Distribution of non-native trout in Slovenia and their introgression with native trout populations as observed through microsatellite DNA analysis
Rozman, Tamara, genetik, 1974- ; Berrebi, P. ; Snoj, Aleš
In Slovenia, the Adriatic basin inhabited by native marble trout (S. marmoratus), and the Danubian basin inhabited by native Dunabian lineage of brown trout (S. trutta) have been intensively affected ...by stocking with non-native trout strains. In order to asses spread of non-native strains and their introgression with native trout, a population study based on five microsatellite loci was applied across ten marble and ten brown trout populations, ranging from allegedly non-introgressed to heavily managed. On the basis of correspondence analysis, which revealed three clear grouping consisting of the Danubian and Atlantic lineages of brown trout and the marble trout, the alleles, characterisitc of each grouping were identified and used for estimating genetic composition of each population according to the three possible origins. Among the wild populations, five marble and one brown trout populations were found to be pure; all the others were introgressed withexotic alleles (Atlantic and marmoratus alleles in the Danubian basin and Atlantic and Dunabian in the Adriatic basin) that markedly dominate intensively managed populations. As revealed by non-significant F1S values, panmixia between native and introduced fishes has for the most part already been reached. Our research showed that it is not only marble trout whose identity is endangered in Slovenia but also the existence of autochthonous Danubian brown trout is critically compromised, which is new information to betaken into account for local trout conservation.
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