Inhibition Effects of Suspended and Accumulated Particles on Adhesion and Development of Undaria Pinnatifida Zoospores.

Abstract

Effects of suspended and accumulated kaolinite particles on the adhesion and the development of Undaria pinnatifida zoospores on the substratum were investigated under the following three types of condition; Case-1: suspended particles together with zoospores, Case-2: zoospores released after accumulation of particles on the substratum, and Case-3 : accumulated particles on zoospores adhered on the substratum.Case-2 was the most effective inhibition for the adhesion of zoospores, and 50% of effective concentration of particles (EC50) was 29 μg·cm-2. It was difficult for gametophytes to develop to sporophytes in Case-3. Furthermore, in comparing Undaria zoospores with Porphyra conchospores, the zoospores showed higher tolerance to suspended particles.