Diatom Assemblages in the Surface Sediments of Lake Shiji and Lake Nakaumi, Shimane Prefecture, Japan.
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概要
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This study examined the diatom assemblages in the surface sediments of two brackish lagoons, Lake Shinji and Lake Nakaumi. The results of this paper are summerized, as follows.<BR>(1) There are distinct difference in composition of diatom assemblages between the two lakes. In Lake Shinji, <I>Cyclotella caspia</I> is dominant, and share s more than 80%. On the contrary, in Lake Nakaumi <I>Cyclotella caspia, Thalas s ionema nitzschioides, Thalassiosira</I> spp. and <I>Fragilaria flavovirens</I> appear together. Paralia sulcata, one of typical diatom species, which commonl y appears in inner bays and brackish lagoons, occurs very rarely only in Lake Nakaumi.<BR>(2) <I>Skeletonema costatum</I> and <I>Chaetoceros</I> sp., which are dominant species in the living planktonic diatom floras of these lakes (AKiyAmA1,976-1985; Date,1976-1985), are not found in sediments. The diatom valves of those species are broken easily soon after their death and hardly deposit in lake floors.<BR>(3) Most of fresh water diatoms which are brought into lakes by rivers are deposited within 2km apart from mouths of rivers. However some species (for example, <I>Synedra ulna</I>) are sometimes brought far from mouths of rivers.
- The Japanese Society of Diatomologyの論文
The Japanese Society of Diatomology | 論文
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