Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Interpreting short-term behavioural responses to disturbance within a longitudinal perspective

Bejder, L., Samuels, A., Whitehead, H. and Gales, N. (2006) Interpreting short-term behavioural responses to disturbance within a longitudinal perspective. Animal Behaviour, 72 (5). pp. 1149-1158.

PDF - Authors' Version
Download (347kB)
Link to Published Version:
*Subscription may be required


We documented immediate, behavioural responses of Indo-Pacific bottlenose dolphins (Tursiops sp.) to experimental vessel approaches in regions of high and low vessel traffic in Shark Bay, Western Australia. Experimental vessel approaches elicited significant changes in the behaviour of targeted dolphins when compared with their behaviour before and after approaches. During approaches, focal dolphin groups became more compact, had higher rates of change in membership and had more erratic speeds and directions of travel. Dolphins in the region of low vessel traffic (control site) had stronger and longer-lasting responses than did dolphins in the region of high vessel traffic (impact site). In the absence of additional information, the moderated behavioural responses of impact-site dolphins probably would be interpreted to mean that long-term vessel activity within a region of tourism had no detrimental effect on resident dolphins. However, another study showed that dolphin-watching tourism in Shark Bay has contributed to a long-term decline in dolphin abundance within the impact site (Bejder et al., in press, Conservation Biology). Those findings suggest that we documented moderated responses not because impact-site dolphins had become habituated to vessels but because those individuals that were sensitive to vessel disturbance left the region before our study began. This reinterpretation of our findings led us to question the traditional premise that short-term behavioural responses are sufficient indicators of impacts of anthropogenic disturbance on wildlife.

Item Type: Journal Article
Murdoch Affiliation(s): Centre for Fish and Fisheries Research
Publisher: Academic Press
Copyright: © 2006 The Association for the Study of Animal Behaviour.
Item Control Page Item Control Page


Downloads per month over past year