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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ftciteseerx:oai:CiteSeerX.psu:10.1.1.158.390 2023-05-15T13:51:32+02:00 advection across the Scotia Sea Katherine A. Cresswell Geraint A. Tarling Sally E. Thorpe Michael T. Burrows John Wiedenmann Marc Mangel The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.158.390 http://www.soe.ucsc.edu/~msmangel/Cresswell%20et%20al%202009.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.158.390 http://www.soe.ucsc.edu/~msmangel/Cresswell%20et%20al%202009.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.soe.ucsc.edu/~msmangel/Cresswell%20et%20al%202009.pdf text ftciteseerx 2016-01-07T15:35:19Z 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 Unknown Antarctic Antarctic Peninsula Scotia Sea The Antarctic |
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English |
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. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Katherine A. Cresswell Geraint A. Tarling Sally E. Thorpe Michael T. Burrows John Wiedenmann Marc Mangel |
spellingShingle |
Katherine A. Cresswell Geraint A. Tarling Sally E. Thorpe Michael T. Burrows John Wiedenmann Marc Mangel advection across the Scotia Sea |
author_facet |
Katherine A. Cresswell Geraint A. Tarling Sally E. Thorpe Michael T. Burrows John Wiedenmann Marc Mangel |
author_sort |
Katherine A. Cresswell |
title |
advection across the Scotia Sea |
title_short |
advection across the Scotia Sea |
title_full |
advection across the Scotia Sea |
title_fullStr |
advection across the Scotia Sea |
title_full_unstemmed |
advection across the Scotia Sea |
title_sort |
advection across the scotia sea |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.158.390 http://www.soe.ucsc.edu/~msmangel/Cresswell%20et%20al%202009.pdf |
geographic |
Antarctic Antarctic Peninsula Scotia Sea The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Scotia Sea The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Scotia Sea |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Scotia Sea |
op_source |
http://www.soe.ucsc.edu/~msmangel/Cresswell%20et%20al%202009.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.158.390 http://www.soe.ucsc.edu/~msmangel/Cresswell%20et%20al%202009.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766255439619555328 |