Abstract
The impact of directional selection on specific trait types in plant species, and how a species’ life history mediates this response to selection remains understudied. Discovering such interactions is however crucial for understanding the interplay between ecological and genetic processes underlying local adaptation in plants, and to evaluate a species’ evolutionary potential with respect to changing environments. Furthermore, it remains unclear whether the degree of adaptive differentiation generally increases with the geographical distance between plant populations. Here, we present a weighted mixed model based meta-analysis aimed at unraveling the potential interactions between plant trait types, life history characteristics and QST–FST comparisons, and assessing the effect of geographical scale on population differentiation. Based on 51 studies we found that QST values exceeded their corresponding FST values in 71.74 % out of 401 cases. Furthermore, different trait types were found to be differently susceptible to natural selection and the magnitude of QST–FST comparisons was mediated by a plant species’ life span. These findings may be closely related to the genetic architectures of trait types and life histories, with the proportion of large-effect genes likely shaping the response to natural selection. QST–FST values also increased with increasing distance between populations, pinpointing the combined effects of environmental differentiation and isolation by distance on the magnitude of population divergence. Finally, our model showed an inverse relationship between FST and QST–FST values, presumably resulting from isolation by distance, the exchange of advantageous alleles, or genetic correlations among traits.
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Acknowledgments
We would like to thank Tuomas Leinonen for providing us raw QST and FST data from the years 2007 and earlier. We appreciate the contributions from Jill Anderson, Mounawer Badri, Zdravko Baruch, Katrina Dlugosch, Met Gandour, Santiago C. González-Martínez, David Hall, Martin Lascoux, Sébastien Lavergne, Andrea Plüss, J.F. (Niek) Scheepens, Dorothy Steane, Jon Hollander, Johan Kroon and Yvonne Willi for providing additional data. We also thank Guy Vranckx and three anonymous referees for valuable comments.
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De Kort, H., Vandepitte, K. & Honnay, O. A meta-analysis of the effects of plant traits and geographical scale on the magnitude of adaptive differentiation as measured by the difference between QST and FST . Evol Ecol 27, 1081–1097 (2013). https://doi.org/10.1007/s10682-012-9624-9
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DOI: https://doi.org/10.1007/s10682-012-9624-9