Data/hora: 09/06/2024 17:30:05

Provedor de dados: | 83
País: | Brazil
Título: | Genetic diversity and aquaculture conservation for a threatened Neotropical catfish
Autores: | Farias,Renata S.; Silva,Bruno C. N. R.; Nascimento,Wilka V. G.; Silva,Gênison C.; Luz,Ronald K.; Prosdocimi,Francisco; Figueiredo,Rozzanno A. C. R.; Carvalho,Daniel C.; Coimbra,Maria R. M.
Data: | 2020-01-01
Ano: | 2020
Palavras-chave: | Lophiosilurus alexandri; Low genetic diversity; Relatedness estimator; Restocking; Sedentary behavior.
Resumo: | Abstract Due to the ecological importance of Lophiosilurus alexandri, the present work evaluated its genetic representativeness by comparing wild stocks to broodstocks that were kept at three restocking hatcheries along the São Francisco River. A total of 97 samples were genotyped for newly developed microsatellite markers. Low levels of genetic diversity (average alleles number of 4.2 alleles) were detected in all cases, being more severe in captive groups. Significant pairwise FST and DEST values, Structure, and DAPC analyses showed that wild animals were structured in two groups, and a third group was formed by captive animals, evidencing the need to adopt genetic criteria to retain genetic diversity in the hatcheries. For this reason, three full-sib families were constructed to select the best relatedness estimator for L. alexandri and establish a cut-off value aimed to avoid full-sibling matings in the hatcheries. Two estimators, Wang (RW) and Lynch &amp; Li (RLL), were accurate in reflecting the relatedness level for full-sibs in this species. According to them, less than 50% of the potential breeding matings in the three hatcheries are advisable. The innate low diversity of L. alexandri highlights the importance of minimizing inbreeding and retaining genetic diversity towards the species recovery.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000300211
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/1982-0224-2020-0028
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.18 n.3 2020
Fonte: | info:eu-repo/semantics/openAccess