Leeney, R. H., Carslake, David and Elwen, Simon H.. (2011) Using static acoustic monitoring to describe echolocation behaviour of Heaviside’s dolphins (Cephalorhynchus heavisidii) in Namibia. Aquatic Mammals, Vol.37 (No.2). pp. 151-160. ISSN 01675427

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Abstract

Static acoustic monitoring is a cost-effective, low-effort means of gathering large datasets on echolocation click characteristics and habitat use by odontocetes. Heaviside's dolphins (Cephalorhynchus heavisidii) were monitored using an acoustic monitoring unit, the T-POD, in July 2008 at a site of known high abundance for this species in Walvis Bay, Namibia. The T-POD successfully detected clicks from Heaviside's dolphins, and these clicks were detected in the 120 to 140 kHz frequency range. A distinct diel pattern to the hourly mean inter-click interval was observed, with higher values during daylight hours than at night, suggesting that click trains are produced at faster rates at night time. There was no apparent diel pattern in the proportion of buzz trains produced, however. A diel pattern in click activity was observed, with many more detection-positive minutes per hour recorded between dusk and dawn, and vocalization activity dropping to low levels in the middle of the day. This corresponded with visual observations made on abundance of dolphins in the study area. These results suggest that Heaviside's dolphins use this site primarily during the night. Static acoustic monitoring proved to be an effective technique for monitoring patterns of habitat use by Heaviside's dolphins.

Item Type:	Journal Article
Subjects:	Q Science > QL Zoology
Divisions:	Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010)
Library of Congress Subject Headings (LCSH):	Dolphins -- Monitoring -- Namibia, Echolocation (Physiology)
Journal or Publication Title:	Aquatic Mammals
Publisher:	Western Illinois University Regional Center
ISSN:	01675427
Official Date:	2011
Volume:	Vol.37
Number:	No.2
Page Range:	pp. 151-160
Identification Number:	10.1578/AM.37.2.2011.151
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	British Ecological Society (BES), Mohamed bin Zayed Species Conservation Fund, Namibian Coast Conservation and Management Project (NACOMA), Nedbank (Swaziland) Limited, Rufford Small Grants Foundation, Namibian Nature Foundation (NNF), Namibia. Ministry of Fisheries and Marine Resources (MFMR)
URI:	http://wrap.warwick.ac.uk/id/eprint/39084

Data sourced from Thomson Reuters' Web of Knowledge

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