Diving behaviour of harbour porpoises, Phocoena phocoena
The diving behaviour of seven free-ranging harbour porpoises (Phocoena phocoena) was examined using time–depth recorders. In total, 8167 individual dives were recorded over 254 h. The longest period of data collection from an individual was 106.1 h. Mean dive depths and durations ranged from 14 ± 16...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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1995
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crcansciencepubl:10.1139/f95-104 2024-04-07T07:55:27+00:00 Diving behaviour of harbour porpoises, Phocoena phocoena Westgate, Andrew J. Head, Andrew J. Berggren, Per Koopman, Heather N. Gaskin, David E. 1995 http://dx.doi.org/10.1139/f95-104 http://www.nrcresearchpress.com/doi/pdf/10.1139/f95-104 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 52, issue 5, page 1064-1073 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1995 crcansciencepubl https://doi.org/10.1139/f95-104 2024-03-08T00:37:30Z The diving behaviour of seven free-ranging harbour porpoises (Phocoena phocoena) was examined using time–depth recorders. In total, 8167 individual dives were recorded over 254 h. The longest period of data collection from an individual was 106.1 h. Mean dive depths and durations ranged from 14 ± 16 to 41 ± 32 m, and from 44 ± 37 to 103 ± 67 s, respectively. The maximum recorded dive depth and duration was 226 m and 321 s. This performance may not represent the maximum capacity of harbour porpoises but rather the maximum depth of the study area. Individual dives had similar rates of descent and ascent, which ranged from 1.1 ± 0.6 to 2.3 ± 1.4 m/s, and from 0.9 ± 0.6 to 2.1 ± 1.4 m/s, respectively. Two porpoises with monitoring periods >2 days demonstrated a diel pattern in their diving, making fewer, but deeper dives at night. Comparison of the diving behaviour of harbour porpoises with data on the depth of 140 porpoises entanglements in groundfish gill nets in the Bay of Fundy showed these seven porpoises made between 22 and 70% of dives to depths (range 20–130 m) where the majority of entanglements were reported. Article in Journal/Newspaper Phocoena phocoena Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 52 5 1064 1073 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Westgate, Andrew J. Head, Andrew J. Berggren, Per Koopman, Heather N. Gaskin, David E. Diving behaviour of harbour porpoises, Phocoena phocoena |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
The diving behaviour of seven free-ranging harbour porpoises (Phocoena phocoena) was examined using time–depth recorders. In total, 8167 individual dives were recorded over 254 h. The longest period of data collection from an individual was 106.1 h. Mean dive depths and durations ranged from 14 ± 16 to 41 ± 32 m, and from 44 ± 37 to 103 ± 67 s, respectively. The maximum recorded dive depth and duration was 226 m and 321 s. This performance may not represent the maximum capacity of harbour porpoises but rather the maximum depth of the study area. Individual dives had similar rates of descent and ascent, which ranged from 1.1 ± 0.6 to 2.3 ± 1.4 m/s, and from 0.9 ± 0.6 to 2.1 ± 1.4 m/s, respectively. Two porpoises with monitoring periods >2 days demonstrated a diel pattern in their diving, making fewer, but deeper dives at night. Comparison of the diving behaviour of harbour porpoises with data on the depth of 140 porpoises entanglements in groundfish gill nets in the Bay of Fundy showed these seven porpoises made between 22 and 70% of dives to depths (range 20–130 m) where the majority of entanglements were reported. |
format |
Article in Journal/Newspaper |
author |
Westgate, Andrew J. Head, Andrew J. Berggren, Per Koopman, Heather N. Gaskin, David E. |
author_facet |
Westgate, Andrew J. Head, Andrew J. Berggren, Per Koopman, Heather N. Gaskin, David E. |
author_sort |
Westgate, Andrew J. |
title |
Diving behaviour of harbour porpoises, Phocoena phocoena |
title_short |
Diving behaviour of harbour porpoises, Phocoena phocoena |
title_full |
Diving behaviour of harbour porpoises, Phocoena phocoena |
title_fullStr |
Diving behaviour of harbour porpoises, Phocoena phocoena |
title_full_unstemmed |
Diving behaviour of harbour porpoises, Phocoena phocoena |
title_sort |
diving behaviour of harbour porpoises, phocoena phocoena |
publisher |
Canadian Science Publishing |
publishDate |
1995 |
url |
http://dx.doi.org/10.1139/f95-104 http://www.nrcresearchpress.com/doi/pdf/10.1139/f95-104 |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 52, issue 5, page 1064-1073 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f95-104 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
52 |
container_issue |
5 |
container_start_page |
1064 |
op_container_end_page |
1073 |
_version_ |
1795672628307951616 |