: The species diversity and population of dragonfly larvae are spatially different. In this study, we did mesocosm experiments to examine the effect of litter supply on the dragonfly larvae community. Size and species composition of dragonfly larvae and presence / absence of chironomid, a food resource for dragonfly larvae, were also controlled in the experiment. The results indicated that the litter provide the hiding places for small larvae, and consequently extend the survival time of them.Therefore, the litter supply regulates the structure of the dragonfly larva community.
Species composition of aquatic insect in the swimming pool of 32 schools in Tokyo and Chiba prefectures was studied from 2007 to 2008. As a result of TWINSPAN analysis, stands were primarily classified into 2 groups as Tokyo and Chiba. Rhantus pulverosus, Hydaticus grammicus, Ranatra chinensis, and Crocothemis servilia mariannae were not observed at the swimming pools in Tokyo. Major environmental factors of species composition were considered to be the ratio of paddy field in the district and the presence of trees around the pool. The amount of fallen leaves in the pools affected the species population of aquatic insects.
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