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Temporal variations of genetic introgression in stocked brown trout populations
Author(s) -
Poteaux C.,
Beaudou D.,
Berrebi P.
Publication year - 1998
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1998.tb01826.x
Subject(s) - introgression , brown trout , biology , salmo , salmonidae , zoology , evolutionary biology , ecology , fishery , genetics , gene , fish <actinopterygii>
Allozymes were used to analyse the genetic impact of hatchery brown trout Salmo trutt a, morpha fario stocked in wild Mediterranean populations to gain a better understanding of the mechanisms of introgression (regulation, elimination or homogenization). Analysis of the genetic structure of populations from the same river drainage basin but subjected to different incidences was performed in space and time (data on two generations and 2 years of sampling). Introgression is associated with high deficits of heterozygotes and linkage disequilibria. Genetic divergence according to age group was observed. These results may indicate selective forces acting against domesticated genes and limiting hybridization between the two forms.