engleski

Phylogenetic lineages of brown trout in Gacka River, Croatia

Genetic variation of brown trout, Salmo trutta L., has been extensively studied throughout Europe. Such studies have demonstrated five distinct phylogenetic lineages defined by mitochondrial DNA (mtDNA) control region sequences. Croatia is an important geographic region where no systematic studies of genetic variation have been made. MtDNA control region variation from 9 individuals originating from Gacka River were analysed, in order to assess their phylogenetic lineages affiliation, and address the question of autochthony of populations in the river. Based on a sequencing of the 334 bp fragment at the 5' end of the mtDNA control region, two haplotypes were identified. Although Gacka River is a part of the Adriatic drainage, 4 individuals (45 %) were assigned to Atlantic haplotype Ad1 and 5 individuals (55 %) were assigned to Danubian haplotype Da2. The presence of Atlantic and Danubian haplotypes primarily reflects introgressioon stemming from the stocking of hatchery-reared fish, although natural status could not be excluded. These results are of great importance for future adequate management and conservation of natural brown trout populations in this region.

brown trout; phylogenetic lineages; Gacka River

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