Document Detail

Sonar-induced temporary hearing loss in dolphins.
MedLine Citation:
PMID:  19364712     Owner:  NLM     Status:  MEDLINE    
There is increasing concern that human-produced ocean noise is adversely affecting marine mammals, as several recent cetacean mass strandings may have been caused by animals' interactions with naval 'mid-frequency' sonar. However, it has yet to be empirically demonstrated how sonar could induce these strandings or cause physiological effects. In controlled experimental studies, we show that mid-frequency sonar can induce temporary hearing loss in a bottlenose dolphin (Tursiops truncatus). Mild-behavioural alterations were also associated with the exposures. The auditory effects were induced only by repeated exposures to intense sonar pings with total sound exposure levels of 214 dB re: 1 microPa(2) s. Data support an increasing energy model to predict temporary noise-induced hearing loss and indicate that odontocete noise exposure effects bear trends similar to terrestrial mammals. Thus, sonar can induce physiological and behavioural effects in at least one species of odontocete; however, exposures must be of prolonged, high sound exposures levels to generate these effects.
T Aran Mooney; Paul E Nachtigall; Stephanie Vlachos
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2009-04-08
Journal Detail:
Title:  Biology letters     Volume:  5     ISSN:  1744-957X     ISO Abbreviation:  Biol. Lett.     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2009-07-14     Completed Date:  2009-12-14     Revised Date:  2010-09-27    
Medline Journal Info:
Nlm Unique ID:  101247722     Medline TA:  Biol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  565-7     Citation Subset:  IM    
Department of Zoology, University of Hawaii, Kaneohe, HI 96734, USA.
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MeSH Terms
Acoustic Stimulation
Auditory Threshold / physiology
Bottle-Nosed Dolphin / physiology*
Evoked Potentials, Auditory
Hearing / physiology*
Hearing Loss, Noise-Induced*
Noise / adverse effects*
Oceans and Seas
Time Factors

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