Effective range of reproductive interference exerted by an alien dandelion, <Emphasis Type="Italic">Taraxacum officinale</Emphasis>, on a native congener |
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Authors: | Koh-Ichi Takakura Takashi Matsumoto Takayoshi Nishida Sachiko Nishida |
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Institution: | (1) Osaka City Institute of Public Health and Environmental Sciences, 8-34 Tojo-cho, Tennoji-ku, Osaka 543-0026, Japan;(2) Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu-cho, Sakyo, Kyoto 606-5801, Japan;(3) Present address: Center for Ecological Research, Kyoto University, 2-509-3 Hirano, Otsu 520-2113, Japan;(4) Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo, Kyoto 606-8502, Japan;(5) The Nagoya University Museum, Furoh-cho, Chikusa, Nagoya 464-8601, Japan |
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Abstract: | Reproductive interference (RI), defined as the fitness cost of interspecific sexual interactions, such as interspecific pollen
transfer (IPT) in plants, is ecologically important. Theoretically, RI could result in competitive exclusion, as it operates
in a frequency-dependent manner. Additionally, IPT may have a greater range than resource competition, although information
about the range of IPT is lacking. In the present study, we measured the range of IPT exerted by Taraxacum officinale (an alien species) on a native dandelion, T. japonicum. We used two approaches. In one, we analyzed the RI effect on a native seed set at three spatial scales. In the second, we
tracked IPT from alien to native flower heads using fluorescent pigments as markers. We estimated that pollination distances
were in the order of several meters. These distances exceeded the mean distance from each native plant to the nearest alien.
As hypothesized, the effect of RI reached farther than neighboring individuals. These data indicate the spatial range from
which alien dandelions should be removed to allow the conservation of natives. |
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