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Genetic Diversity and Hybridisation between Native and Introduced Salmonidae Fishes in a Swedish Alpine Lake
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology. Univ Tsukuba, Sugadaira Montane Res Ctr, Sugadaira Kogen 1278-294, Ueda, Nagano 3862204, Japan..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology. Inst Coastal Res, Dept Aquat Resources, Skolvagen 6, S-74242 Oregrund, Sweden..
2016 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, no 3, e0152732Article in journal (Refereed) Published
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Abstract [en]

Understanding the processes underlying diversification can aid in formulating appropriate conservation management plans that help maintain the evolutionary potential of taxa, particularly under human-induced activities and climate change. Here we assessed the microsatellite genetic diversity and structure of three salmonid species, two native (Arctic charr, Salvelinus alpinus and brown trout, Salmo trutta) and one introduced (brook charr, Salvelinus fontinalis), from an alpine lake in sub-arctic Sweden, Lake Ann. The genetic diversity of the three species was similar and sufficiently high from a conservation genetics perspective: corrected total heterozygosity, H'(T) = 0.54, 0.66, 0.60 and allelic richness, A(R) = 4.93, 5.53 and 5.26 for Arctic charr, brown trout and brook charr, respectively. There were indications of elevated inbreeding coefficients in brown trout (G(IS) = 0.144) and brook charr (G(IS) = 0.129) although sibling relationships were likely a confounding factor, as a high proportion of siblings were observed in all species within and among sampling locations. Overall genetic structure differed between species, Fst = 0.01, 0.02 and 0.04 in Arctic charr, brown trout and brook charr respectively, and there was differentiation at only a few specific locations. There was clear evidence of hybridisation between the native Arctic charr and the introduced brook charr, with 6% of individuals being hybrids, all of which were sampled in tributary streams. The ecological and evolutionary consequences of the observed hybridisation are priorities for further research and the conservation of the evolutionary potential of native salmonid species.

Place, publisher, year, edition, pages
2016. Vol. 11, no 3, e0152732
National Category
Biological Sciences
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URN: urn:nbn:se:uu:diva-295565DOI: 10.1371/journal.pone.0152732ISI: 000373121800131PubMedID: 27032100OAI: oai:DiVA.org:uu-295565DiVA: diva2:941295
Funder
Carl Tryggers foundation Swedish Research Council
Available from: 2016-06-22 Created: 2016-06-08 Last updated: 2017-11-28Bibliographically approved

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