Discriminating between the vocalizations of Indo-Pacific humpback and Australian snubfin dolphins in Queensland, Australia

A. Berg Soto; H. Marsh; Y. Everingham; J.N. Smith; G.J. Parra; M. Noad

doi:10.1121/1.4884772

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Discriminating between the vocalizations of Indo-Pacific humpback and Australian snubfin dolphins in Queensland, Australia

A. Berg Soto, H. Marsh, Y. Everingham, J.N. Smith, G.J. Parra and M. Noad

The Journal of the Acoustical Society of America, Vol.136(2), pp.930-938

2014

DOI: https://doi.org/10.1121/1.4884772

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Abstract

Australian snubfin and Indo-Pacific humpback dolphins co-occur throughout most of their range in coastal waters of tropical Australia. Little is known of their ecology or acoustic repertoires. Vocalizations from humpback and snubfin dolphins were recorded in two locations along the Queensland coast during 2008 and 2010 to describe their vocalizations and evaluate the acoustic differences between these two species. Broad vocalization types were categorized qualitatively. Both species produced click trains burst pulses and whistles. Principal component analysis of the nine acoustic variables extracted from the whistles produced nine principal components that were input into discriminant function analyses to classify 96% of humpback dolphin whistles and about 78% of snubfin dolphin calls correctly. Results indicate clear acoustic differences between the vocal whistle repertoires of these two species. A stepwise routine identified two principal components as significantly distinguishable between whistles of each species: frequency parameters and frequency trend ratio. The capacity to identify these species using acoustic monitoring techniques has the potential to provide information on presence/absence, habitat use and relative abundance for each species.

Details

Title: Discriminating between the vocalizations of Indo-Pacific humpback and Australian snubfin dolphins in Queensland, Australia
Authors/Creators: A. Berg Soto (Author/Creator)
H. Marsh (Author/Creator) - James Cook University
Y. Everingham (Author/Creator) - James Cook University
J.N. Smith (Author/Creator) - Murdoch University
G.J. Parra (Author/Creator) - Flinders University
M. Noad (Author/Creator) - The University of Queensland
Publication Details: The Journal of the Acoustical Society of America, Vol.136(2), pp.930-938
Publisher: Acoustical Society of America
Identifiers: 991005540555107891
Copyright: © 2014 Acoustical Society of America.
Murdoch Affiliation: School of Veterinary and Life Sciences
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.35 Zoology & Animal Ecology; 3.35.796 Marine Mammal Ecology
Web Of Science research areas: Acoustics; Audiology & Speech-language Pathology
ESI research areas: Physics