/10.1093/plankt/fbp062 http://ecite.utas.edu.au/131155 en eng Oxford Univ Press http://dx.doi.org/10.1093/plankt/fbp062 Cresswell, KA and Tarling, GA and Thorpe, SE and Burrows, MT and Wiedenmann, J and Mangel, M, Diel vertical migration of Antarctic krill ( Euphausia superba ) is flexible during advection across the Scotia Sea, Journal of Plankton Research, 31, (10) pp. 1265-1281. ISSN 0142-7873 (2009) [Refereed Article] http://ecite.utas.edu.au/131155 Mathematical Sciences Applied Mathematics Biological Mathematics Refereed Article PeerReviewed 2009 ftunivtasecite https://doi.org/10.1093/plankt/fbp062 2019-12-13T22:29:08Z We model a summer snapshot of the behavior of Antarctic krill ( Euphausia superba ) during advection across the Scotia Sea. Individual krill respond to a changing landscape of predation risk and food availability by migrating vertically in the water column and choosing an average distance to their nearest neighbor (swarm density). We determine the optimal behavior of 30, 40 and 50 mm krill using a state-dependent life history model where individuals move along 30-day segments of hypothetical journey tracks in three different regions of the Scotia Sea, with the tracks extracted from a combination of circulation models and surface drifter data. Food availability is based on satellite data for surface Chl a with additional heterotrophic and detritus food components, and mortality is parameterized with respect to distance from shore, daylight and krill swarming-behavior. We predict that proximity to predator colonies has a distinct effect on behavior, particularly on depth choice when food-availability is low. Observations made during an acoustic survey of the region found swarms to be deeper at the Antarctic Peninsula compared with South Georgia, in line with model predictions. Our predictions are also consistent with observations that swarm density changes little on a logarithmic scale across the region. We show that being able to change behavior on short time scales has distinct advantages to krill. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Scotia Sea eCite UTAS (University of Tasmania) Antarctic The Antarctic Antarctic Peninsula Scotia Sea Journal of Plankton Research 31 10 1265 1281 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Mathematical Sciences Applied Mathematics Biological Mathematics |
spellingShingle |
Mathematical Sciences Applied Mathematics Biological Mathematics Cresswell, KA Tarling, GA Thorpe, SE Burrows, MT Wiedenmann, J Mangel, M Diel vertical migration of Antarctic krill ( Euphausia superba ) is flexible during advection across the Scotia Sea |
topic_facet |
Mathematical Sciences Applied Mathematics Biological Mathematics |
description |
We model a summer snapshot of the behavior of Antarctic krill ( Euphausia superba ) during advection across the Scotia Sea. Individual krill respond to a changing landscape of predation risk and food availability by migrating vertically in the water column and choosing an average distance to their nearest neighbor (swarm density). We determine the optimal behavior of 30, 40 and 50 mm krill using a state-dependent life history model where individuals move along 30-day segments of hypothetical journey tracks in three different regions of the Scotia Sea, with the tracks extracted from a combination of circulation models and surface drifter data. Food availability is based on satellite data for surface Chl a with additional heterotrophic and detritus food components, and mortality is parameterized with respect to distance from shore, daylight and krill swarming-behavior. We predict that proximity to predator colonies has a distinct effect on behavior, particularly on depth choice when food-availability is low. Observations made during an acoustic survey of the region found swarms to be deeper at the Antarctic Peninsula compared with South Georgia, in line with model predictions. Our predictions are also consistent with observations that swarm density changes little on a logarithmic scale across the region. We show that being able to change behavior on short time scales has distinct advantages to krill. |
format |
Article in Journal/Newspaper |
author |
Cresswell, KA Tarling, GA Thorpe, SE Burrows, MT Wiedenmann, J Mangel, M |
author_facet |
Cresswell, KA Tarling, GA Thorpe, SE Burrows, MT Wiedenmann, J Mangel, M |
author_sort |
Cresswell, KA |
title |
Diel vertical migration of Antarctic krill ( Euphausia superba ) is flexible during advection across the Scotia Sea |
title_short |
Diel vertical migration of Antarctic krill ( Euphausia superba ) is flexible during advection across the Scotia Sea |
title_full |
Diel vertical migration of Antarctic krill ( Euphausia superba ) is flexible during advection across the Scotia Sea |
title_fullStr |
Diel vertical migration of Antarctic krill ( Euphausia superba ) is flexible during advection across the Scotia Sea |
title_full_unstemmed |
Diel vertical migration of Antarctic krill ( Euphausia superba ) is flexible during advection across the Scotia Sea |
title_sort |
diel vertical migration of antarctic krill ( euphausia superba ) is flexible during advection across the scotia sea |
publisher |
Oxford Univ Press |
publishDate |
2009 |
url |
https://doi.org/10.1093/plankt/fbp062 http://ecite.utas.edu.au/131155 |
geographic |
Antarctic The Antarctic Antarctic Peninsula Scotia Sea |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Scotia Sea |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Scotia Sea |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Scotia Sea |
op_relation |
http://dx.doi.org/10.1093/plankt/fbp062 Cresswell, KA and Tarling, GA and Thorpe, SE and Burrows, MT and Wiedenmann, J and Mangel, M, Diel vertical migration of Antarctic krill ( Euphausia superba ) is flexible during advection across the Scotia Sea, Journal of Plankton Research, 31, (10) pp. 1265-1281. ISSN 0142-7873 (2009) [Refereed Article] http://ecite.utas.edu.au/131155 |
op_doi |
https://doi.org/10.1093/plankt/fbp062 |
container_title |
Journal of Plankton Research |
container_volume |
31 |
container_issue |
10 |
container_start_page |
1265 |
op_container_end_page |
1281 |
_version_ |
1766261693890953216 |