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学科主题: Biology
题名: Scanning sonar of rolling porpoises during prey capture dives
作者: Akamatsu, T.1; Wang, D.2; Wang, K.2; Li, S.2; Dong, S.2
通讯作者: Akamatsu, T, Fisheries Res Agcy, Natl Res Inst Fisheries Engn, Ibaraki 3140408, Japan
关键词: biologging ; echolocation ; cetacean ; dolphin ; finless porpoise ; sonar
刊名: JOURNAL OF EXPERIMENTAL BIOLOGY
发表日期: 2010
DOI: 10.1242/jeb.037655
卷: 213, 期:1, 页:146-152
收录类别: SCI
文章类型: Article
部门归属: [Akamatsu, T.] Fisheries Res Agcy, Natl Res Inst Fisheries Engn, Ibaraki 3140408, Japan; [Wang, D.; Wang, K.; Li, S.; Dong, S.] Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
资助者: National Basic Research Program of China [2007CB411600]; National Natural Science Foundation of China [30730018, 30170142]; President Fund of the Chinese Academy of Sciences [19405005]
类目[WOS]: Biology
研究领域[WOS]: Life Sciences & Biomedicine - Other Topics
摘要: Dolphins and porpoises have excellent biosonar ability, which they use for navigation, ranging and foraging. However, the role of biosonar in free-ranging small cetaceans has not been fully investigated. The biosonar behaviour and body movements of 15 free-ranging finless porpoises (Neophocaena phocaenoides) were observed using electronic tags attached to the animals. The porpoises often rotated their bodies more than 60 deg., on average, around the body axis in a dive bout. This behaviour occupied 31% of the dive duration during 186. h of effective observation time. Rolling dives were associated with extensive searching effort, and 23% of the rolling dive time was phonated, almost twice the phonation ratio of upright dives. Porpoises used short inter-click interval sonar 4.3 times more frequently during rolling dives than during upright dives. Sudden speed drops, which indicated that an individual turned around, occurred 4.5 times more frequently during rolling dives than during upright dives. Together, these data suggest that the porpoises searched extensively for targets and rolled their bodies to enlarge the search area by changing the narrow beam axis of the biosonar. Once a possible target was detected, porpoises frequently produced short-range sonar sounds. Continuous searching for prey and frequent capture trials appeared to occur during rolling dives of finless porpoises. In contrast, head movements ranging +/- 2 cm, which can also change the beam axis, were regularly observed during both dives. Head movements might assist in instant assessment of the arbitrary direction by changing the beam axis rather than prey searching and pursuit.
英文摘要: Dolphins and porpoises have excellent biosonar ability, which they use for navigation, ranging and foraging. However, the role of biosonar in free-ranging small cetaceans has not been fully investigated. The biosonar behaviour and body movements of 15 free-ranging finless porpoises (Neophocaena phocaenoides) were observed using electronic tags attached to the animals. The porpoises often rotated their bodies more than 60 deg., on average, around the body axis in a dive bout. This behaviour occupied 31% of the dive duration during 186. h of effective observation time. Rolling dives were associated with extensive searching effort, and 23% of the rolling dive time was phonated, almost twice the phonation ratio of upright dives. Porpoises used short inter-click interval sonar 4.3 times more frequently during rolling dives than during upright dives. Sudden speed drops, which indicated that an individual turned around, occurred 4.5 times more frequently during rolling dives than during upright dives. Together, these data suggest that the porpoises searched extensively for targets and rolled their bodies to enlarge the search area by changing the narrow beam axis of the biosonar. Once a possible target was detected, porpoises frequently produced short-range sonar sounds. Continuous searching for prey and frequent capture trials appeared to occur during rolling dives of finless porpoises. In contrast, head movements ranging +/- 2 cm, which can also change the beam axis, were regularly observed during both dives. Head movements might assist in instant assessment of the arbitrary direction by changing the beam axis rather than prey searching and pursuit.
关键词[WOS]: WHALES MESOPLODON-DENSIROSTRIS ; PHOCOENA-PHOCOENA ; BEAKED-WHALES ; NEOPHOCAENA-PHOCAENOIDES ; FINLESS PORPOISES ; BEAM PATTERN ; ECHOLOCATION ; BEHAVIOR ; DOLPHIN ; RANGE
语种: 英语
WOS记录号: WOS:000272645800026
ISSN号: 0022-0949
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/14418
Appears in Collections:水生生物多样性与资源保护研究中心_期刊论文

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作者单位: 1.Fisheries Res Agcy, Natl Res Inst Fisheries Engn, Ibaraki 3140408, Japan
2.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China

Recommended Citation:
Akamatsu, T.; Wang, D.; Wang, K.; Li, S.; Dong, S..Scanning sonar of rolling porpoises during prey capture dives,JOURNAL OF EXPERIMENTAL BIOLOGY,2010,213(1):146-152
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