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Echolocation in sympatric Peale's dolphins (Lagenorhynchus australis) and Commerson's dolphins (Cephalorhynchus commersonii) producing narrow-band high-frequency clicks.
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Echolocation in sympatric Peale's dolphins (Lagenorhynchus australis) and Commerson's dolphins (Cephalorhynchus commersonii) producing narrow-band high-frequency clicks.

Author: LA Kyhn Affiliation: National Environmental Research Institute, Department of Arctic Environment, Aarhus University, Frederiksborgvej 399, DK-4000, Roskilde, Denmark. lky@dmu.dkFH JensenK BeedholmJ TougaardM HansenAll authors
Edition/Format: Article Article : English
Publication:The Journal of experimental biology, 2010 Jun 1; 213(11): 1940-9
Database:From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
Other Databases: ArticleFirstElsevierBritish Library Serials
Summary:
An increasing number of smaller odontocetes have recently been shown to produce stereotyped narrow-band high-frequency (NBHF) echolocation clicks. Click source parameters of NBHF clicks are very similar, and it is unclear whether the sonars of individual NBHF species are adapted to specific habitats or the presence of other NBHF species. Here, we test whether sympatric NBHF species sharing the same habitat show  Read more...
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Document Type: Article
All Authors / Contributors: LA Kyhn Affiliation: National Environmental Research Institute, Department of Arctic Environment, Aarhus University, Frederiksborgvej 399, DK-4000, Roskilde, Denmark. lky@dmu.dk; FH Jensen; K Beedholm; J Tougaard; M Hansen; PT Madsen
ISSN:0022-0949
Language Note: English
Unique Identifier: 618825118
Awards:

Abstract:

An increasing number of smaller odontocetes have recently been shown to produce stereotyped narrow-band high-frequency (NBHF) echolocation clicks. Click source parameters of NBHF clicks are very similar, and it is unclear whether the sonars of individual NBHF species are adapted to specific habitats or the presence of other NBHF species. Here, we test whether sympatric NBHF species sharing the same habitat show similar adaptations in their echolocation clicks and whether their clicks display signs of character displacement. Wide-band sound recordings were obtained with a six-element hydrophone array from wild Peale's (Lagenorhynchus australis) and Commerson's (Cephalorhynchus commersonii) dolphins off the Falkland Islands. The centroid frequency was different between Commerson's (133+/-2 kHz) and Peale's (129+/-3 kHz) dolphins. The r.m.s. bandwidth was 12+/-3 kHz for both species. The source level was higher for Peale's dolphin (185+/-6 dB re 1 muPa p.-p.) than for Commerson's (177+/-5 dB re 1 muPa p.-p.). The mean directivity indexes were 25 dB for both species. The relatively low source levels in combination with the high directivity index may be an adaptation to reduce clutter when foraging in a coastal environment. We conclude that the small species-specific shifts in distribution of centroid frequencies around 130 kHz may reflect character displacement in otherwise-stereotyped NBHF clicks.

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