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Title of Journal: Conserv Genet

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Abbravation: Conservation Genetics

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Kluwer Academic Publishers

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DOI

10.1002/hed.2890070311

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ISSN

1572-9737

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Contrasting Levels of Variation in Neutral and Qua

Authors: Theresa Knopp José M Cano PierreAndré Crochet Juha Merilä
Publish Date: 2006/06/03
Volume: 8, Issue: 1, Pages: 45-56
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Abstract

Reduced levels of genetic variability and a prominent differentiation in both neutral marker genes and phenotypic traits are typical for many island populations as compared to their mainland conspecifics However whether genetic diversity in neutral marker genes reflects genetic variability in quantitative traits and thus their evolutionary potential remains typically unclear Moreover the phenotypic differentiation on islands could be attributable to phenotypic plasticity selection or drift something which seldom has been tested Using eight polymorphic microsatellite loci and quantitative genetic breeding experiments we conducted a detailed comparison on genetic variability and differentiation between Nordic islands viz Gotland Öland and Læsø and neighbouring mainland populations of moor frogs Rana arvalis As expected the neutral variation was generally lower in island than in mainland populations But as opposed to this higher levels of additive genetic variation V A in body size and tibia length were found on the island of Gotland as compared to the mainland population When comparing the differentiation seen in neutral marker genes F ST with the differentiation in genes coding quantitative traits Q ST two different evolutionary scenarios were found while selection might explain a smaller size of moor frogs on Gotland the differentiation seen in tibia length could be explained by genetic drift These results highlight the limited utility of microsatellite loci alone in inferring the causes behind an observed phenotypic differentiation or in predicting the amount of genetic variation in ecologically important quantitative traitsWe would like to thank Kåre Fog Inga Zeisset Markus Johansson David Lesbarrères Katja Räsänen Mattias Sterner and Fredrik Söderman for help in obtaining the samples Our research was supported by the Swedish Natural Science Research Council JM the Academy of Finland TK JM the Antti and Jenny Wihuri Foundation TK Oskar Öflunds stiftelse TK Otto A Malms donationsfond TK and the Spanish Ministry of Education JMC

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