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Categorizing click trains to increase taxonomic precision in echolocation click loggers

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Palmer_2017_Categorizing_click_trains_JASA_AAM.pdf (1.490Mb)
Date
08/2017
Author
Palmer, K. J.
Brookes, Kate
Rendell, Luke
Keywords
Passive acoustic monitoring
Odontocete
Echolocation click logger
GC Oceanography
QH301 Biology
Acoustics and Ultrasonics
NDAS
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Abstract
Passive acoustic monitoring is an efficient way to study acoustically active animals but species identification remains a major challenge. C-PODs are popular logging devices that automatically detect odontocete echolocation clicks. However, the accompanying analysis software does not distinguish between delphinid species. Click train features logged by C-PODs were compared to frequency spectra from adjacently deployed continuous recorders. A generalized additive model was then used to categorize C-POD click trains into three groups: broadband click trains, produced by bottlenose dolphin (Tursiops truncatus) or common dolphin (Delphinus delphis), frequency-banded click trains, produced by Risso's (Grampus griseus) or white beaked dolphins (Lagenorhynchus albirostris), and unknown click trains. Incorrect categorization rates for broadband and frequency banded clicks were 0.02 (SD 0.01), but only 30% of the click trains met the categorization threshold. To increase the proportion of categorized click trains, model predictions were pooled within acoustic encounters and a likelihood ratio threshold was used to categorize encounters. This increased the proportion of the click trains meeting either the broadband or frequency banded categorization threshold to 98%. Predicted species distribution at the 30 study sites matched well to visual sighting records from the region.
Citation
Palmer , K J , Brookes , K & Rendell , L 2017 , ' Categorizing click trains to increase taxonomic precision in echolocation click loggers ' , Journal of the Acoustical Society of America , vol. 142 , no. 2 , pp. 863-877 . https://doi.org/10.1121/1.4996000
Publication
Journal of the Acoustical Society of America
Status
Peer reviewed
DOI
https://doi.org/10.1121/1.4996000
ISSN
0001-4966
Type
Journal article
Rights
© 2017, Acoustical Society of American. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1121/1.4996000
Description
L.R. and K.J.P. were supported by Marine Scotland Science and the Marine Alliance for Science and Technology for Scotland (MASTS) pooling initiative and their support is gratefully acknowledged. MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12721

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