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...
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Wiley-Blackwell
2002
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Online Access: | http://nora.nerc.ac.uk/id/eprint/13404/ http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2002.tb01066.x/pdf |
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ftnerc:oai:nora.nerc.ac.uk:13404 2023-05-15T13:45:11+02:00 Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags Hooker, Sascha K. Boyd, Ian L. Jessopp, Mark Cox, Oliver Blackwell, John Boveng, Peter L. Bengtson, John L. 2002 http://nora.nerc.ac.uk/id/eprint/13404/ http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2002.tb01066.x/pdf unknown Wiley-Blackwell Hooker, Sascha K.; Boyd, Ian L.; Jessopp, Mark; Cox, Oliver; Blackwell, John; Boveng, Peter L.; Bengtson, John L. 2002 Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. Marine Mammal Science, 18 (3). 680-697. https://doi.org/10.1111/j.1748-7692.2002.tb01066.x <https://doi.org/10.1111/j.1748-7692.2002.tb01066.x> Marine Sciences Zoology Ecology and Environment Publication - Article PeerReviewed 2002 ftnerc https://doi.org/10.1111/j.1748-7692.2002.tb01066.x 2023-02-04T19:28:34Z 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 Seals Arctocephalus gazella Bird Island Euphausia superba Natural Environment Research Council: NERC Open Research Archive Antarctic Austral Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Marine Mammal Science 18 3 680 697 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Zoology Ecology and Environment |
spellingShingle |
Marine Sciences Zoology Ecology and Environment Hooker, Sascha K. Boyd, Ian L. Jessopp, Mark Cox, Oliver Blackwell, John Boveng, Peter L. Bengtson, John L. Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags |
topic_facet |
Marine Sciences Zoology Ecology and Environment |
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 K. Boyd, Ian L. Jessopp, Mark Cox, Oliver Blackwell, John Boveng, Peter L. Bengtson, John L. |
author_facet |
Hooker, Sascha K. Boyd, Ian L. Jessopp, Mark Cox, Oliver Blackwell, John Boveng, Peter L. Bengtson, John L. |
author_sort |
Hooker, Sascha K. |
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 |
publisher |
Wiley-Blackwell |
publishDate |
2002 |
url |
http://nora.nerc.ac.uk/id/eprint/13404/ http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2002.tb01066.x/pdf |
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 Seals Arctocephalus gazella Bird Island Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella Bird Island Euphausia superba |
op_relation |
Hooker, Sascha K.; Boyd, Ian L.; Jessopp, Mark; Cox, Oliver; Blackwell, John; Boveng, Peter L.; Bengtson, John L. 2002 Monitoring the prey-field of marine predators: combining digital imaging with datalogging tags. Marine Mammal Science, 18 (3). 680-697. https://doi.org/10.1111/j.1748-7692.2002.tb01066.x <https://doi.org/10.1111/j.1748-7692.2002.tb01066.x> |
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_ |
1766215485556260864 |