Testing for ecological and genetic allee effects in the invasive shrub Senna didymobotrya (Fabaceae)

van Kleunen, Mark; Johnson, Steven D.

Testing for ecological and genetic allee effects in the invasive shrub Senna didymobotrya (Fabaceae)

Dateien

van Kleunen.pdfGröße: 530.99 KBDownloads: 257

Datum

2005

Autor:innen

van Kleunen, Mark

Johnson, Steven D.

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

American Journal of Botany. 2005, 92(7), pp. 1124-1130. ISSN 0002-9122. Available under: doi: 10.3732/ajb.92.7.1124

Zusammenfassung

For an introduced plant species to become invasive, it must be able to reproduce even in initially small populations. We tested for Allee effects (reduced reproductive performance of individuals in small populations) in the nonclonal, buzz-pollinated shrub Senna didymobotrya in its invasive range in South Africa. The species is self-compatible, but we found that in its invasive range in South Africa it requires pollinators to set seed. Nearly all stigmas (90%) received pollen, but natural fruit set was very low (3–20%). Pollen receipt and fruit set were not significantly correlated with population size. We thus found no evidence for an ecological Allee effect arising from pollen limitation in small populations. Offspring seedling performance, measured in terms of stem volume and leaf area, was also not significantly correlated with the number of plants in the source population, indicating that genetic Allee effects, such as inbreeding depression, are either absent or of such a small magnitude that they would be unlikely to limit further spread of S. didymobotrya in South Africa.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

alien plant, Baker’s rule, Cassia didymobotrya, nonindigenous plant, pollination, population size, Xylocopa spp.

Zitieren

ISO 690

VAN KLEUNEN, Mark, Steven D. JOHNSON, 2005. Testing for ecological and genetic allee effects in the invasive shrub Senna didymobotrya (Fabaceae). In: American Journal of Botany. 2005, 92(7), pp. 1124-1130. ISSN 0002-9122. Available under: doi: 10.3732/ajb.92.7.1124

BibTex

@article{vanKleunen2005-07Testi-13349,
  year={2005},
  doi={10.3732/ajb.92.7.1124},
  title={Testing for ecological and genetic allee effects in the invasive shrub Senna didymobotrya (Fabaceae)},
  number={7},
  volume={92},
  issn={0002-9122},
  journal={American Journal of Botany},
  pages={1124--1130},
  author={van Kleunen, Mark and Johnson, Steven D.}
}

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