Document Detail


Detection of beaked whales using near surface towed hydrophones: prospects for survey and mitigation.
MedLine Citation:
PMID:  18532109     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Beaked whales are extremely difficult to sight at sea and this hampers attempts to study them, and makes real time mitigation difficult. Passive acoustic monitoring could improve detection efficiency. Blainville's beaked whales, (Mesoplodon densirostris) are known to produce most of their vocalizations at depth. They are routinely detected on bottom mounted hydrophones arrays but the extent to which they can be detected using near-surface hydrophones is not known. Continuous recordings were made at a sampling rate of 192 kHz from towed hydrophone arrays during line transect surveys in the Bahamas in conjunction with teams monitoring bottom-mounted hydrophones at the AUTEC Tongue of the Ocean navy range. A beaked whale click detector and classifier was developed within Rainbow Click and PAMGUARD and this was both run in real time and used to analyze recordings to pick out beaked whale click trains. Detected click trains correlated well with detection of beaked whales on bottom-mounted hydrophones. Three species of beaked whale were encountered visually and detected acoustically: Mesoplodon densirostris, Ziphius cavirostris and Mesoplodon europaeus. Target motion analysis of bearings to sequences of clicks suggests a maximum detection range of approximately three kilometers and preliminary results indicate that clicks can be identified to species.
Authors:
Douglas Gillespie; Jonathan Gordon; Marjolaine Caillat; Diane Claridge; David Moretti; Ian Boyd
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  123     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-06-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3774     Citation Subset:  IM    
Affiliation:
Sea Mammal Research Unit, Gatty Marine Laboratory, University of St. Andrews, KY16 8LB St. Andrews, UK, dg50@st-andrews.ac.uk.
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