Fishing for drifts:detecting buoyancy changes of a top marine predator using a step-wise filtering method
In southern elephant seals ( Mirounga leonina ), fasting and foraging related fluctuations in body composition are reflected by buoyancy changes which can be monitored by changes in drift rate. Here, we present an improved knowledge-based method for detecting buoyancy changes from compressed and abs...
Published in: | Journal of Experimental Biology |
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Language: | English |
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2015
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/fishing-for-drifts(33f3e6f1-867e-4b92-ac12-4bf069552d3a).html https://doi.org/10.1242/jeb.118109 https://research-repository.st-andrews.ac.uk/bitstream/10023/7923/1/Gordine_JEB218_3816_CCBY.pdf http://www.smru.st-andrews.ac.uk/Instrumentation/Overview/ |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/33f3e6f1-867e-4b92-ac12-4bf069552d3a 2024-06-23T07:52:28+00:00 Fishing for drifts:detecting buoyancy changes of a top marine predator using a step-wise filtering method Gordine, Samantha Alex Fedak, Mike Boehme, Lars 2015-12-02 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/fishing-for-drifts(33f3e6f1-867e-4b92-ac12-4bf069552d3a).html https://doi.org/10.1242/jeb.118109 https://research-repository.st-andrews.ac.uk/bitstream/10023/7923/1/Gordine_JEB218_3816_CCBY.pdf http://www.smru.st-andrews.ac.uk/Instrumentation/Overview/ eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/fishing-for-drifts(33f3e6f1-867e-4b92-ac12-4bf069552d3a).html info:eu-repo/semantics/openAccess Gordine , S A , Fedak , M & Boehme , L 2015 , ' Fishing for drifts : detecting buoyancy changes of a top marine predator using a step-wise filtering method ' , Journal of Experimental Biology , vol. 218 , no. 23 , pp. 3816-3824 . https://doi.org/10.1242/jeb.118109 Buoyancy Marine mammal Elephant seal Body composition Drift diving Telemetry Foraging ecology Diving behaviour article 2015 ftunstandrewcris https://doi.org/10.1242/jeb.118109 2024-06-13T00:46:22Z In southern elephant seals ( Mirounga leonina ), fasting and foraging related fluctuations in body composition are reflected by buoyancy changes which can be monitored by changes in drift rate. Here, we present an improved knowledge-based method for detecting buoyancy changes from compressed and abstracted dive profiles received through telemetry. We applied this step-wise filtering method to the dive records of 11 southern elephant seals, which identified 0.8% to 2.2% of all dives as drift dives. At the beginning of the migration, all individuals were strongly negatively buoyant. Over the following 75 to 150 days, the buoyancy reached a peak close to or at neutral buoyancy, indicative of a seal’s foraging success. Ground-truthing confirmed that this new knowledge-based method is capable to reliably detect buoyancy changes in the dive records of drift diving species using abstracted dive profiles. This affirms that the abstraction algorithm conveys sufficient detail of the geometric shape of drift dives for them to be identified. It also suggest that using this step-wise filtering method, buoyancy changes could be detected even in old datasets with compressed dive information, for which conventional drift dive classification previously failed. Article in Journal/Newspaper Elephant Seal Elephant Seals Mirounga leonina Southern Elephant Seals University of St Andrews: Research Portal Journal of Experimental Biology |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Buoyancy Marine mammal Elephant seal Body composition Drift diving Telemetry Foraging ecology Diving behaviour |
spellingShingle |
Buoyancy Marine mammal Elephant seal Body composition Drift diving Telemetry Foraging ecology Diving behaviour Gordine, Samantha Alex Fedak, Mike Boehme, Lars Fishing for drifts:detecting buoyancy changes of a top marine predator using a step-wise filtering method |
topic_facet |
Buoyancy Marine mammal Elephant seal Body composition Drift diving Telemetry Foraging ecology Diving behaviour |
description |
In southern elephant seals ( Mirounga leonina ), fasting and foraging related fluctuations in body composition are reflected by buoyancy changes which can be monitored by changes in drift rate. Here, we present an improved knowledge-based method for detecting buoyancy changes from compressed and abstracted dive profiles received through telemetry. We applied this step-wise filtering method to the dive records of 11 southern elephant seals, which identified 0.8% to 2.2% of all dives as drift dives. At the beginning of the migration, all individuals were strongly negatively buoyant. Over the following 75 to 150 days, the buoyancy reached a peak close to or at neutral buoyancy, indicative of a seal’s foraging success. Ground-truthing confirmed that this new knowledge-based method is capable to reliably detect buoyancy changes in the dive records of drift diving species using abstracted dive profiles. This affirms that the abstraction algorithm conveys sufficient detail of the geometric shape of drift dives for them to be identified. It also suggest that using this step-wise filtering method, buoyancy changes could be detected even in old datasets with compressed dive information, for which conventional drift dive classification previously failed. |
format |
Article in Journal/Newspaper |
author |
Gordine, Samantha Alex Fedak, Mike Boehme, Lars |
author_facet |
Gordine, Samantha Alex Fedak, Mike Boehme, Lars |
author_sort |
Gordine, Samantha Alex |
title |
Fishing for drifts:detecting buoyancy changes of a top marine predator using a step-wise filtering method |
title_short |
Fishing for drifts:detecting buoyancy changes of a top marine predator using a step-wise filtering method |
title_full |
Fishing for drifts:detecting buoyancy changes of a top marine predator using a step-wise filtering method |
title_fullStr |
Fishing for drifts:detecting buoyancy changes of a top marine predator using a step-wise filtering method |
title_full_unstemmed |
Fishing for drifts:detecting buoyancy changes of a top marine predator using a step-wise filtering method |
title_sort |
fishing for drifts:detecting buoyancy changes of a top marine predator using a step-wise filtering method |
publishDate |
2015 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/fishing-for-drifts(33f3e6f1-867e-4b92-ac12-4bf069552d3a).html https://doi.org/10.1242/jeb.118109 https://research-repository.st-andrews.ac.uk/bitstream/10023/7923/1/Gordine_JEB218_3816_CCBY.pdf http://www.smru.st-andrews.ac.uk/Instrumentation/Overview/ |
genre |
Elephant Seal Elephant Seals Mirounga leonina Southern Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals Mirounga leonina Southern Elephant Seals |
op_source |
Gordine , S A , Fedak , M & Boehme , L 2015 , ' Fishing for drifts : detecting buoyancy changes of a top marine predator using a step-wise filtering method ' , Journal of Experimental Biology , vol. 218 , no. 23 , pp. 3816-3824 . https://doi.org/10.1242/jeb.118109 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/fishing-for-drifts(33f3e6f1-867e-4b92-ac12-4bf069552d3a).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1242/jeb.118109 |
container_title |
Journal of Experimental Biology |
_version_ |
1802643778673049600 |