A Preliminary Study on the Guideline for Open Space Planning around Bodies of Water Based on the Variation of Odonata Species

Abstract

This is a comparative study on the dragonfly habitat found in several ponds for the purpose of selecting species applicable to the ecological guideline for open space planning. The study was conducted based on the stndard habitat environment of Okegayanuma pond in Shizuoka Prefecture. It revealed that four widely distributed species of the dragonfly will represent each stage of environmental restoration of the open space. In particular on the third stage, the species of Choutonbo (Rhythemis fuliginosa) increases its population density in response to a variety of environmental structure in the open spase around the body of water. Also it was indicated that Choutonbo would dominate the entire dragonfly population in summertime under an ecologically optimum conditions of the environment.