new publications on tourism impact on Indo-Pacific bottlenose dolphins
Dear Marmamers, I am pleased to announce two new publications: Steckenreuter, A., Harcourt, R., Möller, L. (2012). Are Speed Restriction Zones an effective management tool for minimising impacts of boats on dolphins in an Australian marine park? *Marine Policy* 36: 258-264. http://www.sciencedirect.com/science/article/pii/S0308597X11001023 Abstract The small, genetically distinct population of Indo-Pacific bottlenose dolphins (*Tursiops aduncus*) in Port Stephens, New South Wales (NSW), is the target of the largest dolphin-watching industry in Australia and falls within the recently created Port Stephens—Great Lakes Marine Park. The effectiveness of Speed Restriction Zones (SRZs) as a management tool in this area was investigated during their second year of implementation by comparing dolphin usage and behaviour to adjacent Control Zones (CZs) of similar habitat. For this purpose, boat-based surveys and focal follows of dolphin groups were carried out in the zones between August 2008 and August 2009. Results showed that SRZs were more intensely used by dolphin-watching boats in summer. There was no change in dolphins’ behaviour and group structure in the presence of dolphin-watching boats in SRZs when compared to dolphin groups within CZs in any season. Dolphin groups including calves used SRZs less during summer. The latter may indicate a shift in area utilisation for those groups during intense boat traffic by dolphin-watching operators. CZs were more important than SRZs as foraging grounds for dolphins in summer. This indicates that SRZs as specified are not effective at minimising boating impacts and that the location of these zones should in time be revised. This is important information for management of dolphin-watching within this marine park and an example of adaptive management in progress. Moreover these results are relevant for conservation of dolphins and the management of dolphin-watching industries elsewhere, particularly new industries, where management strategies may incorporate marine protected areas including zoning plans. Steckenreuter, A., Harcourt, R., Möller, L. (2011). Distance does matter: close approaches by boats impede feeding and resting behaviour of Indo-Pacific bottlenose dolphins. *Wildlife Research *38: 455-463. http://www.publish.csiro.au/nid/144/paper/WR11048.htm *Abstract* *Context:* Potential impacts of human disturbance on animal populations can be measured as behavioural responses and may affect the survival and fecundity of animals. In areas where human–wildlife interactions occur, conservation management needs to be in place to secure both a viable tourism industry and the sustainability of the targeted species. *Aims:* We sought to evaluate whether different approach distances by boat have effects on the behaviour and group cohesion of dolphins that are targeted by Australia’s largest dolphin-watching industry. *Methods:* The effects of different approach distances of boats on the behavioural states of dolphins, group dispersal and direction of movement were investigated in this area by controlled boat experiments conducted between August 2008 and December 2009. *Key results:* Results showed that there was significantly less feeding when boats approached dolphin groups to a distance of 50 m than when they did to a distance of 150 m, or with controlled approaches. Resting was also observed significantly less when boats approached to a distance of 50 m than when they approached to a distance of 150 m. The dispersal of dolphin groups was significantly tighter (less dispersed) when boats approached to 50 m than that with 150-m-distance or controlled approaches. Furthermore, the dolphins’ direction of movement was less neutral when the experimental boat approaches were carried out at a distance of 50 m than when they were carried out at a distance of 150 m, or with controlled approaches. Similar results were also obtained for dolphin groups including calves. *Conclusions:* On the basis of the results from this study, we recommend that the existing New South Wales regulations, which stipulate that dolphin-watching boats keep a distance of 50 m to groups with adults only and 150 m to groups with calves, are maintained within the Port Stephens–Great Lakes Marine Park (PSGLMP). *Implications:* Management plans whose stated goals include both sustainability of a dolphin-watching industry and longer-term viability of a dolphin population may reconcile conflicting objectives and improve their decision making by using these empirical measures rather than best guesses. -- Regards, Andre Steckenreuter ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PhD Candidate Marine Mammal Research Group Graduate School of the Environment Macquarie University, 2109 NSW, Australia Ph: 0410862189 Email: andre.steckenreuter@mq.edu.au ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Andre Steckenreuter