諏訪湖におけるノロ(Leptodora kindtii)の現存量

概要

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The seasonal changes in the individual number and the biomass of Leptodora kindtii were measured in Lake Suwa, which was one of the most eutrophicated lakes in Japan. The maximum values of the standing crops were obtained on June, and the individual number and the biomass were 2,710 ind. /m3 and 13.6 mg/ m3, respectively. Based on the maximum value, the standing crop of L. kindtii was calculated about 70 mg dry wt. /m2. The relation between the body length and dry weight of L. kindtii was shown as the following equation: log W = logL-0.093 / 0.473 where W is the dry weight (mg) and L is the body length (mm) of L. kindtii. In Lake Suwa the proportion of L. kindtii among the total zooplankton were 0.012-0.28 % as individual number and were 0.12-0.84 % as biomass.
信州大学理学部の論文