arnould-behaviouralresponse-2012.pdf (623.19 kB)
The behavioural response of Australian fur seals to motor boat noise
journal contribution
posted on 2012-05-18, 00:00 authored by J Tripovich, S Hall-Aspland, I Charrier, John ArnouldJohn ArnouldAustralian fur seals breed on thirteen islands located in the Bass Strait, Australia. Land access to these islands is restricted, minimising human presence but boat access is still permissible with limitations on approach distances. Thirty-two controlled noise exposure experiments were conducted on breeding Australian fur seals to determine their behavioural response to controlled in-air motor boat noise on Kanowna Island (39°10′S, 146°18′E). Our results show there were significant differences in the seals' behaviour at low (64–70 dB) versus high (75–85 dB) sound levels, with seals orientating themselves towards or physically moving away from the louder boat noise at three different sound levels. Furthermore, seals responded more aggressively with one another and were more alert when they heard louder boat noise. Australian fur seals demonstrated plasticity in their vocal responses to boat noise with calls being significantly different between the various sound intensities and barks tending to get faster as the boat noise got louder. These results suggest that Australian fur seals on Kanowna Island show behavioural disturbance to high level boat noise. Consequently, it is recommended that an appropriate level of received boat sound emissions at breeding fur seal colonies be below 74 dB and that these findings be taken into account when evaluating appropriate approach distances and speed limits for boats.
History
Journal
PLoS OneVolume
7Issue
5Pagination
1 - 7Publisher
Public Library of ScienceLocation
San Francisco, Calif.Publisher DOI
ISSN
1932-6203Language
engNotes
This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.Publication classification
C1 Refereed article in a scholarly journalCopyright notice
2012, Tripovich et al.Usage metrics
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