FIELD OBSERVATIONS ON VERTICAL DISTRIBUTION OF MARINE ORGANISMS IN MAN-MADE ROCKY COAST

The purpose of this study is to establish the construction technique of the man-made rocky coast aiming at coexistence with marine organisms. From such viewpoint, the field observations on marine organisms and their life environment were carried out in the seven man-made rocky coasts and natural one at Osaka Bay and Tohban Coast.The result showed that there were most small marine organisms species of the man -made rocky coast in the bay inner part and that it is abounding as a marine organisms species of the man -made rocky coast of the place which separated from the bay inner part. The diversity and prosperity of marine organism in man -made rocky coast are influenced by the seawater motion due to wave and current. The diversity index and prosperity index of marine organism increase as reflection coefficient of the light and surface temperature of construction material are lower.