〓水性水域の底棲生物群集の研究 : III.尾駮沼, 鷹架沼の底棲生物特に群集型の系列について
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概要
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Obuchi-numa and Takahoko-numa are small brackish water lakes situated at the neck of Shimokita Peninsula, Aomori Prefecture (Fig. 1). The benthos of these lakes were collected by means of a modified EKMAN-BIRGE's bottom sampler with an opening of 1/25 sq. meters. Sampling was repeated for six or more times and the benthos in the area of about 1/4 sq. meters were obtained at each station. Individual numbers of each species composing the benthos were counted and represented by the percentage of individual numbers of each species to the total number in each station (Fig. 2). Based upon whether there is overlapping of each two 90 per cent confidence limits of the said percentage in each species, three and four different communities were distinguished in Obuchi-numa and Takahoko-numa respectively. The distribution of these communities in both brackish lakes runs parallel in some degrees with the distribution of chlorinity of bottom water. Here the sectioning of chlorinity correlated with the distribution of the bottom communities corresponds to the one used by REDBKE in his study of evaluation of brackish water lakes in the Netherlands. The bottom communities of the above-mentioned two brackish water lakes and the other two previously studied by the present writer and his associates were arranged according to the chlorinity contents of bottom water. These communities were traced serially by two joint species of two or more communities in different lakes with the result that they seem to form a series with some branches.
- 日本生態学会の論文
- 1954-07-31
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