Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags.
There is increasing interest in the diving behavior of marine mammals. However, identifying foraging among recorded dives often requires several assumptions. The simultaneous acquisition of images of the prey encountered, together with records of diving behavior will allow researchers to more fully...
Published in: | Marine Mammal Science |
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Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2002
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/monitoring-the-preyfield-of-marine-predators-combining-digital-imaging-with-datalogging-tags(d783edda-9ce8-4b8f-9e18-975aaaf5131a).html https://doi.org/10.1111/j.1748-7692.2002.tb01066.x http://www.scopus.com/inward/record.url?scp=0036297438&partnerID=8YFLogxK |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/d783edda-9ce8-4b8f-9e18-975aaaf5131a 2023-05-15T13:45:52+02:00 Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. Hooker, Sascha Kate Boyd, Ian Lamont Jessop, M Cox, O Blackwell, J Boveng, PL Bengtson, JL 2002-07 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/monitoring-the-preyfield-of-marine-predators-combining-digital-imaging-with-datalogging-tags(d783edda-9ce8-4b8f-9e18-975aaaf5131a).html https://doi.org/10.1111/j.1748-7692.2002.tb01066.x http://www.scopus.com/inward/record.url?scp=0036297438&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Hooker , S K , Boyd , I L , Jessop , M , Cox , O , Blackwell , J , Boveng , PL & Bengtson , JL 2002 , ' Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. ' , Marine Mammal Science , vol. 18 , no. 3 , pp. 680-697 . https://doi.org/10.1111/j.1748-7692.2002.tb01066.x Antarctic fur seal Arctocephalus gazella digital imaging diving behavior foraging time-depth recorder ANTARCTIC FUR SEALS NORTHERN ELEPHANT SEALS INTERANNUAL VARIABILITY ARCTOCEPHALUS-GAZELLA FORAGING BEHAVIOR SOUTH GEORGIA HABITAT KRILL DEPTH article 2002 ftunstandrewcris https://doi.org/10.1111/j.1748-7692.2002.tb01066.x 2021-12-26T14:10:42Z There is increasing interest in the diving behavior of marine mammals. However, identifying foraging among recorded dives often requires several assumptions. The simultaneous acquisition of images of the prey encountered, together with records of diving behavior will allow researchers to more fully investigate the nature of subsurface behavior. We tested a novel digital camera linked to a time-depth recorder on Antarctic fur seals (Arctocephalus gazella). During the austral summer 2000-2001, this system was deployed on six lactating female fur seals at Bird Island, South Georgia, each for a single foraging trip. The camera was triggered at depths greater than 10 m. Five deployments recorded still images (640 X 480 pixels) at 3-sec intervals (total 8,288 images), the other recorded movie images at 0.2-sec intervals (total 7,598 frames). Memory limitation (64 MB) restricted sampling to approximately 1.5 d of 5-7 d foraging trips. An average of 8.5% of still pictures (2.4%-11.6%) showed krill (Euphausia superba) distinctly, while at least half the images in each deployment were empty, the remainder containing blurred or indistinct prey, In one deployment krill images were recorded within 2.5 h (16 km, assuming 1.8 m/sec travel speed) of leaving the beach. Five of the six deployments also showed other fur seals foraging in conjunction with the study animal. This system is likely to generate exciting new avenues for interpretation of diving behavior. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella Bird Island Elephant Seals Euphausia superba University of St Andrews: Research Portal Antarctic Austral Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Marine Mammal Science 18 3 680 697 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Antarctic fur seal Arctocephalus gazella digital imaging diving behavior foraging time-depth recorder ANTARCTIC FUR SEALS NORTHERN ELEPHANT SEALS INTERANNUAL VARIABILITY ARCTOCEPHALUS-GAZELLA FORAGING BEHAVIOR SOUTH GEORGIA HABITAT KRILL DEPTH |
spellingShingle |
Antarctic fur seal Arctocephalus gazella digital imaging diving behavior foraging time-depth recorder ANTARCTIC FUR SEALS NORTHERN ELEPHANT SEALS INTERANNUAL VARIABILITY ARCTOCEPHALUS-GAZELLA FORAGING BEHAVIOR SOUTH GEORGIA HABITAT KRILL DEPTH Hooker, Sascha Kate Boyd, Ian Lamont Jessop, M Cox, O Blackwell, J Boveng, PL Bengtson, JL Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. |
topic_facet |
Antarctic fur seal Arctocephalus gazella digital imaging diving behavior foraging time-depth recorder ANTARCTIC FUR SEALS NORTHERN ELEPHANT SEALS INTERANNUAL VARIABILITY ARCTOCEPHALUS-GAZELLA FORAGING BEHAVIOR SOUTH GEORGIA HABITAT KRILL DEPTH |
description |
There is increasing interest in the diving behavior of marine mammals. However, identifying foraging among recorded dives often requires several assumptions. The simultaneous acquisition of images of the prey encountered, together with records of diving behavior will allow researchers to more fully investigate the nature of subsurface behavior. We tested a novel digital camera linked to a time-depth recorder on Antarctic fur seals (Arctocephalus gazella). During the austral summer 2000-2001, this system was deployed on six lactating female fur seals at Bird Island, South Georgia, each for a single foraging trip. The camera was triggered at depths greater than 10 m. Five deployments recorded still images (640 X 480 pixels) at 3-sec intervals (total 8,288 images), the other recorded movie images at 0.2-sec intervals (total 7,598 frames). Memory limitation (64 MB) restricted sampling to approximately 1.5 d of 5-7 d foraging trips. An average of 8.5% of still pictures (2.4%-11.6%) showed krill (Euphausia superba) distinctly, while at least half the images in each deployment were empty, the remainder containing blurred or indistinct prey, In one deployment krill images were recorded within 2.5 h (16 km, assuming 1.8 m/sec travel speed) of leaving the beach. Five of the six deployments also showed other fur seals foraging in conjunction with the study animal. This system is likely to generate exciting new avenues for interpretation of diving behavior. |
format |
Article in Journal/Newspaper |
author |
Hooker, Sascha Kate Boyd, Ian Lamont Jessop, M Cox, O Blackwell, J Boveng, PL Bengtson, JL |
author_facet |
Hooker, Sascha Kate Boyd, Ian Lamont Jessop, M Cox, O Blackwell, J Boveng, PL Bengtson, JL |
author_sort |
Hooker, Sascha Kate |
title |
Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. |
title_short |
Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. |
title_full |
Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. |
title_fullStr |
Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. |
title_full_unstemmed |
Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. |
title_sort |
monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. |
publishDate |
2002 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/monitoring-the-preyfield-of-marine-predators-combining-digital-imaging-with-datalogging-tags(d783edda-9ce8-4b8f-9e18-975aaaf5131a).html https://doi.org/10.1111/j.1748-7692.2002.tb01066.x http://www.scopus.com/inward/record.url?scp=0036297438&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Antarctic Austral Bird Island |
geographic_facet |
Antarctic Austral Bird Island |
genre |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella Bird Island Elephant Seals Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella Bird Island Elephant Seals Euphausia superba |
op_source |
Hooker , S K , Boyd , I L , Jessop , M , Cox , O , Blackwell , J , Boveng , PL & Bengtson , JL 2002 , ' Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. ' , Marine Mammal Science , vol. 18 , no. 3 , pp. 680-697 . https://doi.org/10.1111/j.1748-7692.2002.tb01066.x |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/j.1748-7692.2002.tb01066.x |
container_title |
Marine Mammal Science |
container_volume |
18 |
container_issue |
3 |
container_start_page |
680 |
op_container_end_page |
697 |
_version_ |
1766231795253116928 |