Microsatellite data reveal fine genetic structure in male Guiana dolphins (<Emphasis Type="Italic">Sotalia guianesis)</Emphasis> in two geographically close embayments at south-eastern coast of Brazil |
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Authors: | Claudia Hollatz Leonardo Flach C Scott Baker Fabrício R Santos |
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Institution: | 1.Laboratório de Biodiversidade e Evolu??o Molecular, Departamento de Biologia Geral, ICB,Universidade Federal de Minas Gerais,Belo Horizonte,Brazil;2.Projeto Boto-cinza,Mangaratiba,Brazil;3.Department of Fisheries and Wildlife, Marine Mammal Institute,Oregon State University,Newport,USA |
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Abstract: | A large macrogeographic differentiation has been observed among Sotalia guianensis populations along the South American coast. However, no genetic structure has been detected so far in closely distributed
populations of this species, even though it has been observed in other cetaceans. Here, we examined the fine scale population
structure for the largest populations of S. guianensis inhabiting Sepetiba and Paraty embayments at the south-eastern coast of Rio de Janeiro, Brazil. Analysis of mitochondrial
DNA (mtDNA) control region sequences failed to detect variability among sequences. Conversely, evidence of significant male
population structure was found on the basis of ten nuclear microsatellite loci. Surprisingly, the microsatellite markers were
able to distinguish between individuals from the two embayments located 60 km apart. The results suggest that differences
in habitat type and behavioral specializations are likely to explain the patterns of genetic structure. These findings should
provide baselines for the management of communities exposed to increasing human-driven habitat loss. |
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