[MARMAM] New paper - Ecology and comparison of coastal and offshore bottlenose dolphins

Maddalena Bearzi mbearzi at earthlink.net
Wed Jun 24 10:09:48 PDT 2009


> Dear Colleagues,
> 
> This is to announce a new paper in the current issue of Marine and Freshwater
> Research entitled "Ecology and comparison of coastal and offshore bottlenose
> dolphins (Tursiops truncatus) in California² (M. Bearzi, C.A. Saylan and A.
> Hwang)
> 
> Abstract 
> Populations of coastal and offshore bottlenose dolphins (Tursiops truncatus)
> are considered to differ ecologically, with implications for their protection
> and management. We assessed occurrence, distribution and behaviour of coastal
> and offshore populations of dolphins during a photo-identification study in
> Santa Monica Bay and nearby areas (1997­2007). Bottlenose dolphins occurred
> year-round and were encountered on 44.2% of all surveys (n = 425). We
> photo-identified 647 individuals; of these, 375 (58.0%) were coastal (<1 km
> from shore), 241 (37.2%) offshore (1­65 km from shore) and 31 were both
> (4.8%). Dolphins mostly travel (69.0%) and travel-dive (61.5%), with offshore
> dolphins socialising more (22.6%) than coastal. There were low re-sighting
> rates for both coastal and offshore dolphins. Low re-sighting rates of coastal
> individuals provide little evidence of year-round site fidelity, suggesting
> their range is greater than the study area. Several individuals were
> re-sighted between and over 1-year periods, often foraging. This suggests that
> coastal dolphins: (1) are highly mobile within inshore waters, but spend time
> foraging in the study area, and (2) range >1 km from shore, contrary to what
> has been previously reported.
> 
> 
> The article is available on the journal site:
> http://www.publish.csiro.au/nid/126/paper/MF08279.htm
> 
> 
>  Regards,
> 
> 
> Maddalena Bearzi
> 
> ______________________________
> Maddalena Bearzi, Ph.D.
> Ocean Conservation Society, President
> P.O. Box 12860
> Marina del Rey, CA 90295 - USA
> ph.310.8225205, fax 310.8225729
> mbearzi at earthlink.net
> http://www.oceanconservation.org
> 
> 
> 
> 


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