| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
Reproductive interference (RI) may reduce fitness of either of the involved species, with potentially important ecological consequences. To testify a hypothesis that RI from alien species causes displacement of native plants, we conducted a comparative study on native dandelion populations that had different distributional relationships with the alien dandelions to examine association between the effect of the alien RI and the degree of displacement of the natives. We also compared different mechanisms of RI in one of the populations to clarify the responsible factor.
We found that RI from the aliens to the natives was strong in regions where the aliens outnumbered the natives and marginal where they did not; this result suggests that alien RI can critically affect distributional relationships between native and alien species. We also found that among the examined mechanisms, heterospecific pollen deposition might have the largest deleterious effect on the native species.
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