宮城県地方における苗代のイトミミズ類のすみわけ

概要

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1. Observations were made on the aquatic oligochaetes obtained from rice seedling beds at 12 different stations in Miyagi Prefecture during the period from May to June, 1953,with the following results : 2. Five species were distinguished, namely, Limnodrilus gotoi, Branchiura sowerbyi, L. willeyi, L. motomurai, and Tubifex hattai. 3. Three types of habitat segregation of the aquatic oligochaetes were recognized as correlating with the mud conditions. 4. Of the five mentioned species, L. gotoi, B. sowerbyi, and L. willeyi, are dominant. L. gotoi was dominant in most of the stations, therefore, it made on exclusive community of great populations. In some stations, B. sowerbyi is dominant, and some stations are characterized by a dominance of B. sowerbyi and L. willeyi. 5. From the results of observation, it is found that the communities of the aquatic oligochaetes in rice seedling beds consisted chiefly of two communities, one characterized by L. gotoi and the other by B. sowerbyi.
1954-12-25