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Support for the predictions of the pollinator-mediated stabilizing selection hypothesis

Support for the predictions of the pollinator-mediated stabilizing selection hypothesis

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VAN KLEUNEN, Mark, Anna MEIER, Moritz SAXENHOFER, Markus FISCHER, 2008. Support for the predictions of the pollinator-mediated stabilizing selection hypothesis. In: Journal of Plant Ecology. 1(3), pp. 173-178. ISSN 1752-9921

@article{van Kleunen2008Suppo-13313, title={Support for the predictions of the pollinator-mediated stabilizing selection hypothesis}, year={2008}, doi={10.1093/jpe/rtn017}, number={3}, volume={1}, issn={1752-9921}, journal={Journal of Plant Ecology}, pages={173--178}, author={van Kleunen, Mark and Meier, Anna and Saxenhofer, Moritz and Fischer, Markus} }

Meier, Anna Meier, Anna Aims: Floral traits are frequently used in traditional plant systematics because<br />of their assumed constancy. One potential reason for the apparent constancy of flower size is that effective pollen transfer between flowers depends on the accuracy of the physical fit between<br />the flower and pollinator. Therefore, flowers are likely to be under stronger stabilizing selection for uniform size than vegetative plant parts. Moreover, as predicted by the pollinator-mediated stabilizing selection (PMSS) hypothesis, an accurate fit between flowers and<br />their pollinators is likely to be more important for specialized pollination<br />systems as found in many species with bilaterally symmetric (zygomorphic) flowers than for species with radially symmetric (actinomorphic)<br />flowers. Methods: In a comparative study of 15 zygomorphic and 13 actinomorphic<br />species in Switzerland, we tested whether variation in flower size, among and within individuals, is smaller than variation in leaf size and whether variation in flower size is smaller in zygomorphic compared to actinomorphic species. Important findings: Indeed, variation in leaf length was significantly larger than variation<br />in flower length and width. Within-individual variation in flower and<br />leaf sizes did not differ significantly between zygomorphic and actinomorphic<br />species. In line with the predictions of the PMSS, among-individual variation in flower length and flower width was<br />significantly smaller for zygomorphic species than for actinomorphic<br />species, while the two groups did not differ in leaf length variation.<br />This suggests that plants with zygomorphic flowers have undergone<br />stronger selection for uniform flowers than plants with actinomorphic<br />flowers. This supports that the relative uniformity of flowers compared to vegetative structures within species, as already observed in traditional plant systematics, is, at least in part, a consequence of the requirement for effective pollination. Fischer, Markus 2008 van Kleunen, Mark First publ. in: Journal of Plant Ecology 1 (2008), 3, pp. 173-178 van Kleunen, Mark 2011-06-28T12:10:51Z 2011-06-28T12:10:51Z deposit-license eng Fischer, Markus Support for the predictions of the pollinator-mediated stabilizing selection hypothesis Saxenhofer, Moritz Saxenhofer, Moritz

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