雑種性帰化タンポポの在来タンポポ生育域への侵入  [in Japanese] Intrusion of Hybridized Alien Dandelions into the Native Dandelion's Habitats  [in Japanese]

交雑による無融合生殖種の分布拡大の実例を探索する目的で, 大阪府堺市泉北ニュータウン泉ヶ丘地区で, 在来黄花タンポポ(ニホンタンポポ), 非雑種性の帰化タンポポ(セイヨウタンポポまたはアカミタンポポ), および在来黄花タンポポの遺伝子を取り込んだ雑種性帰化タンポポの分布を調査した。非雑種性の帰化タンポポは地区の中心部だけに生育していたが, 在来黄花タンポポと雑種性帰化タンポポは全域に分布しており, 雑種性帰化タンポポが非雑種性の帰化タンポポの生育域を越えて, 在来黄花タンポポ生育域まで分布を拡大している状況が明らかになった。

Distributions of the three groups of dandelions, i.e. native yellow-flowered dandelions (Taraxacum platycarpum s. 1.), non-hybridized alien dandelions (true T. officinale and T. laevigatum), and hybrids between native and alien dandelions, were studied in Izumigaoka area of Senboku New Town, Sakai, Osaka Prefecture. The native dandelions were widespread in the investigated area. The non-hybridized alien dandelions were restricted to the central and most disturbed parts of the area. The hybrids, which were morphologically similar to the non-hybridized alien dandelions, were similar to the native dandelions in the pattern of distribution.