Abstract
The purpose of this study is to analyze effects of aquatic plants on inhabitants of aquatic insects in an irrigation pond. An investigation of collecting aquatic insects and surveying environmental factors such as population densities of aquatic plants and conditions of sedimentation were implemented at nine plots. A cluster analysis to find out similarities and differences of environmental characteristics and inhabitants of aquatic insects among these plots showed; 1) the plots that had rich vegetation of Leersia japonica were classified as a proper habitat for Odonata larvae, 2) the plots that had vegetation of submerged plant or floating-leaved plants were also classified as a proper habitat for Odonata larvae, 3) the plots that had rich vegetation of Scirpus triangulates were classified as a proper habitat for Coleoptera adult, 4) sedimentation from withered aquatic plants was effective in proper habitant for several species of Odonata larvae.
