Diving behaviour of freshwater finless porpoises (Neophocaena phocaenoides) in an oxbow of the Yangtze River, China
Dive-depth and swim-speed of a juvenile and an adult free-ranging, Yangtze finless porpoises ( Neophocaena phocaenoides ) were observed using velocity-time-depth recorders in an oxbow of the Yangtze River. In total, 8222 individual dives were recorded over 59 hours. Two dive types, deep-dive (≥2.7 m...
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2002
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fthighwire:oai:open-archive.highwire.org:icesjms:59/2/438 2023-05-15T17:59:10+02:00 Diving behaviour of freshwater finless porpoises (Neophocaena phocaenoides) in an oxbow of the Yangtze River, China Akamatsu, Tomonari Wang, Ding Wang, Kexiong Wei, Zhuo Zhao, Qingzhong Naito, Yasuhiko 2002-01-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/59/2/438 https://doi.org/10.1006/jmsc.2001.1159 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/59/2/438 http://dx.doi.org/10.1006/jmsc.2001.1159 Copyright (C) 2002, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Short communication TEXT 2002 fthighwire https://doi.org/10.1006/jmsc.2001.1159 2013-05-27T03:29:33Z Dive-depth and swim-speed of a juvenile and an adult free-ranging, Yangtze finless porpoises ( Neophocaena phocaenoides ) were observed using velocity-time-depth recorders in an oxbow of the Yangtze River. In total, 8222 individual dives were recorded over 59 hours. Two dive types, deep-dive (≥2.7 m) and shallow-dive, were recognized. Horizontal travel distances of two finless porpoises in a day were 94.4 km and 90.3 km, which were longer than those of oceanic relative species (harbor porpoises, Phocoena phocoena ). Although the shallow water limited the maximum dive-depth, dive-duration, and bottom-time of finless porpoises were similar to the harbor porpoises. A sudden drop of swim-speed below 0.25 m s−1 was frequently observed nearby the maximum dive-depth. This seemed to indicate “turning around” behaviour, possibly during prey pursuit. Text Phocoena phocoena HighWire Press (Stanford University) ICES Journal of Marine Science 59 2 438 443 |
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HighWire Press (Stanford University) |
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language |
English |
topic |
Short communication |
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Short communication Akamatsu, Tomonari Wang, Ding Wang, Kexiong Wei, Zhuo Zhao, Qingzhong Naito, Yasuhiko Diving behaviour of freshwater finless porpoises (Neophocaena phocaenoides) in an oxbow of the Yangtze River, China |
topic_facet |
Short communication |
description |
Dive-depth and swim-speed of a juvenile and an adult free-ranging, Yangtze finless porpoises ( Neophocaena phocaenoides ) were observed using velocity-time-depth recorders in an oxbow of the Yangtze River. In total, 8222 individual dives were recorded over 59 hours. Two dive types, deep-dive (≥2.7 m) and shallow-dive, were recognized. Horizontal travel distances of two finless porpoises in a day were 94.4 km and 90.3 km, which were longer than those of oceanic relative species (harbor porpoises, Phocoena phocoena ). Although the shallow water limited the maximum dive-depth, dive-duration, and bottom-time of finless porpoises were similar to the harbor porpoises. A sudden drop of swim-speed below 0.25 m s−1 was frequently observed nearby the maximum dive-depth. This seemed to indicate “turning around” behaviour, possibly during prey pursuit. |
format |
Text |
author |
Akamatsu, Tomonari Wang, Ding Wang, Kexiong Wei, Zhuo Zhao, Qingzhong Naito, Yasuhiko |
author_facet |
Akamatsu, Tomonari Wang, Ding Wang, Kexiong Wei, Zhuo Zhao, Qingzhong Naito, Yasuhiko |
author_sort |
Akamatsu, Tomonari |
title |
Diving behaviour of freshwater finless porpoises (Neophocaena phocaenoides) in an oxbow of the Yangtze River, China |
title_short |
Diving behaviour of freshwater finless porpoises (Neophocaena phocaenoides) in an oxbow of the Yangtze River, China |
title_full |
Diving behaviour of freshwater finless porpoises (Neophocaena phocaenoides) in an oxbow of the Yangtze River, China |
title_fullStr |
Diving behaviour of freshwater finless porpoises (Neophocaena phocaenoides) in an oxbow of the Yangtze River, China |
title_full_unstemmed |
Diving behaviour of freshwater finless porpoises (Neophocaena phocaenoides) in an oxbow of the Yangtze River, China |
title_sort |
diving behaviour of freshwater finless porpoises (neophocaena phocaenoides) in an oxbow of the yangtze river, china |
publisher |
Oxford University Press |
publishDate |
2002 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/59/2/438 https://doi.org/10.1006/jmsc.2001.1159 |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/59/2/438 http://dx.doi.org/10.1006/jmsc.2001.1159 |
op_rights |
Copyright (C) 2002, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1006/jmsc.2001.1159 |
container_title |
ICES Journal of Marine Science |
container_volume |
59 |
container_issue |
2 |
container_start_page |
438 |
op_container_end_page |
443 |
_version_ |
1766167935913558016 |