Abstract
1. Lakes Tyuzenji-ko, Yuno-ko, Suge-numa and Maru-numa were investigated in 1972 and 1973 in regard to their bottom fauna. The results obtained were compared with the data by MIYADI during the years from 1928 to 1930. They are shown in Table 10.2. Lake Tyuzenji-ko : Micropsectra sp. (A), which is a characteristic species of oligotrophic lakes, occurred on the bottom between the littoral and profundal zones. Tubifex sp. is abundant in the profundal zone ; an azoic zone does not exist at present.3. Lake Yuno-ko : Though Tubifex sp. and Chironomus plumosus occurred in the profundal zone where oxygen was absent in summer stagnation period, some of them seemed to move to the shallow bottom. This lake belongs to “eutrophic Plumasus lake” at present.4. Lake Suge-numa : In the main basin Kitamata-numa Micropsectra sp. (A), Spaniatoma sp. (B-5) and Tubifex sp., though not abundant, were found in the profundal zone. This lake belongs to “oligotrophic Tanytarsus lake” as it was so at the time of MIYADI's investigation. As for the auxiliary basin Shimizu-numa there was found an azoic zone existing partly in the profundal zone. Some kinds of chironomid larvae occurred in the littoral zone.5. Lake Maru-numa : Chironomus plumosus larvae are abundant on the shallow bottom. Tubifex sp. is distributed widely in the profundal zone.
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