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Cryptic diversity in the mtDNA of the ornamental fish Carnegiella strigata

Authors

  • C. H. Schneider,

    Corresponding author
    1. Laboratório de Genética Animal, Instituto Nacional de Pesquisas da Amazônia, Coordenação de Pesquisas em Biodiversidade, Manaus, Amazonas, Brazil
      Tel.: +55 92 3643 3243; email: carloshs@ inpa.gov.br
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  • M. C. Gross,

    1. Laboratório de Citogenômica Animal, Universidade Federal do Amazonas, Instituto de Ciências Biológicas, Departamento de Biologia, Manaus, Brazil
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  • M. L. Terencio,

    1. Laboratório de Genética Animal, Instituto Nacional de Pesquisas da Amazônia, Coordenação de Pesquisas em Biodiversidade, Manaus, Amazonas, Brazil
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  • J. I. R. Porto

    1. Laboratório de Genética Animal, Instituto Nacional de Pesquisas da Amazônia, Coordenação de Pesquisas em Biodiversidade, Manaus, Amazonas, Brazil
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Tel.: +55 92 3643 3243; email: carloshs@ inpa.gov.br

Abstract

Mitochondrial DNA ( mtDNA) sequences of the marbled hatchetfish Carnegiella strigata, an ornamental fish exported from the Negro River, was examined to determine its genetic diversity and population structure in blackwater rivers (Negro and Uatumã Rivers) in the central Amazon. Analyses of a 646 bp fragment of the ATPase 6/8 mtDNA gene revealed two monophyletic lineages of C. strigata with considerable genetic distance between them (10–12%), suggesting that these lineages should not be considered a single stock. Furthermore, there were strong differences in the geographical distribution of the lineages. These results indicate a past association between drainages of the Negro and Uatumã Rivers. They also suggest that, in the Negro River, its main tributary, the Branco River, may act as a geographical barrier and potentially an ecological barrier between populations of the middle and lower portions of the river.

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