Abstract
Marine species tend to exhibit relatively less population structuring than terrestrial species owing to fewer barriers to gene flow and increased connectivity resulting from greater dispersal abilities. Thus, in many cases, life history plays a more important role in phylogeography of marine taxa than do oceanographic features. Littoral species are of particular phylogeographic interest because they possess life histories that have both marine and terrestrial characteristics. This study evaluates the synergistic impact of divergent ocean currents and a high larval dispersal potential on the phylogeography of the fiddler crab, Uca maracoani, distributed along the coast of Brazil. Patterns of genetic variation were assessed with sequence data for a portion of the mitochondrial COI gene and AFLPs. Geometric morphometric techniques were used to evaluate morphological variation. Results revealed a lack of discernible genetic subdivision. However, geometric morphometrics showed statistically significant morphological differentiation. The absence of a clear phylogeographic pattern appears to be determined primarily by life history characteristics permitting a high level of connectivity. One, or a combination of several factors, may explain the incongruity between genetic and morphologic signatures, including phenotypic plasticity, incomplete lineage sorting, or recent and ongoing genetic divergence.
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Acknowledgments
We graciously acknowledge the agencies and institutions that supported this research financially, logistically, and by providing permits: the University of Northern Iowa (UNI) Department of Biology Undergraduate Research Program; UNI Summer Undergraduate Research Program; the UNI College of Natural Sciences; the UNI Graduate College; the US Fish and Wildlife Service; the Fulbright Foundation; the University of Iowa Center for Global Regional Environmental Research; the Conselho Nacional de Desenvolvimento Científico e Tecnológico (Grants 300662/2009-2 to JCM, and 450320/2010-3 to JCM and CLT); the Fundação de Amparo à Pesquisa do Estado de São Paulo (Grant 2009/50799-0 to JCM and CLT); the Coordenadoria de Aperfeiçoamento de Pessoal de Ensino Superior; and the Centro de Biologia Marinha/USP at São Sebastião, SP. Specimen collection and export of tissues and extracted DNA were authorized by the Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis (IBAMA, permits #2009/18559-1 and #2010/23976-1 to JCM). We also thank Dr. Gary and Myrna Floyd who kindly provided undergraduate financial support for A. C. Wieman; K. H. Fehlauer-Ale, L. C. Branco, and Samuel C. Faria (USP, Brazil) for assistance with initial DNA extractions and field work; K. Berge, S. Holmes and J. Woodin (UNI) for laboratory assistance; and A.R. Warwick (Florida State University) for comments on the manuscript.
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Communicated by C. Riginos.
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Wieman, A.C., Berendzen, P.B., Hampton, K.R. et al. A panmictic fiddler crab from the coast of Brazil? Impact of divergent ocean currents and larval dispersal potential on genetic and morphological variation in Uca maracoani . Mar Biol 161, 173–185 (2014). https://doi.org/10.1007/s00227-013-2327-0
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DOI: https://doi.org/10.1007/s00227-013-2327-0