关于放逸短沟蜷的生态研究

Ecological Study on the Semisuleospora Libertina

通过野外调查和室内实验，阐述了日本产放逸短沟蜷（Ｓｅｍｉｓｕｌｃｏｓｐｉｒａｌｉｂｒｔｉｎａ）在不同生态环境下体内稚贝保有状况以及稚贝产出时期与水温的关系．结果表明，雌性个体的育儿囊中稚贝含有量夏季和冬季多，春季（４月、５月）和秋季（９月、１０月）急剧减少．

The fresh water snail, semisulcospira libertina was investigated ecologically at 3 stations with different ecological conditions. The female snails with embryo shells in the brood pouch were observed abundantly in summer and winter, where as they decreased abruptly in number in spring(April and May) and autumn(September and October). when the brood pouch contained only a small number of embryos and achieved a vesicular appearance.