谷津干潟におけるアオサの繁茂特性に関する現地調査

抄録

Yatsu Higata is one of the most significant remaining tidal flats in Japan, and was registered under the Ramsar Convention in 1993. In recent years, Yatsu Higata has witnessed an extraordinary growth of Ulva sp. algae. This paper describes field studies intended to explore the dynamics of the nutrient in Yatsu Higata and Tokyo Bay. As a result, the Ulva sp. flourishes in Yatsu Higata, due to the ready supply of nutrient runoff supplied by the Yatsu River. In the water quality of Yatsu Higata, nitrate nitrogen is high and to be considered to strongly affect the growth of Ulva sp.. The ability of purification of Yatsu Higata reduces in summer and winter because of the existence of Ulva sp..