Abstract
A classification of Japanese lakes was made with special references to the hypolimnetic oxygen and the benthonic fauna in the profundal regions. The following characteristic benthonic animals were selected as the indicator species for classifying lakes : Micropsectra sp. A, Calopsectra sp. J and Spaniotoma sp. B were for stenoxybiontic; Chironomus bathophilus and Sergentia sp. B for mesoxybiontic; Chironomus plumosus and Chaoborus sp. for euroxybiontic. Tubifex sp. was also used as an indicator species of the lakes without chironomid or chaoborid larvae. According to the difference in the dissolved oxygen content in the hypolimnion for the summer stagnation period, oligotrophic, mesotrophic and eutrophic lakes were respectively defined as lakes where hypolimnetic oxygen content was more than 50% in saturation, less than 50% but more than 10%, and less than 10%. Taking the distribution of indicator species into account, fifty lakes in Japan were classified into the 4 types and 14 classes shown in Table 2.
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