PLANKTON AND ITS VERTICAL DISTRIBUTION OF LAKE SUIGETSU IN SUMMER

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  • 水月湖における夏季プランクトンとその垂直分布
  • 水日湖における夏季プランクトンとその垂直分布
  • スイビコ ニ オケル カキ プランクトン ト ソノ スイチョク ブンプ

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Abstract

The plankton and its vertical distribution in Lake Suigetsu was studied in early July of 1966. The results are as follows : 1. Seventeen species of phytoplankton and eight species of zooplankton were found in this lake, the abundant species being Chaetoceros Muelleri, Melosira granulata (Diatom), Sinocalanus tenellus (Copepoda) and Diaphanosoma brachyurum (Cladocera). 2. Comparing the present data with the data of the summer plankton studied by KIKUCHI (1927,1931) and KOKUBO (1944), both the species number and individual number of the brackish species in the present study are larger than those noted by KIKUCHI and KOKUBO. 3. Almost all phytoplankton are distributed in the upper layer in this lake, but Cyclotella glomerata occurs in the deeper water layer of 6 to 9 meters (Fig. 3). 4. Chromatium Weisei (Triobacteria) and ciliata occur in the water layer of 9 to 9.5 meters deep, where the oxygen content is low and hydrogen sulfide is present. 5. Zooplankton occurs from surface to the layer of 9 meters deep. Among them, Sinocalanus tenellus, Paracyclopina nana and Pseudodiaptomus inopinus, all being brackish water species, distribute at different depths (Fig. 4). 6. Many pieces of thoracic legs of Diaphanosoma brachyurum were found in the water layer of 6 to 9 meters deep (Fig. 5).

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