Using static acoustic monitoring to describe echolocation behaviour of heaviside’s dolphins (Cephalorhynchus heavisidii) in Namibia

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dc.contributor.author Leeney, Ruth H.
dc.contributor.author Carslake, David
dc.contributor.author Elwen, Simon Harvey
dc.date.accessioned 2011-08-12T10:40:10Z
dc.date.available 2011-08-12T10:40:10Z
dc.date.issued 2011
dc.description.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. en
dc.description.sponsorship The Namibian Dolphin Project is funded by the British Ecological Society, the Mohammed bin Zayed Species Conservation Fund, NACOMA, the Nedbank Namibia Go Green Fund, and the Rufford Small Grants Foundation, in collaboration with the Namibian Nature Foundation and the Namibian Ministry for Fisheries and Marine Resources. en
dc.description.uri http://www.aquaticmammalsjournal.org/ en
dc.identifier.citation Leeney, RH, Carslake, D & Elwen, SH 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. en
dc.identifier.issn 0167-5427
dc.identifier.other 10.1578/AM.37.2.2011.151
dc.identifier.uri http://hdl.handle.net/2263/17051
dc.language.iso en en
dc.publisher European Association for Aquatic Mammals en
dc.rights European Association for Aquatic Mammals en
dc.subject Habitat use en
dc.subject Echolocation behaviour en
dc.subject T-POD en
dc.subject Inter-click interval en
dc.subject Heaviside’s dolphin en
dc.subject Cephalorhynchus heavisidii en
dc.subject Click train en
dc.subject.lcsh Cephalorhynchus en
dc.subject.lcsh Animal behavior en
dc.title Using static acoustic monitoring to describe echolocation behaviour of heaviside’s dolphins (Cephalorhynchus heavisidii) in Namibia en
dc.type Article en


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