Fundamental research for prevention of escape on unjudgment invasive aquatic weeds.

入侵水草群落生长密集，对国民生活造成了危害。本研究的目的是获取信息进行控制，防止损害。在高营养物浓度条件下，伞形螺旋藻和轮状螺旋藻的繁殖与特定外来入侵种毛茛螺旋藻的繁殖相当。然而，匍匐茎在干燥条件下在夏季一天内死亡。毛茛种子成熟期不同，休眠期也不同。“Lagarosiphon major”在逐渐流动和泥浆堆积的底部形成了密集的群落。

The invasive aquatic weeds grow dense community and it is caused damage at the national life. Purposes of this research obtains the information for control, and prevent damage more than now. The reproduction of H. umbellata and H. verticillata was equal the reproduction of specific invasive alien species "H. ranunculoides" under high nutrient concentration. However, creeping stems died under drying condition during a day on summer. The dormancy of H. ranunculoides seeds was different according to maturity."Lagarosiphon major" formed the dense community at the place where gradual flow and mud piled bottom.