Comparison of echolocation behaviour between coastal oceanic and riverine porpoises

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.

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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
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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