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We examined vertical distribution of diatom frustules in a sediment core to relate the monitored water quality data in Lake Tateshina, an agricultural reservoir located in Tateshina hot spring area at Chino City, Nagano Prefecture, Japan. Three hypertrophenic and alkaliphilous species, Stephanodiscus hantzscii, Stephanodiscus minutulus, and Cyclostephanos invisitatus, were dominant in the sediments presumed to be precipitated between 1974 and 1981. This corresponds to the high TN and TP concentration and high pH monitored around those times. Subsequently, Cyclostephanos dubius increased and it became dominant in the surface sediment. This change is possibly explained by rising water temperature. We also inferred the past water quality change before the start of the monitoring. Sediments presumed to be precipitated from 1952 to 1973 were also dominated by S. hantzscii, S. minutulus, and C. invisitatus. This suggests that the lake water was nutrient-rich and alkaline since the construction, probably caused by inflowing wastewater contained hot spring water.

nihon mizushori seibutsu gakkaishi

Vertical Distribution of Sediment Diatoms Related to the Monitored Water Quality, and Inferring the Previous Water Environment in Lake Tateshina in Central Japan