Dispersal of female southern elephant seals and their prey consumption during the austral summer: relevance to management and oceanographic zones
© 2003 British Ecological Society <jats:title>Summary</jats:title><jats:p> <jats:list list-type="explicit-label"> <jats:list-item><jats:p>Numerical models that predict trophic structure require both accurate information on prey consumption rates and esti...
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Language: | English |
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Blackwell Publishing Ltd
2003
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Online Access: | http://hdl.handle.net/2440/48204 https://doi.org/10.1046/j.1365-2664.2003.00832.x |
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/48204 2023-11-12T04:06:33+01:00 Dispersal of female southern elephant seals and their prey consumption during the austral summer: relevance to management and oceanographic zones Hindell, M. Bradshaw, C. Sumner, M. Michael, K. Burton, H. 2003 http://hdl.handle.net/2440/48204 https://doi.org/10.1046/j.1365-2664.2003.00832.x en eng Blackwell Publishing Ltd Journal of Applied Ecology, 2003; 40(4):703-715 0021-8901 1365-2664 http://hdl.handle.net/2440/48204 doi:10.1046/j.1365-2664.2003.00832.x Bradshaw, C. [0000-0002-5328-7741] http://www3.interscience.wiley.com/journal/118869687/abstract bootstrap models Mirounga leonina seal management spatial power Journal article 2003 ftunivadelaidedl https://doi.org/10.1046/j.1365-2664.2003.00832.x 2023-10-23T22:15:28Z © 2003 British Ecological Society <jats:title>Summary</jats:title><jats:p> <jats:list list-type="explicit-label"> <jats:list-item><jats:p>Numerical models that predict trophic structure require both accurate information on prey consumption rates and estimates of spatial and temporal variation. In the Southern Ocean little information exists on the spatial and temporal patterns of resource use by predators, so we attempted to examine these patterns for an important Antarctic predator, the southern elephant seal. We (i) defined the area of the ocean used by the adult female component of the elephant seal population at Macquarie Island; (ii) quantified the time these seals spent in the different regions of the Southern Ocean; and (iii) estimated the biomass of fish and squid prey consumed per fortnight and per region.</jats:p></jats:list-item> <jats:list-item><jats:p>We used data from 42 post‐breeding females collected from 1992 to 2001. The data consisted of locations determined by geo‐location (based on light intensity) recorded using dataloggers. A randomized, incremental analysis of at‐sea locations indicated that a sample of 25 individuals was required to provide 95% coverage of the total area of ocean used.</jats:p></jats:list-item> <jats:list-item><jats:p>The greatest amount of time (44·6%) was spent in the region between the Antarctic Polar Front (APF) and the Subantarctic Front (SAF). Up to 20% of time was spent south of the Antarctic Circle or within Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) Statistical Subareas, indicating that seals from Macquarie Island are also important summer‐time predators in high Antarctic waters.</jats:p></jats:list-item> <jats:list-item><jats:p>The adult female population was estimated to consume 122·73–125·81 × 10<jats:sup>6</jats:sup> MJ for the post‐lactation foraging trip (31 142–31 925 tonnes of prey). Of this, ... Article in Journal/Newspaper Antarc* Antarctic Elephant Seal Elephant Seals Macquarie Island Mirounga leonina Southern Elephant Seal Southern Elephant Seals Southern Ocean The University of Adelaide: Digital Library Antarctic Southern Ocean The Antarctic Austral Journal of Applied Ecology 40 4 703 715 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
topic |
bootstrap models Mirounga leonina seal management spatial power |
spellingShingle |
bootstrap models Mirounga leonina seal management spatial power Hindell, M. Bradshaw, C. Sumner, M. Michael, K. Burton, H. Dispersal of female southern elephant seals and their prey consumption during the austral summer: relevance to management and oceanographic zones |
topic_facet |
bootstrap models Mirounga leonina seal management spatial power |
description |
© 2003 British Ecological Society <jats:title>Summary</jats:title><jats:p> <jats:list list-type="explicit-label"> <jats:list-item><jats:p>Numerical models that predict trophic structure require both accurate information on prey consumption rates and estimates of spatial and temporal variation. In the Southern Ocean little information exists on the spatial and temporal patterns of resource use by predators, so we attempted to examine these patterns for an important Antarctic predator, the southern elephant seal. We (i) defined the area of the ocean used by the adult female component of the elephant seal population at Macquarie Island; (ii) quantified the time these seals spent in the different regions of the Southern Ocean; and (iii) estimated the biomass of fish and squid prey consumed per fortnight and per region.</jats:p></jats:list-item> <jats:list-item><jats:p>We used data from 42 post‐breeding females collected from 1992 to 2001. The data consisted of locations determined by geo‐location (based on light intensity) recorded using dataloggers. A randomized, incremental analysis of at‐sea locations indicated that a sample of 25 individuals was required to provide 95% coverage of the total area of ocean used.</jats:p></jats:list-item> <jats:list-item><jats:p>The greatest amount of time (44·6%) was spent in the region between the Antarctic Polar Front (APF) and the Subantarctic Front (SAF). Up to 20% of time was spent south of the Antarctic Circle or within Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) Statistical Subareas, indicating that seals from Macquarie Island are also important summer‐time predators in high Antarctic waters.</jats:p></jats:list-item> <jats:list-item><jats:p>The adult female population was estimated to consume 122·73–125·81 × 10<jats:sup>6</jats:sup> MJ for the post‐lactation foraging trip (31 142–31 925 tonnes of prey). Of this, ... |
format |
Article in Journal/Newspaper |
author |
Hindell, M. Bradshaw, C. Sumner, M. Michael, K. Burton, H. |
author_facet |
Hindell, M. Bradshaw, C. Sumner, M. Michael, K. Burton, H. |
author_sort |
Hindell, M. |
title |
Dispersal of female southern elephant seals and their prey consumption during the austral summer: relevance to management and oceanographic zones |
title_short |
Dispersal of female southern elephant seals and their prey consumption during the austral summer: relevance to management and oceanographic zones |
title_full |
Dispersal of female southern elephant seals and their prey consumption during the austral summer: relevance to management and oceanographic zones |
title_fullStr |
Dispersal of female southern elephant seals and their prey consumption during the austral summer: relevance to management and oceanographic zones |
title_full_unstemmed |
Dispersal of female southern elephant seals and their prey consumption during the austral summer: relevance to management and oceanographic zones |
title_sort |
dispersal of female southern elephant seals and their prey consumption during the austral summer: relevance to management and oceanographic zones |
publisher |
Blackwell Publishing Ltd |
publishDate |
2003 |
url |
http://hdl.handle.net/2440/48204 https://doi.org/10.1046/j.1365-2664.2003.00832.x |
geographic |
Antarctic Southern Ocean The Antarctic Austral |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral |
genre |
Antarc* Antarctic Elephant Seal Elephant Seals Macquarie Island Mirounga leonina Southern Elephant Seal Southern Elephant Seals Southern Ocean |
genre_facet |
Antarc* Antarctic Elephant Seal Elephant Seals Macquarie Island Mirounga leonina Southern Elephant Seal Southern Elephant Seals Southern Ocean |
op_source |
http://www3.interscience.wiley.com/journal/118869687/abstract |
op_relation |
Journal of Applied Ecology, 2003; 40(4):703-715 0021-8901 1365-2664 http://hdl.handle.net/2440/48204 doi:10.1046/j.1365-2664.2003.00832.x Bradshaw, C. [0000-0002-5328-7741] |
op_doi |
https://doi.org/10.1046/j.1365-2664.2003.00832.x |
container_title |
Journal of Applied Ecology |
container_volume |
40 |
container_issue |
4 |
container_start_page |
703 |
op_container_end_page |
715 |
_version_ |
1782327653760499712 |