A1 Refereed original research article in a scientific journal
High level of population genetic structuring in lake-run brown trout, Salmo trutta, of the Inari Basin, northern Finland
Authors: Swatdipong A, Vasemagi A, Niva T, Koljonen ML, Primmer CR
Publisher: WILEY-BLACKWELL
Publication year: 2010
Journal: Journal of Fish Biology
Journal name in source: JOURNAL OF FISH BIOLOGY
Journal acronym: J FISH BIOL
Number in series: 9
Volume: 77
Issue: 9
First page : 2048
Last page: 2071
Number of pages: 24
ISSN: 0022-1112
DOI: https://doi.org/10.1111/j.1095-8649.2010.02784.x
Abstract
Rivers draining into (Lake) Inarijarvi, northern Finland, sustain a number of lake-run brown trout, Salmo trutta, populations but, as with most lake-run S. trutta systems, the level of population genetic structuring among populations is unknown. To address this and to assist fish stock management in the region, the population genetic structure of S. trutta collected from 28 sampling sites in rivers flowing into Inarijarvi was studied using 13 microsatellite loci. Populations were clustered into three separate groups, largely corresponding to geographic regions, with between-region F-ST values ranging from 0 center dot 11 to 0 center dot 16. The significant differentiation observed between most populations within each region also implies that individual populations should be recognized as separate management units and actions to improve, and subsequently maintain, conditions for natural spawning should be prioritized. The results of this study further indicate that the trout from each of these regions may have different biological characteristics, such as local-lake feeding behaviour among the western populations and strong isolation among the northern stocks. As a consequence, further research is warranted to better understand the level of ecological uniqueness of lake-run S. trutta populations.
Rivers draining into (Lake) Inarijarvi, northern Finland, sustain a number of lake-run brown trout, Salmo trutta, populations but, as with most lake-run S. trutta systems, the level of population genetic structuring among populations is unknown. To address this and to assist fish stock management in the region, the population genetic structure of S. trutta collected from 28 sampling sites in rivers flowing into Inarijarvi was studied using 13 microsatellite loci. Populations were clustered into three separate groups, largely corresponding to geographic regions, with between-region F-ST values ranging from 0 center dot 11 to 0 center dot 16. The significant differentiation observed between most populations within each region also implies that individual populations should be recognized as separate management units and actions to improve, and subsequently maintain, conditions for natural spawning should be prioritized. The results of this study further indicate that the trout from each of these regions may have different biological characteristics, such as local-lake feeding behaviour among the western populations and strong isolation among the northern stocks. As a consequence, further research is warranted to better understand the level of ecological uniqueness of lake-run S. trutta populations.
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