Abstract
Curimata-pioa (Prochilodus costatus) and curimatapacu (Prochilodus argenteus) are migratory fish species endemic to the Sao Francisco River Basin in Brazil. Both species play important roles in local fisheries and ecology in the Paraopeba River. A dam was recently constructed on this river and to help in the development and conservation programs, we characterized the genetic variation of both species before dam construction. Complex hypervariable repeats microsatellite was used to asses genetic variation for both species within and between the five collection sites in order to detect population substructuring. Nucleotide substitutions and insertion/deletion polymorphisms (indels) resulted in 35 P. costatus haplotypes (sample size = 89) and 22 P. argenteus haplotypes (sample size = 32). Significant genetic diversity and population differentiation was detected between five sampling sites for both species. Therefore, each of the five sites should be regarded as a group comprising significant genetic differences in species conservation and maintenance plans. Comparing these results to genetic diversity measures after dam construction will be critical for future management in this region.
Highlights
In South American rivers, Prochilodus species are conspicuous, abundant, and widely distributed freshwater fish [1]
Prochilodus costatus Valenciennes known as curimatã-pioa and Prochilodus argenteus Agassiz known as curimatãpacu are endemic to the São Francisco River Basin in Brazil
Site I was at the Paraopeba River immediately downstream the Igarapé Thermoelectric Power Plant (ITH), and the remaining four sites were in marginal lagoons: Rio Velho, Chiqueiro, Piranhas, and Barra do Rio
Summary
In South American rivers, Prochilodus species are conspicuous, abundant, and widely distributed freshwater fish [1]. They support important fisheries in many parts of the continent. Prochilodus costatus Valenciennes known as curimatã-pioa and Prochilodus argenteus Agassiz known as curimatãpacu are endemic to the São Francisco River Basin in Brazil. Within the river, these benthopelagic, detritivorous species play a critical role in cycling organic material [6,7,8]. These species must be considered in reproductive management and conservation programs in this basin
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