再生氾濫原におけるドブガイ属の生態と侵入システムに関する事例研究

摘要

Anodonta sp.or spp. (Bivalvia : Unionidae) was found in a restored floodplain (Azamenose area) by a preliminary survey. Anodonta spp. have been decreasing in numbers and also losing their habitats. It is, therefore, necessary for us to establish or develop a skill to preserve and restore their habitats. In this study, forcusing attention on Anodonta living in Azamenose area, we aimed investigate their distribution, estimated the age of individuals and discuss the transportation mechanism of Anodonta. We found a significant positive relationship between shell length of Anodonta and physical conditions (water depth, mud depth). We suggest that Anodonta were probably transported by flood water to Azamenose area, explaining estimated age and seasonal change of the recruitment pattern.