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Maintenance of a small anadromous subpopulation of brown trout (Salmo trutta L.) by straying

, : Maintenance of a small anadromous subpopulation of brown trout (Salmo trutta L.) by straying. Freshwater Biology 51(2): 351-358

1. Microsatellite and isozyme loci variation were used to study structure and dynamics of a brown trout (Salmo trutta) population heavily affected by damming. The downstream area accessible for spawning was drastically reduced to a stream 1 km long influenced by regulated discharge.2. Stocking of hatchery-reared juveniles failed and the population is entirely supported by anadromous adults from neighbouring populations.3. Temporal genetic stability is reported here. Some punctual between-river genetic differences are likely because of different contribution from each neighbouring river through years.4. High anadromy-mediated gene flow produces a lack of genetic substructure in the region. The role of anadromous brown trout on maintenance of endangered small populations is emphasised.


DOI: 10.1111/j.1365-2427.2005.01486.x

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