Genetic introgression between native and introduced brown trout Salmo trutta L. populations in the Rhone River Basin

Abstract

In the Doubs River (Rh6ne drainage) two distinct brown trout (S. tnrtta) 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 i s the common phenotype of the fluviatile ecotype of brown trout, Salmo tnrtti f. firio. 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.

Dynamique Temporelle De La Contribution Du Repeuplement en Stades Précoces De Truite (Salmo Trutta L.) Dans La Population en Place Et Dans La Pêche Sur Le Doubs Franco-Suisse.

“…Une étude génétique (LARGIADER et SCHOLL, 1996) a montré que la truite autochtone du Doubs appartient au rameau évolutif méditerranéen. Or la plupart des souches de repeuplement utilisées dans le Doubs franco-suisse jusque dans les années 90 étaient originaires de stocks domestiques de forme atlantique, même si une part limitée provenait de croisements entre des géniteurs atlantiques domestiques et des truites sauvages, le plus souvent mâles.…”

Postglacial colonization of brown trout in Europe based on distribution of allozyme variants

“…Also pertinent is the exclusive presence of the LDH-A2*100QL allele in a tributary of the upper Rhone river (data in Largiadèr & Scholl, 1996), as discussed in greater detail below.…”

One Fish, Two Fish, Old Fish, New Fish—Is the Biodiversity of Bulgarian Native Brown Trout (S. Trutta Fario) Populations at Risk?

“…early emerging fry may be dominant to late emerging fry, therefore, the several days of difference between hatching times described by Álvarez and Garcia-Vazquez (2) might be crucial to establishing residence effects (2,39). it has been reported that hatchery and free-living brown trout can and do interbreed (13,18,21). in any case, a passive attitude towards the possible outcomes for the biodiversity is not a viable option.…”