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Comparative population genetics and demographic history of two polychaete species suggest that coastal lagoon populations evolve under alternate regimes of gene flow

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Abstract

Here, we compare the population genetic structure and the demographic history of two polychaete species along one bay and eight coastal lagoons distributed over ~ 200 km of the Southwest Atlantic to understand the evolution of discontinuous and confined inland ocean-connected waters populations. A total of 515 sequences of COI and 16S were obtained for Laeonereis culveri and Capitella nonatoi. Levels of genetic diversity and population genetic structure were higher for C. nonatoi than L. culveri, possibly reflecting the differences in life-history strategies. Furthermore, the genetic diversity of both species was, in general, smaller in more confined populations. Populations of both species showed signs of recent demographic expansion, although it was more pronounced in C. nonatoi. As the population size of both species may reach high densities in highly eutrophic environments, these expansions are probably associated to the coastal lagoon formation, which favors the process of organic matter accumulation and the water oxygenation reduction. The general pattern of haplotype distribution revealed high levels of haplotype sharing among populations, mainly in L. culveri. On the other hand, the observed number of exclusive haplotypes indicates that the genetic exchange among populations is not as high as it may seem. This result suggests that coastal lagoons populations evolve under alternate regimes of soft (physiological barriers) and strong (physiological and physical barriers) gene flow restriction.

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Acknowledgements

The authors would like to thank the Coordination for the Improvement of Higher Education Personnel (CAPES—PROEX/0487, Education Ministry Brazil) for the Ph.D. and postdoctoral fellowship for VCS and the National Science and Technology Council (CNPq, Science and Technology Brazil) for the fellowships to PCP and to CAMR. The authors also thank Dr. Christine Ruta for providing samples of the Visgueiro Lagoon, and Dr. Antônio M. Solé-Cava for providing the facilities of Laboratório de Biodiversidade Molecular (UFRJ) for sequencing samples. We thank the reviewers for the valuable comments. This paper is part of the Ph.D. requirements for VCS at the Genetics Graduate Program of the Federal University of Rio de Janeiro. This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (BR) (Grant No. 308387/2015-5), Nacional de Desenvolvimento Científico e Tecnológico (Grant No. 443900/2014-0).

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Correspondence to Claudia Augusta de Moraes Russo.

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Responsible Editor: C. Eizaguirre.

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Seixas, V.C., Paiva, P.C. & Russo, C.A.d.M. Comparative population genetics and demographic history of two polychaete species suggest that coastal lagoon populations evolve under alternate regimes of gene flow. Mar Biol 165, 179 (2018). https://doi.org/10.1007/s00227-018-3437-5

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  • DOI: https://doi.org/10.1007/s00227-018-3437-5

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