Testing predictions of optimal diving theory using animal-borne video from harbour seals ( Phoca vitulina concolor)
Optimal diving theory predicts that animals make decisions that maximize their foraging profitability subject to the constraint of oxygen stores. We examined the temporal pattern of prey encounters within a dive from concurrently collected dive data and animal-borne video from a free-ranging pinnipe...
Published in: | Canadian Journal of Zoology |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2014
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/cjz-2013-0137 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjz-2013-0137 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2013-0137 |
id |
crcansciencepubl:10.1139/cjz-2013-0137 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/cjz-2013-0137 2024-09-30T14:41:21+00:00 Testing predictions of optimal diving theory using animal-borne video from harbour seals ( Phoca vitulina concolor) Heaslip, Susan G. Bowen, W. Don Iverson, Sara J. 2014 http://dx.doi.org/10.1139/cjz-2013-0137 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjz-2013-0137 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2013-0137 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 92, issue 4, page 309-318 ISSN 0008-4301 1480-3283 journal-article 2014 crcansciencepubl https://doi.org/10.1139/cjz-2013-0137 2024-09-12T04:13:25Z Optimal diving theory predicts that animals make decisions that maximize their foraging profitability subject to the constraint of oxygen stores. We examined the temporal pattern of prey encounters within a dive from concurrently collected dive data and animal-borne video from a free-ranging pinniped to test predictions of optimal diving theory. Crittercams were deployed on 32 adult male harbour seals (Phoca vitulina concolor De Kay, 1842) at Sable Island, Nova Scotia, Canada, for 3 days each. Deployments resulted in approximately 3 h of video per seal and a total of 2275 capture attempts for 1474 prey encounter events recorded. We found support for seven of the nine selected predictions of optimal diving theory. As predicted, prey encounters increased with bottom duration; dive duration increased with dive depth; and travel duration, bottom duration, and percent bottom duration decreased over a wide range of travel durations. Descent duration did increase with dive depth, and seals terminated dives earlier when no prey were encountered and when prey were encountered later in a dive. Contrary to prediction, bottom duration did not increase and then decrease for short travel durations and dives were not terminated earlier when travel durations were short and prey encounter rate was low. Article in Journal/Newspaper Phoca vitulina Canadian Science Publishing Canada Kay ENVELOPE(-60.917,-60.917,-64.117,-64.117) Canadian Journal of Zoology 92 4 309 318 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Optimal diving theory predicts that animals make decisions that maximize their foraging profitability subject to the constraint of oxygen stores. We examined the temporal pattern of prey encounters within a dive from concurrently collected dive data and animal-borne video from a free-ranging pinniped to test predictions of optimal diving theory. Crittercams were deployed on 32 adult male harbour seals (Phoca vitulina concolor De Kay, 1842) at Sable Island, Nova Scotia, Canada, for 3 days each. Deployments resulted in approximately 3 h of video per seal and a total of 2275 capture attempts for 1474 prey encounter events recorded. We found support for seven of the nine selected predictions of optimal diving theory. As predicted, prey encounters increased with bottom duration; dive duration increased with dive depth; and travel duration, bottom duration, and percent bottom duration decreased over a wide range of travel durations. Descent duration did increase with dive depth, and seals terminated dives earlier when no prey were encountered and when prey were encountered later in a dive. Contrary to prediction, bottom duration did not increase and then decrease for short travel durations and dives were not terminated earlier when travel durations were short and prey encounter rate was low. |
format |
Article in Journal/Newspaper |
author |
Heaslip, Susan G. Bowen, W. Don Iverson, Sara J. |
spellingShingle |
Heaslip, Susan G. Bowen, W. Don Iverson, Sara J. Testing predictions of optimal diving theory using animal-borne video from harbour seals ( Phoca vitulina concolor) |
author_facet |
Heaslip, Susan G. Bowen, W. Don Iverson, Sara J. |
author_sort |
Heaslip, Susan G. |
title |
Testing predictions of optimal diving theory using animal-borne video from harbour seals ( Phoca vitulina concolor) |
title_short |
Testing predictions of optimal diving theory using animal-borne video from harbour seals ( Phoca vitulina concolor) |
title_full |
Testing predictions of optimal diving theory using animal-borne video from harbour seals ( Phoca vitulina concolor) |
title_fullStr |
Testing predictions of optimal diving theory using animal-borne video from harbour seals ( Phoca vitulina concolor) |
title_full_unstemmed |
Testing predictions of optimal diving theory using animal-borne video from harbour seals ( Phoca vitulina concolor) |
title_sort |
testing predictions of optimal diving theory using animal-borne video from harbour seals ( phoca vitulina concolor) |
publisher |
Canadian Science Publishing |
publishDate |
2014 |
url |
http://dx.doi.org/10.1139/cjz-2013-0137 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjz-2013-0137 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2013-0137 |
long_lat |
ENVELOPE(-60.917,-60.917,-64.117,-64.117) |
geographic |
Canada Kay |
geographic_facet |
Canada Kay |
genre |
Phoca vitulina |
genre_facet |
Phoca vitulina |
op_source |
Canadian Journal of Zoology volume 92, issue 4, page 309-318 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjz-2013-0137 |
container_title |
Canadian Journal of Zoology |
container_volume |
92 |
container_issue |
4 |
container_start_page |
309 |
op_container_end_page |
318 |
_version_ |
1811643747799138304 |