[MARMAM] Fwd: New publication - Population genetics of coastal common bottlenose dolphins in Southwestern Atlantic

Pedro Fruet pfruet at gmail.com
Wed Apr 2 21:49:45 PDT 2014

Dear all,

We are glad to announce a recent publication in Conservation Genetics:

*"Remarkably low genetic diversity and strong population structure in
common bottlenose dolphins (Tursiops truncatus) from coastal waters of the
Southwestern Atlantic Ocean". Conservation Genetics. *(DOI)

Authors: Pedro F. Fruet; Eduardo R. Secchi; Fábio Daura-Jorge; Els
Vermeulen; Paulo A. C. Flores; Paulo César Simões-Lopes; Rodrigo Cézar
Genoves; Paula Laporta; Juliana C. Di Tullio; Thales Renato O. Freitas; Luciano
Dalla Rosa; Victor Hugo Valiati; Luciano B. Beheregaray; Luciana M. Moller


Knowledge about the ecology of bottlenose dolphins in the Southwestern
Atlantic Ocean is scarce. Increased by-catch rates over the last decade in
coastal waters of southern Brazil have raised concerns about the decline in
abundance of local dolphin communities. Lack of relevant data, including
information on population structure and connectivity, have hampered an
assessment of the conservation status of bottlenose dolphin communities in
this region. Here we combined analyses of 16 microsatellite loci and
mitochondrial DNA (mtDNA) control region sequences to investigate genetic
diversity, structure and connectivity in 124 biopsy samples collected over
six communities of photographically identified coastal bottlenose dolphins
in southern Brazil, Uruguay and central Argentina. Levels of nuclear
genetic diversity were remarkably low (mean values of allelic diversity and
heterozygosity across all loci were 3.6 and 0.21, respectively), a result
that possibly reflects the small size of local dolphin communities. On a
broad geographical scale, strong and significant genetic differentiation
was found between bottlenose dolphins from southern Brazil-Uruguay (SB-U)
and Baia San Antonio (BSA), Argentina (AMOVA mtDNA ΦST = 0.43; nuclear FST =
0.46), with negligible contemporary gene flow detected based on Bayesian
estimates. On a finer scale, moderate but significant differentiation
(AMOVA mtDNA ΦST = 0.29; nuclear FST = 0.13) and asymmetric gene flow was
detected between five neighbouring communities in SB-U. Based on the
results we propose that BSA and SB-U represent two distinct Evolutionarily
Significant Units (ESUs), and that communities from SB-U comprise five
distinct Management Units (MUs). Under this scenario, conservation efforts
should prioritize the areas in Southern Brazil where dolphins from three
MUs overlap in their home ranges and where by-catch rates are reportedly

The article is fully accessible to all users at libraries and institutions
that have purchased a SpringerLink license.


PDF of the article can be requested by sending an email to pfruet at gmail.com



Pedro F. Fruet
Universidade Federal do Rio Grande
Museu Oceanográfico
Rio Grande, RS, Brasil.
email:  pfruet at gmail.com <pfruet at gmail.com.br>
Molecular Ecology Lab.
Flinders University, SA
e-mail: pedro.fruet at flinders.edu.au
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