Dear colleagues, The following paper was recently published online:
A Worldwide Perspective on the Population Structure and Genetic Diversity of Bottlenose Dolphins (Tursiops truncatus) in New Zealand. Journal of Heredity, doi:10.1093/jhered/esn039 PDF available in the Journal of Heredity website: http://jhered.oxfordjournals.org/cgi/reprint/esn039? ijkey=xYR4BtMaKKOjcVR&keytype=ref Or upon request: [EMAIL PROTECTED] Authors: Gabriela Tezanos-Pinto, Charles Scott Baker, Kirsty Russell, Karen Martien, Robin W. Baird, Alistair Hutt, Gregory Stone, Antonio A. Mignucci-Giannoni, Susana Caballero, Tetusya Endo, Shane Lavery, Marc Oremus, Carlos Olavarría and Claire Garrigue. Abstract: Bottlenose dolphins (Tursiops truncatus) occupy a wide range of coastal and pelagic habitats throughout tropical and temperate waters worldwide. In some regions, "inshore" and "offshore" forms or ecotypes differ genetically and morphologically, despite no obvious boundaries to interchange. Around New Zealand, bottlenose dolphins inhabit 3 coastal regions: Northland, Marlborough Sounds, and Fiordland. Previous demographic studies showed no interchange of individuals among these populations. Here, we describe the genetic structure and diversity of these populations using skin samples collected with a remote biopsy dart. Analysis of the molecular variance from mitochondrial DNA (mtDNA) control region sequences (n = 193) showed considerable differentiation among populations (FST = 0.17, ST = 0.21, P < 0.001) suggesting little or no female gene flow or interchange. All 3 populations showed higher mtDNA diversity than expected given their small population sizes and isolation. To explain the source of this variation, 22 control region haplotypes from New Zealand were compared with 108 haplotypes worldwide representing 586 individuals from 19 populations and including both inshore and offshore ecotypes as described in the Western North Atlantic. All haplotypes found in the Pacific, regardless of population habitat use (i.e., coastal or pelagic), are more divergent from populations described as inshore ecotype in the Western North Atlantic than from populations described as offshore ecotype. Analysis of gene flow indicated long-distance dispersal among coastal and pelagic populations worldwide (except for those haplotypes described as inshore ecotype in the Western North Atlantic), suggesting that these populations are interconnected on an evolutionary timescale. This finding suggests that habitat specialization has occurred independently in different ocean basins, perhaps with Tursiops aduncus filling the ecological niche of the inshore ecotype in some coastal regions of the Indian and Western Pacific Oceans. Best regards, Gabriela de Tezanos Pinto PhD Candidate Population Genetics & Evolution Lab The University of Auckland Private Bag 92019, Auckland New Zealand http://www.science.auckland.ac.nz/uoa/science/news/2005/10/dolphin.cfm ·´¯`·.¸¸..><((((º>.·´¯`·.¸¸.·´¯`·.¸><((((º>`·.¸¸.·´¯`·.¸><((((º>`·.¸
Dear colleagues, The following paper was recently published: Tourism affects the behavioural budget of the common dolphin (Delphinus sp.) in the Hauraki Gulf, New Zealand Karen A Stockin, David Lusseau, Vicky Binedell, Nicky Wiseman and Mark B. Orams (2008) Marine Ecology Progress Series:355, 287-295 ABSTRACT: Common dolphins Delphinus sp. are frequently targeted by tourism operations in New Zealand waters, yet there is a paucity of data on potential impacts faced by this species. Transition matrix models, used widely in population ecology, have recently been applied to behavioural transitions in order to provide successful management guidelines. We detail the use of Markov chain models to assess the impact of tourism activities on the behavioural state of common dolphins in the Hauraki Gulf, New Zealand. First-order time discrete Markov chain models were used to describe transition probabilities in both control and impact scenarios. The effect of boat interactions was quantified by comparing transition probabilities of both control and impact chains. Foraging and resting bouts were significantly disrupted by boat interactions to a level that raises concern about the sustainability of this impact. Both the duration of bouts and the overall time spent in these 2 behavioural states decreased. Foraging dolphins took significantly longer to return to their initial behavioural state in the presence of the tour boat. There was also an increased preference to shift behaviour to socialising or milling after tour boat interactions. Impacts identified in the present study are similar to those previously reported for bottlenose dolphins, a coastal species typically considered to be more susceptible to cumulative anthropogenic impacts. PDF requests available from Karen Stockin at [EMAIL PROTECTED] Best wishes, Karen ========================================= Karen A Stockin Research Officer Coastal - Marine Research Group Institute of Natural Resources Massey University at Albany Private Bag 102 904 North Shore MSC New Zealand Tel: + 64 9 414 0800 Ext 41127 Fax: + 64 9 443 9790 Cell: + 64 21 146 5511 Email: <mailto:[EMAIL PROTECTED]> [EMAIL PROTECTED] <http://cmrg.massey.ac.nz> http://cmrg.massey.ac.nz <http://wildlife.massey.ac.nz/people/staff_ks.asp> http://wildlife.massey.ac.nz/people/staff_ks.asp =========================================
|
Dear colleagues, The
following paper was recently published: Tourism
affects the behavioural budget of the common dolphin (Delphinus sp.) in the Karen A
Stockin, David Lusseau, Vicky Binedell, Nicky Wiseman and Mark B. Orams (2008) Marine Ecology
Progress Series:355, 287-295 ABSTRACT:
Common dolphins Delphinus sp. are
frequently targeted by tourism operations in New Zealand waters, yet there is a
paucity of data on potential impacts faced by this species. Transition matrix
models, used widely in population ecology, have recently been applied to
behavioural transitions in order to provide successful management guidelines.
We detail the use of Markov chain models to assess the impact of tourism
activities on the behavioural state of common dolphins in the Hauraki Gulf, New
Zealand. First-order time discrete Markov chain models were used to describe
transition probabilities in both control and impact scenarios. The effect of
boat interactions was quantified by comparing transition probabilities of both
control and impact chains. Foraging and resting bouts were significantly
disrupted by boat interactions to a level that raises concern about the
sustainability of this impact. Both the duration of bouts and the overall time
spent in these 2 behavioural states decreased. Foraging dolphins took
significantly longer to return to their initial behavioural state in the
presence of the tour boat. There was also an increased preference to shift
behaviour to socialising or milling after tour boat interactions. Impacts
identified in the present study are similar to those previously reported for
bottlenose dolphins, a coastal species typically considered to be more
susceptible to cumulative anthropogenic impacts. PDF requests
available from Karen Stockin at [EMAIL PROTECTED]
Best wishes, Karen ========================================= Karen A Stockin Research Officer Coastal
- Marine Research Group Institute of Tel: + 64 9 414 0800 Ext 41127 Fax: + 64 9 443 9790 Cell: + 64 21 146 5511 Email: [EMAIL PROTECTED] http://wildlife.massey.ac.nz/people/staff_ks.asp ========================================= |
_______________________________________________ MARMAM mailing list MARMAM@lists.uvic.ca https://lists.uvic.ca/mailman/listinfo/marmam
_______________________________________________ MARMAM mailing list MARMAM@lists.uvic.ca https://lists.uvic.ca/mailman/listinfo/marmam
