[MARMAM] new paper on acoustic monitoring of Heaviside's dolphins

ruth leeney ruleeney at yahoo.co.uk
Thu May 5 23:43:41 PDT 2011

Dear MARMAM community,

The following paper has recently been published in Aquatic Mammals.

Using Static Acoustic Monitoring to Describe Echolocation Behaviour of Heaviside’s Dolphins (Cephalorhynchus heavisidii) in Namibia.

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.

To request a pdf of this paper, please contact me at ruleeney at yahoo.co.uk .

Best wishes,


Also recently published by the Namibian Dolphin Project:

Elwen & Leeney (2010) Injury and Subsequent Healing of a Propeller Strike Injury to a Heaviside’s Dolphin (Cephalorhynchus heavisidii). Aquatic Mammals 36: 382-387. 

Ruth H. Leeney


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