八ヶ岳白駒池におけるミズダニ(Piona carnea)の生活史

概要

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Life history of a water mite (Piona carnea) was studied in a mountain humic lake (Lake Shirakomaike) in Nagano prefecture from May in 1999 to February in 2000. P.carnea appeared in plankton assemblage from late May to late October. Females having eggs were observed between late May and late July. They attached their eggs on aquatic plants in the west coast of the lake from late June to late July. In the coastal area, the first larval stage (larvae) appeared fromearly July to early August, and parasitized the 2nd and 3rd-year larvae of Odonata. The second larval stage (nymphs) was observed in a plankton assemblage from early July to mid September. In mid September the second pupae were observed on aquatic plants in the west coast. New recruitments of adults appeared in late September. P.carnea disappeared fromplankton assemblage until the end of October, and accumulated in the lake bottom from November to probably April. A dense population was found on 18 November (267 individuals m^-2) and on 7 February (281 individuals m^-2) in the bottom at the lake center. P.carnea completes its life history each year in Lake Shirakomaike.
信州大学の論文