At-sea distribution of female southern elephant seals relative to variation in ocean surface properties
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer We examined the relationships between physical oceanography (sea surface temperature – SST, sea surface height anomaly – SSH, ocean colour – OC, bathymetry – BA, sea-ice c...
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Language: | English |
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Academic Press Ltd Elsevier Science Ltd
2004
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Online Access: | http://hdl.handle.net/2440/48215 https://doi.org/10.1016/j.icesjms.2004.07.012 |
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/48215 2023-05-15T16:05:36+02:00 At-sea distribution of female southern elephant seals relative to variation in ocean surface properties Bradshaw, C. Higgins, J. Michael, K. Wotherspoon, S. Hindell, M. 2004 http://hdl.handle.net/2440/48215 https://doi.org/10.1016/j.icesjms.2004.07.012 en eng Academic Press Ltd Elsevier Science Ltd ICES Journal of Marine Science: journal du conseil, 2004; 61(6):1014-1027 1054-3139 1095-9289 http://hdl.handle.net/2440/48215 doi:10.1016/j.icesjms.2004.07.012 Bradshaw, C. [0000-0002-5328-7741] http://icesjms.oxfordjournals.org/cgi/content/full/61/6/1014 bathymetry elephant seals environmental variation generalized additive model generalized linear model oceanography sea surface temperature Journal article 2004 ftunivadelaidedl https://doi.org/10.1016/j.icesjms.2004.07.012 2023-02-05T19:32:01Z © 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer We examined the relationships between physical oceanography (sea surface temperature – SST, sea surface height anomaly – SSH, ocean colour – OC, bathymetry – BA, sea-ice concentration – SI, and their associated gradients) and the foraging distribution (time at sea) of female southern elephant seals using generalized linear and generalized additive models (GLM and GAM). Using data from 28 separate foraging trips (22 unique individuals) over two years, we found that during the post-lactation trips (summer), the best GLM demonstrated a negative relationship between time at sea and SST and BA, but a positive relationship with SST gradient and SSH. During the post-moult (winter) trips, there was a negative relationship with OC gradient, SSH, and BA. The best post-lactation GAM identified a positive relationship with OC gradient, negative relationships with OC and SST gradient, and a non-linear relationship with SST. For the post-moult trip there was a negative relationship with OC, SST, BA and BA gradient, and a positive relationship with SST gradient. The relationship between the predicted time and observed time at sea was significant only for the post-lactation GAM, although predictability was low. That SST and its gradient predicted a small, but significant proportion of the variation in time at sea is indicative of the frontal zones within this area that are generally more biologically productive than surrounding regions. It appears that coarse-scale oceanographic configuration influences foraging behaviour in southern elephant seals only subtly. Nonetheless, some of the mechanisms influencing predator foraging are congruent with expectations of distribution of marine food resources at coarse spatial scales. Corey J.A. Bradshaw, Jane Higgins, Kelvin J. Michael, Simon J. Wotherspoon and Mark A. Hindell Article in Journal/Newspaper Elephant Seals Sea ice Southern Elephant Seals The University of Adelaide: Digital Library Bradshaw ENVELOPE(163.867,163.867,-71.467,-71.467) Conseil ENVELOPE(-67.433,-67.433,-67.596,-67.596) Corey ENVELOPE(-145.133,-145.133,-76.667,-76.667) Gam ENVELOPE(-57.955,-57.955,-61.923,-61.923) ICES Journal of Marine Science 61 6 1014 1027 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
topic |
bathymetry elephant seals environmental variation generalized additive model generalized linear model oceanography sea surface temperature |
spellingShingle |
bathymetry elephant seals environmental variation generalized additive model generalized linear model oceanography sea surface temperature Bradshaw, C. Higgins, J. Michael, K. Wotherspoon, S. Hindell, M. At-sea distribution of female southern elephant seals relative to variation in ocean surface properties |
topic_facet |
bathymetry elephant seals environmental variation generalized additive model generalized linear model oceanography sea surface temperature |
description |
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer We examined the relationships between physical oceanography (sea surface temperature – SST, sea surface height anomaly – SSH, ocean colour – OC, bathymetry – BA, sea-ice concentration – SI, and their associated gradients) and the foraging distribution (time at sea) of female southern elephant seals using generalized linear and generalized additive models (GLM and GAM). Using data from 28 separate foraging trips (22 unique individuals) over two years, we found that during the post-lactation trips (summer), the best GLM demonstrated a negative relationship between time at sea and SST and BA, but a positive relationship with SST gradient and SSH. During the post-moult (winter) trips, there was a negative relationship with OC gradient, SSH, and BA. The best post-lactation GAM identified a positive relationship with OC gradient, negative relationships with OC and SST gradient, and a non-linear relationship with SST. For the post-moult trip there was a negative relationship with OC, SST, BA and BA gradient, and a positive relationship with SST gradient. The relationship between the predicted time and observed time at sea was significant only for the post-lactation GAM, although predictability was low. That SST and its gradient predicted a small, but significant proportion of the variation in time at sea is indicative of the frontal zones within this area that are generally more biologically productive than surrounding regions. It appears that coarse-scale oceanographic configuration influences foraging behaviour in southern elephant seals only subtly. Nonetheless, some of the mechanisms influencing predator foraging are congruent with expectations of distribution of marine food resources at coarse spatial scales. Corey J.A. Bradshaw, Jane Higgins, Kelvin J. Michael, Simon J. Wotherspoon and Mark A. Hindell |
format |
Article in Journal/Newspaper |
author |
Bradshaw, C. Higgins, J. Michael, K. Wotherspoon, S. Hindell, M. |
author_facet |
Bradshaw, C. Higgins, J. Michael, K. Wotherspoon, S. Hindell, M. |
author_sort |
Bradshaw, C. |
title |
At-sea distribution of female southern elephant seals relative to variation in ocean surface properties |
title_short |
At-sea distribution of female southern elephant seals relative to variation in ocean surface properties |
title_full |
At-sea distribution of female southern elephant seals relative to variation in ocean surface properties |
title_fullStr |
At-sea distribution of female southern elephant seals relative to variation in ocean surface properties |
title_full_unstemmed |
At-sea distribution of female southern elephant seals relative to variation in ocean surface properties |
title_sort |
at-sea distribution of female southern elephant seals relative to variation in ocean surface properties |
publisher |
Academic Press Ltd Elsevier Science Ltd |
publishDate |
2004 |
url |
http://hdl.handle.net/2440/48215 https://doi.org/10.1016/j.icesjms.2004.07.012 |
long_lat |
ENVELOPE(163.867,163.867,-71.467,-71.467) ENVELOPE(-67.433,-67.433,-67.596,-67.596) ENVELOPE(-145.133,-145.133,-76.667,-76.667) ENVELOPE(-57.955,-57.955,-61.923,-61.923) |
geographic |
Bradshaw Conseil Corey Gam |
geographic_facet |
Bradshaw Conseil Corey Gam |
genre |
Elephant Seals Sea ice Southern Elephant Seals |
genre_facet |
Elephant Seals Sea ice Southern Elephant Seals |
op_source |
http://icesjms.oxfordjournals.org/cgi/content/full/61/6/1014 |
op_relation |
ICES Journal of Marine Science: journal du conseil, 2004; 61(6):1014-1027 1054-3139 1095-9289 http://hdl.handle.net/2440/48215 doi:10.1016/j.icesjms.2004.07.012 Bradshaw, C. [0000-0002-5328-7741] |
op_doi |
https://doi.org/10.1016/j.icesjms.2004.07.012 |
container_title |
ICES Journal of Marine Science |
container_volume |
61 |
container_issue |
6 |
container_start_page |
1014 |
op_container_end_page |
1027 |
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1766401494406397952 |