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Behavioural changes of nursing female Indo-Pacific bottlenose dolphins in response to boat based tourism

Lookup NU author(s): Professor Per Berggren


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We investigated the behavioural changes of Indo-Pacific bottlenose dolphins Tursiops aduncus in response to boat-based tourism at both group and individual levels. The behaviour, movement and dive patterns of nursing females off the south coast of Zanzibar were investigated between January and March 2000 to 2002 and statistical comparisons were made between observations made at different levels of tourist activity. Behavioural data was collected during boat surveys using scansampling of groups and focal individual follows of 5 female dolphins with calves. The movement patterns of dolphin groups were not affected by the presence of a few (1 to 2) tourist boats without swimmers. However, the groups displayed a significantly larger proportion of erratic (non-directional) movements as tourist activities increased and when swimmers were present. The proportion of active, peduncle, tail-out and porpoise dives also increased as tourist activity increased. Further, females travelled more frequently as tourist activities increased; this may have a negative effect on the time available for females to nurse their calves. Intense non-regulated dolphin tourism in this areamay lead to a shift in habitat use by nursing females, and the apparent changes in dolphin behaviour due to the increased levels of tourism may ultimately reduce fitness at both individual and population levels. We urge that the guidelines already issued by the Department of Fisheries and Marine Products, Zanzibar, be implemented and complied with as a first important step towards sustainable dolphin tourism.

Publication metadata

Author(s): Stensland E, Berggren P

Publication type: Article

Publication status: Published

Journal: Marine Ecology Progress Series

Year: 2007

Volume: 332:

Pages: 225–234

Print publication date: 05/03/2007

ISSN (print): 0171-8630

ISSN (electronic): 1616-1599

Publisher: Inter-Research


DOI: 10.3354/meps332225


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