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 nea...
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2009
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fthighwire:oai:open-archive.highwire.org:plankt:31/10/1265 2023-05-15T13:50:19+02:00 Diel vertical migration of Antarctic krill (Euphausia superba) is flexible during advection across the Scotia Sea Cresswell, Katherine A. Tarling, Geraint A. Thorpe, Sally E. Burrows, Michael T. Wiedenmann, John Mangel, Marc 2009-10-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/31/10/1265 https://doi.org/10.1093/plankt/fbp062 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/31/10/1265 http://dx.doi.org/10.1093/plankt/fbp062 Copyright (C) 2009, Oxford University Press ORIGINAL ARTICLES TEXT 2009 fthighwire https://doi.org/10.1093/plankt/fbp062 2009-11-22T20:45:33Z 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. Text Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Scotia Sea HighWire Press (Stanford University) Antarctic The Antarctic Antarctic Peninsula Scotia Sea Journal of Plankton Research 31 10 1265 1281 |
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HighWire Press (Stanford University) |
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English |
topic |
ORIGINAL ARTICLES |
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ORIGINAL ARTICLES Cresswell, Katherine A. Tarling, Geraint A. Thorpe, Sally E. Burrows, Michael T. Wiedenmann, John Mangel, Marc Diel vertical migration of Antarctic krill (Euphausia superba) is flexible during advection across the Scotia Sea |
topic_facet |
ORIGINAL ARTICLES |
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 |
Text |
author |
Cresswell, Katherine A. Tarling, Geraint A. Thorpe, Sally E. Burrows, Michael T. Wiedenmann, John Mangel, Marc |
author_facet |
Cresswell, Katherine A. Tarling, Geraint A. Thorpe, Sally E. Burrows, Michael T. Wiedenmann, John Mangel, Marc |
author_sort |
Cresswell, Katherine A. |
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 University Press |
publishDate |
2009 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/31/10/1265 https://doi.org/10.1093/plankt/fbp062 |
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://plankt.oxfordjournals.org/cgi/content/short/31/10/1265 http://dx.doi.org/10.1093/plankt/fbp062 |
op_rights |
Copyright (C) 2009, Oxford University Press |
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_ |
1766253346167980032 |