Outcrossing breeding system does not compromise invasiveness in Buddleja davidii |
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Authors: | Susan K Ebeling Susanne Schreiter Isabell Hensen Walter Durka Harald Auge |
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Institution: | 1. UFZ, Helmholtz Centre for Environmental Research (UFZ), Department of Community Ecology, Theodor-Lieser-Str. 4, 06120 Halle, Germany;2. Institute of Biology/Geobotany and Botanical Garden, Martin-Luther-University Halle-Wittenberg, Am Kirchtor 1, 06108 Halle, Germany |
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Abstract: | Introductions of alien plant species are often likely to consist of a few individuals. Thus, invasion success may strongly depend on their reproductive biology. A high number of self-compatible plants species are known to be successful colonizers of new habitats, even able to establish populations from single propagules. However, many other invasive species require pollen vectors. Here, we investigated the mating system of Buddleja davidii, a fast growing shrub native to China that colonizes quickly in disturbed habitats such as quarries, river banks, along railways and roads, both in its native and invasive regions. It was intentionally introduced to Europe as an ornamental plant because of its fragrant and showy flowers. We additionally studied its vulnerability to biparental inbreeding depression by performing a controlled crossing experiment using pollen from the same population or from geographically close and distant populations, respectively. As a measure for pollination success, we used capsule weight, seed number per capsule and seed weight for each treatment. |
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Keywords: | Mating system Biological invasion Pollination Biparental inbreeding depression |
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