IMPLICAÇÃ-ES GENÉTICAS DOS PROGRAMAS DE REPOVOAMENTO DE POPULAÇÃ-ES SELVAGENS DE CURIMBA <i>Prochilodus lineatus<i>
DOI:
https://doi.org/10.20950/1678-2305.2019.45.3.497Palavras-chave:
recursos pesqueiros, curimbatá, peixes de água doce, genética de populaçíµes, repovoamentoResumo
A diversidade genética das populações selvagens e cultivadas é crucial, tanto para a conservação dos recursos pesqueiros como para o desenvolvimento da piscicultura. Para inferir a diversidade genética e estrutura populacional do curimba Prochilodus lineatus, indivíduos foram amostrados, entre 2007- 2009, em quatro fazendas de peixes e da Bacia do Alto Uruguai, ambas no sul do Brasil. A estrutura populacional foi identificada em indivíduos cultivados e selvagens, através de sete locos microssatélites. A análise bayesiana indicou três grupos principais, incluindo dois grupos oriundos de pisciculturas. A diferenciação genética par-a-par revelou estrutura espacial entre e dentro de populações selvagens e cultivadas; no entanto, o desenho amostral não permitiu testar a estrutura temporal de acordo com o isolamento por tempo (IBT), o que significa que as populações podem reproduzir dentro da mesma distribuição geográfica, mas reproduzir em diferentes momentos. Os indivíduos cultivados apresentaram menor diversidade, riqueza alélica e tamanho efetivo populacional, porém maiores taxas de endogamia, quando comparados í s populações selvagens. Estas características constituem sinais de alerta contra o repovoamento indiscriminado de populações naturais de Prochilodus lineatus, uma espécie sensível a habitats fragmentados, com peixes oriundos de pisciculturas.
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