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Remarkably low genetic diversity and strong population structure in common bottlenose dolphins (Tursiops truncatus) from coastal waters of the Southwestern Atlantic Ocean |
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| 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. Möller |
| Affiliation: | 1. Programa de Pós-Gradua??o em Oceanografia Biológica, FURG, Rio Grande, Brazil 2. Molecular Ecology Laboratory, School of Biological Sciences, Flinders University, Bedford Park, SA, Australia 3. Museu Oceanográfico “Prof. Eliézer C. Rios”, FURG, Rio Grande, Brazil 4. Laboratório de Ecologia e Conserva??o da Megafauna Marinha, Instituto de Oceanografia, FURG, Rio Grande, Brazil 5. Cetacean Ecology, Behaviour and Evolution Lab, School of Biological Sciences, Flinders University, Bedford Park, SA, Australia 6. Laboratório de Mamíferos Aquáticos (LAMAQ), UFSC, Florianópolis, Brazil 7. Laboratory of Oceanology - MARE Research Centre, University of Liege, Liège, Belgium 8. Centro Nacional de Pesquisa e Conserva??o de Mamíferos Aquáticos - CMA, ICMBio, MMA, Florianópolis, Brazil 9. Yaqu-pacha Uruguay, Punta del Diablo, Rocha, Uruguay 10. Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil 11. Laboratório de Biologia Molecular, Unisinos, S?o Leopoldo, Brazil |
| Abstract: | 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 Bahía 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, 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 higher. |
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