NDLI: Comparison of echolocation behaviour between coastal and riverine porpoises

Content Provider	IEEE Xplore Digital Library
Author	Akamatsu, T. Teilmann, J. Miller, L.A. Tougaard, J. Dietz, R. Ding Wang Kexiong Wang Siebert, U. Naito, Y.
Copyright Year	2007
Description	Author affiliation: Nat. Res. Inst. of Fisheries Eng., Ibaraki (Akamatsu, T.)
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. 1 mPa, 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.
Starting Page	520
Ending Page	526
File Size	7685077
Page Count	7
File Format	PDF
ISBN	1424412072
DOI	10.1109/UT.2007.370755
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-04-17
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sea measurements Acoustic signal detection Animals Monitoring Acoustic devices Whales Aquaculture Gold Sonar navigation Tagging
Content Type	Text
Resource Type	Article

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