Invasion Status and Growth Attributes of Naturalized Ryegrasses (Lolium spp.) along the Abe River, Shizuoka Prefecture

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  • 静岡県安倍川におけるライグラス類野生化集団の侵入および生育状況
  • シズオカケン アベガワ ニ オケル ライグラスルイ ヤセイカ シュウダン ノ シンニュウ オヨビ セイイク ジョウキョウ

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Abstract

Non-native pasture plants have been widely sown throughout Japan. However, they have often escaped to the surrounding habitats, forming naturalized populations. Some of these non-native plants have become agricultural or environmental weeds. To properly manage risks caused by the naturalized populations, collecting and compiling data on the invasion status and ecological attributes of the naturalized populations is essential. In this paper, we report the invasion status of ryegrasses in the floodplain of the Abe river (Shizuoka-city). We also measured their growth and reproductive attributes using a 60m transect at local scale. Naturalized populations of Italian ryegrass occurred frequently throughout the lower to middle reaches of the river, but their coverage seems to be low. Italian ryegrass invaded the habitats of the endangered butterfly (Lycaeides argyrognomon praeterinsularis), on four (57.1%) of the seven sites. However, we did not observe any negative effect of ryegrass growth on the butterfly's host plant. The plants which deeply invaded the floodplain generally produced a few tillers and exhibited short statures. Even these plants exhibited moderate seed sets, suggesting that pollen flow may be unexpectedly high in the floodplains with short plants.

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