Acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals
Knowledge of the diet of marine mammals is fundamental to understanding their role in marine ecosystems and response to environmental change. Recently, animal-borne video cameras have revealed the diet of marine mammals that make short foraging trips. However, novel approaches that allocate video ti...
Published in: | Journal of Experimental Biology |
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Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2020
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Online Access: | https://research-portal.st-andrews.ac.uk/en/publications/be6ea056-5908-4b69-83d0-8f5daf1533f8 https://doi.org/10.1242/jeb.212936 https://research-repository.st-andrews.ac.uk/bitstream/10023/21523/1/Yoshino_2020_JEB_Animal_borne_FinalPubVersion.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/be6ea056-5908-4b69-83d0-8f5daf1533f8 2024-10-13T14:06:56+00:00 Acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals Yoshino, Kaori Takahashi, Akinori Adachi, Taiki Costa, Daniel P. Robinson, Patrick W. Peterson, Sarah H. Hückstädt, Luis A. Holser, Rachel R. Naito, Yasuhiko 2020-02-28 application/pdf https://research-portal.st-andrews.ac.uk/en/publications/be6ea056-5908-4b69-83d0-8f5daf1533f8 https://doi.org/10.1242/jeb.212936 https://research-repository.st-andrews.ac.uk/bitstream/10023/21523/1/Yoshino_2020_JEB_Animal_borne_FinalPubVersion.pdf eng eng https://research-portal.st-andrews.ac.uk/en/publications/be6ea056-5908-4b69-83d0-8f5daf1533f8 info:eu-repo/semantics/openAccess Yoshino , K , Takahashi , A , Adachi , T , Costa , D P , Robinson , P W , Peterson , S H , Hückstädt , L A , Holser , R R & Naito , Y 2020 , ' Acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals ' , Journal of Experimental Biology , vol. 223 , no. 5 , jeb212936 . https://doi.org/10.1242/jeb.212936 Bio-logging Diving behavior Foraging Marine mammal Mesopelagic zone article 2020 ftunstandrewcris https://doi.org/10.1242/jeb.212936 2024-09-18T23:42:20Z Knowledge of the diet of marine mammals is fundamental to understanding their role in marine ecosystems and response to environmental change. Recently, animal-borne video cameras have revealed the diet of marine mammals that make short foraging trips. However, novel approaches that allocate video time to target prey capture events is required to obtain diet information for species that make long foraging trips over great distances. We combined satellite telemetry and depth recorders with newly developed date-/time-, depth- and acceleration-triggered animal-borne video cameras to examine the diet of female northern elephant seals during their foraging migrations across the eastern North Pacific. We obtained 48.2 h of underwater video, from cameras mounted on the head (n=12) and jaw (n=3) of seals. Fish dominated the diet (78% of 697 prey items recorded) across all foraging locations (range: 37-55°N, 122-152°W), diving depths (range: 238-1167 m) and water temperatures (range: 3.2-7.4°C), while squid comprised only 7% of the diet. Identified prey included fish such as myctophids, Merluccius sp. and Icosteus aenigmaticus, and squid such as Histioteuthis sp., Octopoteuthis sp. and Taningia danae Our results corroborate fatty acid analysis, which also found that fish are more important in the diet, and are in contrast to stomach content analyses that found cephalopods to be the most important component of the diet. Our work shows that in situ video observation is a useful method for studying the at-sea diet of long-ranging marine predators. Article in Journal/Newspaper Elephant Seals University of St Andrews: Research Portal Pacific Journal of Experimental Biology |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Bio-logging Diving behavior Foraging Marine mammal Mesopelagic zone |
spellingShingle |
Bio-logging Diving behavior Foraging Marine mammal Mesopelagic zone Yoshino, Kaori Takahashi, Akinori Adachi, Taiki Costa, Daniel P. Robinson, Patrick W. Peterson, Sarah H. Hückstädt, Luis A. Holser, Rachel R. Naito, Yasuhiko Acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals |
topic_facet |
Bio-logging Diving behavior Foraging Marine mammal Mesopelagic zone |
description |
Knowledge of the diet of marine mammals is fundamental to understanding their role in marine ecosystems and response to environmental change. Recently, animal-borne video cameras have revealed the diet of marine mammals that make short foraging trips. However, novel approaches that allocate video time to target prey capture events is required to obtain diet information for species that make long foraging trips over great distances. We combined satellite telemetry and depth recorders with newly developed date-/time-, depth- and acceleration-triggered animal-borne video cameras to examine the diet of female northern elephant seals during their foraging migrations across the eastern North Pacific. We obtained 48.2 h of underwater video, from cameras mounted on the head (n=12) and jaw (n=3) of seals. Fish dominated the diet (78% of 697 prey items recorded) across all foraging locations (range: 37-55°N, 122-152°W), diving depths (range: 238-1167 m) and water temperatures (range: 3.2-7.4°C), while squid comprised only 7% of the diet. Identified prey included fish such as myctophids, Merluccius sp. and Icosteus aenigmaticus, and squid such as Histioteuthis sp., Octopoteuthis sp. and Taningia danae Our results corroborate fatty acid analysis, which also found that fish are more important in the diet, and are in contrast to stomach content analyses that found cephalopods to be the most important component of the diet. Our work shows that in situ video observation is a useful method for studying the at-sea diet of long-ranging marine predators. |
format |
Article in Journal/Newspaper |
author |
Yoshino, Kaori Takahashi, Akinori Adachi, Taiki Costa, Daniel P. Robinson, Patrick W. Peterson, Sarah H. Hückstädt, Luis A. Holser, Rachel R. Naito, Yasuhiko |
author_facet |
Yoshino, Kaori Takahashi, Akinori Adachi, Taiki Costa, Daniel P. Robinson, Patrick W. Peterson, Sarah H. Hückstädt, Luis A. Holser, Rachel R. Naito, Yasuhiko |
author_sort |
Yoshino, Kaori |
title |
Acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals |
title_short |
Acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals |
title_full |
Acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals |
title_fullStr |
Acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals |
title_full_unstemmed |
Acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals |
title_sort |
acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals |
publishDate |
2020 |
url |
https://research-portal.st-andrews.ac.uk/en/publications/be6ea056-5908-4b69-83d0-8f5daf1533f8 https://doi.org/10.1242/jeb.212936 https://research-repository.st-andrews.ac.uk/bitstream/10023/21523/1/Yoshino_2020_JEB_Animal_borne_FinalPubVersion.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Elephant Seals |
genre_facet |
Elephant Seals |
op_source |
Yoshino , K , Takahashi , A , Adachi , T , Costa , D P , Robinson , P W , Peterson , S H , Hückstädt , L A , Holser , R R & Naito , Y 2020 , ' Acceleration-triggered animal-borne videos show a dominance of fish in the diet of female northern elephant seals ' , Journal of Experimental Biology , vol. 223 , no. 5 , jeb212936 . https://doi.org/10.1242/jeb.212936 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/publications/be6ea056-5908-4b69-83d0-8f5daf1533f8 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1242/jeb.212936 |
container_title |
Journal of Experimental Biology |
_version_ |
1812813189884149760 |