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Temporal changes in genetic diversity of isolated populations of perch and roach

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Abstract

Genetic drift, together with natural selection and gene flow, affects genetic variation and is the major source of changes in allele frequencies in small and isolated populations. Temporal shifts in allele frequencies at five polymorphic loci were used to estimate the amount of genetic drift in an isolated population of perch (Perca fluviatilis L.) and roach (Rutilus rutilus L.). Here, I used the populations from the Biotest basin at Forsmark, Sweden, to investigate genetic diversity between 1977 and 2000, during which time the population can be considered to be totally isolated from other populations. Microsatellite data reveal stable levels of gene diversity over time for both species. Estimates of genetic differentiation (F ST) showed a significant divergence between 1977 and 2000 for both perch and roach. A positive correlation between genetic distance and time was found (Mantel test, perch: r = 0.724, P = 0.0112; roach: r = 0.59, P = 0.036). Estimates of effective population size (N e) differed with a factor six between two different estimators (NeEstimator and TempoFS) applying the temporal method. Ratios of N e/N ranged between 10−2 and 10−3, values normally found in marine species. Despite low N e the populations have not lost their evolutionary potential due to drift. But two decades of isolation have lead to isolation by time for populations of perch and roach, respectively.

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Acknowledgments

I thank Stefan Palm, Sara Bergek, Mats Björklund, Amber Rice, and two anonymous reviewers for providing valuable comments on a previous version of the manuscript. I thank the Swedish Board of Fisheries for providing the samples. Thanks to Peter Karås for giving valuable information about the Biotest basin and Anders Adill for compiling species abundance data.

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  1. Department of Animal Ecology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, 752 36, Uppsala, Sweden

    Marnie H. Demandt

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  1. Marnie H. Demandt
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Correspondence to Marnie H. Demandt.

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Demandt, M.H. Temporal changes in genetic diversity of isolated populations of perch and roach. Conserv Genet 11, 249–255 (2010). https://doi.org/10.1007/s10592-009-0027-6

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