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Cytogenetic identification of invasive fish species following connections between hydrographic basins

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Abstract

Chromosome analyses were carried out for several fish species in a region impacted by the connection between two hydrographic basins, where a river originally pertaining to the Paraná River basin was transposed to the São Francisco River basin in the state of Minas Gerais, Brazil. The purpose was to assess the dispersal of invasive species from one hydrographic basin to the other and the consequent new geographical distributions of species that had been previously isolated from each other. Species of the families Parodontidae (Apareiodon piracicabae, A. ibitiensis, Parodon hilarii, and P. nasus), Sternopygidae (Eigenmannia virescens), and Gymnotidae (Gymnotus sylvius) were studied. The four species of Parodontidae had 2n = 54 chromosomes, but species-specific karyotype structures, including the presence of the ZZ/ZW sex chromosome system in A. ibitiensis and P. hilarii. Two distinct karyomorphs (A and B) were identified for E. virescens, although with the same diploid number (2n = 38 chromosomes). G. sylvius had 2n = 40 chromosomes. P. hilarii and E. virescens (karyomorph B) are considered to be native to the São Francisco River basin, whereas A. piracicabae, A. ibitiensis, E. virescens (karyomorph A), and G. sylvius are known for the Paraná River basin, and P. nasus is known for the Paraná-Paraguay basin. The presence of the last five species in the São Francisco River basin indicates that they migrated from the Parana River to the São Francisco River basin due to the transposition of the river, and can therefore be considered invasive species in this basin. Moreover, a natural migratory pathway through the former wetland may have affected this dispersal.

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Acknowledgments

The authors are grateful to IBAMA (Instituto Brasileiro do Meio Ambiente (IBAMA/MMA) and to the Instituto Estadual de Floresta (IEF-MG), for authorizing the capture of the fish. This study was financed by FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo), CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), and the Araucária Foundation (Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Estado).

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Correspondence to Vladimir Pavan Margarido.

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Handling editor: David Dudgeon

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Bellafronte, E., Moreira-Filho, O., Vicari, M.R. et al. Cytogenetic identification of invasive fish species following connections between hydrographic basins. Hydrobiologia 649, 347–354 (2010). https://doi.org/10.1007/s10750-010-0277-9

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  • DOI: https://doi.org/10.1007/s10750-010-0277-9

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