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

van Kleunen, Mark; Meier, Anna; Saxenhofer, Moritz; Fischer, Markus

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

Dateien

van Kleunen.pdfGröße: 8.15 MBDownloads: 656

Datum

2008

Autor:innen

van Kleunen, Mark

Meier, Anna

Saxenhofer, Moritz

Fischer, Markus

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of Plant Ecology. 2008, 1(3), pp. 173-178. ISSN 1752-9921. Available under: doi: 10.1093/jpe/rtn017

Zusammenfassung

Aims: Floral traits are frequently used in traditional plant systematics because
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
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
their pollinators is likely to be more important for specialized pollination
systems as found in many species with bilaterally symmetric (zygomorphic) flowers than for species with radially symmetric (actinomorphic)
flowers. Methods: In a comparative study of 15 zygomorphic and 13 actinomorphic
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
in flower length and width. Within-individual variation in flower and
leaf sizes did not differ significantly between zygomorphic and actinomorphic
species. In line with the predictions of the PMSS, among-individual variation in flower length and flower width was
significantly smaller for zygomorphic species than for actinomorphic
species, while the two groups did not differ in leaf length variation.
This suggests that plants with zygomorphic flowers have undergone
stronger selection for uniform flowers than plants with actinomorphic
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.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

actinomorphy, flower size, floral symmetry, phenotypic variance, zygomorphy

Zitieren

ISO 690

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. 2008, 1(3), pp. 173-178. ISSN 1752-9921. Available under: doi: 10.1093/jpe/rtn017

BibTex

@article{vanKleunen2008Suppo-13313,
  year={2008},
  doi={10.1093/jpe/rtn017},
  title={Support for the predictions of the pollinator-mediated stabilizing selection hypothesis},
  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}
}

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Universitätsbibliographie

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