The present study was part of Carlo R. Largiadèr's PhD project. This project encompassed a survey of the genetic differentiation among brown trout populations in Switzerland and the assessment of effects of stocking on the genetic variation in autochthonous populations. Professor Adolf Scholl is studying population biology. His particular interests cover taxonomic and systematic aspects in teleostean fish and arthropods.
Genetic introgression between native and introduced brown trout Salmo trutta L. populations in the Rhone River Basin
Article first published online: 22 SEP 2009
Volume 5, Issue 3, pages 417–426, June 1996
How to Cite
LARGIADER, C. R. and SCHOLL, A. (1996), Genetic introgression between native and introduced brown trout Salmo trutta L. populations in the Rhone River Basin. Molecular Ecology, 5: 417–426. doi: 10.1046/j.1365-294X.1996.00099.x
- Issue published online: 22 SEP 2009
- Article first published online: 22 SEP 2009
- Received 23 August 1995 revised 21 November 1995 accepted 6 December 1995
- protein variation;
In the Doubs River (Rhone drainage) two distinct brown trout (S. trutta) phenotypes are observed. One phenotype is locally called Doubs trout and is characterized by four black stripes on the sides, similar to perch (Perca fluviatilis L.) and the other is the common phenotype of the fluviatile ecotype of brown trout, Salmo trutta f. fario. Protein data for three samples from the Doubs show that the Doubs trout belongs to the Mediterranean population group of brown trout, whereas the fario phenotype originates from stocking with hatchery strains of Atlantic basin origin. The two forms, however, do not hybridize freely. This is indicated by considerable gametic phase disequilibrium between alleles of hatchery and Doubs trout at one sampling site, and by lack of intermediate genotypes and phenotypes at another sampling site. The introgression patterns observed at the two sites suggest that differences in local habitat conditions can affect the degree of hybridization and introgression.