Abstract
Like many salmonid species, Arctic charr (Salvelinus alpinus) is currently threatened by human-induced perturbations. From a conservation perspective, it is important to characterize the genetic diversity of populations so that genetically distinct units worthy of conservation effort can be identified. Here, we used microsatellite markers to assess whether a recently discovered Finnish population of lacustrine charr found in Lake Karhunpesalampi is of natural origin. We also aimed to reveal the colonization history of this lake. To this end, we quantified genetic diversity and distance of this population to other charr populations inhabiting Fennoscandia including all sources used in official Finnish stocking programs. The population was found to be genetically differentiated from all other populations analysed. This, together with the remote location of the lake and other population genetic information, indicates that the population is likely of natural origin. The population deserves to be acknowledged as a genetically distinct unit worthy of conservation.
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