Akamatsu, T., Rune , D., Wang, K., Naito , Y., Siebert, Ursula and Teilmann , J. (2007) Comparison of echolocation behaviour between coastal oceanic and riverine porpoises Deep-Sea Research Part II-Topical Studies in Oceanography, 54 . pp. 290-297. DOI 10.1016/j.dsr2.2006.11.006.
Full text not available from this repository.Abstract
Echolocation 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. View the MathML source, 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 m 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.
Document Type: | Article |
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Keywords: | Bioacoustics; Echolocation; Marine mammals; By catch, Finless porpoise; Harbor porpoise |
Research affiliation: | OceanRep > The Future Ocean - Cluster of Excellence Kiel University |
Refereed: | Yes |
DOI etc.: | 10.1016/j.dsr2.2006.11.006 |
ISSN: | 0967-0645 |
Projects: | Future Ocean |
Date Deposited: | 19 Apr 2011 06:53 |
Last Modified: | 27 Jan 2012 05:11 |
URI: | http://eprints.uni-kiel.de/id/eprint/11026 |
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