Breakdown of the brown trout evolutionary history due to hybridization between native and cultivated fish

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Genetic changes in the population structure of brown trout Salmo trutta in the eastern Pyrenees were monitored during the 1990s. Stocking with cultivated exogenous fish has resulted in introgressed populations where those with higher introgression coefficients also have the highest values of heterozygosity. Nevertheless, this increase of local diversity reflects a decrease of genetic differentiation between populations and loss of native alleles. These changes obscure native gene pools and modify evolutionary distinctions among native brown trout populations.

Keywords: Salmo trutta; evolutionary history; hybridization; introgression; stocking

Document Type: Regular Paper


Affiliations: Laboratori d’Ictiologia Genètica, Universitat de Girona, Campus Montilivi s/n, E-17071 Girona, Spain

Publication date: December 1, 2004

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