Genetic Variability and Structuring of Arctic Charr (Salvelinus alpinus) Populations in Northern Fennoscandia

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Shikano , T , Järvinen , A , Marjamaki , P , Kahilainen , K K & Merilä , J 2015 , ' Genetic Variability and Structuring of Arctic Charr ( Salvelinus alpinus ) Populations in Northern Fennoscandia ' , PLoS One , vol. 10 , no. 10 , 0140344 . https://doi.org/10.1371/journal.pone.0140344

Title: Genetic Variability and Structuring of Arctic Charr (Salvelinus alpinus) Populations in Northern Fennoscandia
Author: Shikano, Takahito; Järvinen, Antero; Marjamaki, Paula; Kahilainen, Kimmo K.; Merilä, Juha
Other contributor: University of Helsinki, Biosciences
University of Helsinki, Kilpisjärvi Biological Station
University of Helsinki, Environmental Sciences
University of Helsinki, Biosciences




Date: 2015-10-15
Language: eng
Number of pages: 17
Belongs to series: PLoS One
ISSN: 1932-6203
DOI: https://doi.org/10.1371/journal.pone.0140344
URI: http://hdl.handle.net/10138/160263
Abstract: Variation in presumably neutral genetic markers can inform us about evolvability, historical effective population sizes and phylogeographic history of contemporary populations. We studied genetic variability in 15 microsatellite loci in six native landlocked Arctic charr (Salvelinus alpinus) populations in northern Fennoscandia, where this species is considered near threatened. We discovered that all populations were genetically highly (mean F-ST approximate to 0.26) differentiated and isolated from each other. Evidence was found for historical, but not for recent population size bottlenecks. Estimates of contemporary effective population size (N-e) ranged from seven to 228 and were significantly correlated with those of historical N-e but not with lake size. A census size (N-C) was estimated to be approximately 300 individuals in a pond (0.14 ha), which exhibited the smallest N-e (i.e. N-e/N-C = 0.02). Genetic variability in this pond and a connected lake is severely reduced, and both genetic and empirical estimates of migration rates indicate a lack of gene flow between them. Hence, albeit currently thriving, some northern Fennoscandian populations appear to be vulnerable to further loss of genetic variability and are likely to have limited capacity to adapt if selection pressures change.
Subject: CROSS-SPECIES AMPLIFICATION
SALMON SALMO-SALAR
MICROSATELLITE LOCI
BROWN TROUT
POSTGLACIAL COLONIZATION
LINKAGE DISEQUILIBRIUM
PHYLOGENETIC TREES
DIVERSITY ANALYSIS
COMPUTER-PROGRAM
FREQUENCY DATA
1181 Ecology, evolutionary biology
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