Trophic Status of Lake Akimoto and Physicochemical Comparison with Two Sister Lakes of the Same Age
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Abstract : The trophic status of Lake Akimoto, which was formed together with sister Lakes Hibara and Onogawa by the volcanic eruption of Mt.Bandai about 100 years ago, is judged to be on the boundary between oligo- and mesotrophic based on some phisicochemical parameters. This trophic status is similar to that of Lake Hibara, while Lake Onogawa is on the boundary between meso- and eutrophic. The difference in maximum depth (33, 31 and 21 m for Lakes Akimoto, Hibara and Onogawa, respectively) probably caused these trophic differences, which have resulted in some limnological differences among the lakes. Apparent hypolimnetic ammonia regeneration is 6～14 times greater in Lake Onogawa than in Lakes Akimoto and Hibara. Hypolimnetic dissolved oxygen was not exhausted in Lakes Akimoto and Hibara, while an anoxic condition prevailed for two and a half months in Lake Onogawa. Hypolimnetic nitrate was not depleted by nitrate reduction in Lakes Akimoto and Hibara, while it was completely exhausted for three months in Lake Onogawa. Apparent nitrification is indicated from the depth-time diagrams of nitrate in Lakes Akimoto and Hibara, which is not the case in Lake Onogawa. These three lakes are peculiar in that their lake histories are clear, they have the same age and they lie in a similar environment, but their trophic status is different. Thus, these lakes serve as good fields for comparative studies of many aspects of limnology. Key words : dammed lakes, limnological comparison, seasonal changes, sister lakes
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