Abstract
This article deals with the community structure of plankton in the Nishina Three Lakes on 68 August 1974. Cyclotella comta and Asterionella gracillima are found dominantly in all the three lakes. In addition to those two species, Fragilaria crotonensis is found abundantly in Lake Nakatsuna, and together with the above three species Attheya zachariasi, Asterionella formosa and Pediastrum duplex var. gracillimum occur in Lake Kizaki. Holopedium gibberum is the dominant species of zooplankton in Lake Aoki, while Polyarthra trigla and Bosminopsis deitersi abound in Lake Nakatsuna and Lake Kizaki. Kellicottia longispina is found abundantly in the deeper layer of Lake Nakatsuna. There are some difference in the plankton fauna between the present report and the result obtained in the summer 1925 in Lake Nakatsuna. Concerning the plankton fauna in Lake Aoki and Lake Kizaki, the present results show the decrease of the number of species and the change of dominant species as compared with those in the summer 1927. In regard to the feature of plankton fauna and flora as well as the vertical distribution of dissolved oxygen content, it may be inferable that Lake Aoki is oligotrophic, Lake Nakatsuna eutrophic, and Lake Kizaki is mesotrophic.
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Schedule a callMore From: Japanese Journal of Limnology (Rikusuigaku Zasshi)
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