多摩川の流下藻(予報1)
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概要
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Investigation of living distribution of drift algae of the Tama River was made from the upper stream (before Nippara River joint) to the lower stream (Daishi Bridge) at eighteen locations of main stream and twelve locations of branch streams on December 11 and 12, 1982. The number of cells per 1 ml of river water varied, in the case of main stream, from 3 to 492, and the average value being 139. The current values were the smallest of all the previous studies of similar nature. The recorded value saddenly increased from station no. 7, Nagata Bridge, as it recorded the maximum at station no. 12, Tama Ohashi Bridge. It then gradually decreased as the minimum recording was found at Futago Bridge. At branch rivers, the value ranged between 1 and 164, which was smaller than the recordings in the past. Widely distributed as dominant specis were Navicula gregaria, Nitzschia frustulum var. perpusilla, and Nitz. palea. Including other species which were widely distributed were those with storongly endurable. Diversity index developed by Shannon and the rate of pureness by Motoda resulted in nagative correlation coefficient, while the latter value was larger on the upper stream than Nagata Bridge and was smaller on the lower stream. The Beck's biotic indicator recorded smaller values in the upper stream than station no. 7, Nagata Bridge and larger values in the lower stream than that, then the maximum at station no. 11, Haijima Bridge. As far as the degree of cleanliness is concerned, lower stream than Tama Suido Bridge recorded zero all the time. Lower stream area branch rivers mostly recorded zero, also, except at the Akigawa and the Hirai larger values were found. Polution rate, index of pollution and saprobic index were similar each other among the recordings. More specificly, these showed smaller values up until station no. 7, Nagata Bridge, at which point it increased suddenly. After that, the recordings varied each other as the stream goes down until the maximum value was recorded at station no. 27, Maruko Bridge. These values were small in branch rivers of those which join the main stream above the Akigawa. It was rather large in the branch rivers of those which join the main stream below the Yachi River.
- 東京女子体育大学・東京女子体育短期大学の論文
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