the behavioural response of australian fur seals to motor boat noise澳大利亚毛皮海豹的行为反应摩托艇噪音.pdf

The Behavioural Response of Australian Fur Seals to Motor Boat Noise 1 ¤ 2 3 4 Joy S. Tripovich * , Sophie Hall-Aspland , Isabelle Charrier , John P. Y. Arnould 1 Faculty of Veterinary Science, University of Sydney, Sydney, New South Wales, Australia, 2 Institute of Marine and Antarctic Studies, University of Tasmania, Hobart, ´ Tasmania, Australia, 3 Centre de Neurosciences, Universite Paris Sud, Paris-Sud, Orsay, France, 4 School of Life and Environmental Sciences, Deakin University, Burwood, Victoria, Australia Abstract Australian 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 (39u109S, 146u189E). 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 behav