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Comparison of echolocation behaviour between coastal and riverine porpoises
Akamatsu, Tomonari; Teilmann, Jonas; Miller, Lee A.; Tougaard, Jakob; Dietz, Rune; Wang, Ding; Wang, Kexiong; Siebert, Ursula; Naito, Yasuhiko; Akamatsu, T, Natl Res Inst Fisheries Engn, Fisheries Res Agcy, Ibaraki 3140408, Japan
2007
Conference Name2nd International Conference on Bio-logging Science
Source PublicationDEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
Pages290-297
Conference DateJUN 13-16, 2005
Conference PlaceSt Andrews, SCOTLAND
DepartmentNatl Res Inst Fisheries Engn, Fisheries Res Agcy, Ibaraki 3140408, Japan; Natl Environm Res Inst, DK-4000 Roskilde, Denmark; Univ So Denmark, Inst Biol, DK-5230 Odense, Denmark; Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China; Univ Kiel, Forsch & Technol Zentrum Westkuste, D-25671 Hafentorn, Busum, Germany; Natl Inst Polar Res, Tokyo 1738515, Japan
AbstractEcholocation behaviour of a harbor porpoise and six finless porpoises was recorded in open-water systems using acoustic data loggers (A-tag). In total 1359 click trains were recorded during 4.6 h for the harbor porpoise and 46,240 click trains were recorded during 82.3 h for the finless porpoises. The harbor and finless porpoises produced sonar click trains every 12.3 and 6.4 s on average, respectively. During the inter-click-train interval, the porpoises were silent or produced clicks below 148 dB re. 1 mu Pa, the detection threshold of the tag. Ninety percent of the inter-click-train intervals were 20 s or less in both species. This means that porpoises frequently produce intense click trains. Click-train intervals lasting over 50 s constituted 1% of the total intervals in finless porpoises and 4% in the harbor porpoise. Both species swam without intense clicks for less than 10 in in most cases, but occasionally remained silent or used undetected low-intensity clicks for more than 1 min. During these periods, the porpoises would be susceptible to entanglement in fishing nets. (c) 2007 Elsevier Ltd. All rights reserved.
KeywordBioacoustics Echolocation Marine Mammals By Catch Finless Porpoise Harbor Porpoise
Funding OrganizationSea Mammal Res Unit, SMRU, EU Network Excellence Marine Biodivers & Ecosyst Functioning
Indexed BySCI
Language英语
WOS IDWOS:000245820500009
Citation statistics
Document Type会议论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/11771
Collection会议论文
Corresponding AuthorAkamatsu, T, Natl Res Inst Fisheries Engn, Fisheries Res Agcy, Ibaraki 3140408, Japan
Recommended Citation
GB/T 7714
Akamatsu, Tomonari,Teilmann, Jonas,Miller, Lee A.,et al. Comparison of echolocation behaviour between coastal and riverine porpoises[C],2007:290-297.
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