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• W2069291267 endingPage "1188" @default.
• W2069291267 startingPage "1170" @default.
• W2069291267 abstract "There is growing interest in quantifying genetic population structure across the geographical ranges of species to understand why species might exhibit stable range limits and to assess the conservation value of peripheral populations. However, many assertions regarding peripheral populations rest on the long-standing but poorly tested supposition that peripheral populations exhibit low genetic diversity and greater genetic differentiation as a consequence of smaller effective population size and greater geographical isolation relative to geographically central populations. We reviewed 134 studies representing 115 species that tested for declines in within-population genetic diversity and/or increases in among-population differentiation towards range margins using nuclear molecular genetic markers. On average, 64.2% of studies detected the expected decline in diversity, 70.2% of those that tested for it showed increased differentiation and there was a positive association between these trends. In most cases, however, the difference in genetic diversity between central and peripheral population was not large. Although these results were consistent across plants and animals, strong taxonomic and biogeographical biases in the available studies call for a cautious generalization of these results. Despite the large number of studies testing these simple predictions, very few attempted to test possible mechanisms causing reduced peripheral diversity or increased differentiation. Almost no study incorporated a phylogeographical framework to evaluate historical influences on contemporary genetic patterns. Finally, there has been little effort to test whether these geographical trends in putatively neutral variation at marker loci are reflected by quantitative genetic trait variation, which is likely to influence the adaptive potential of populations across the geographical range." @default.
• W2069291267 created "2016-06-24" @default.
• W2069291267 creator A5011191505 @default.
• W2069291267 creator A5030150615 @default.
• W2069291267 creator A5091023757 @default.
• W2069291267 date "2008-03-01" @default.
• W2069291267 modified "2023-10-17" @default.
• W2069291267 title "Genetic variation across species’ geographical ranges: the central–marginal hypothesis and beyond" @default.
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