Abstract
ABSTRACTThe influence of a Sargassum forest on the spatial distribution of water flow generated by waves and tidal currents was investigated. Water flow was measured horizontally and vertically by using plaster balls at a Sargassum forest in Saiki Bay facing the Bungo Channel, on the Pacific Coast of Kyushu Island, Japan, from 7 to 9 March 1989 during the luxuriant growth season of Sargassum species. Plaster balls were deployed at several depths at stations placed with horizontal scales of 10–100 m. Wet weight loss of plaster balls immersed in the field for 50 h was converted to the speed of steady flow (named intensity of water motion) that brought the equivalent loss in a tank experiment. The results clarified that the spatial distribution of water flow showed good correlation with that of the standing crop of Sargassum forest, and that the intensity of water motion was appreciably diminished in the Sargassum forest. We also discuss ecological implications of the reduction in water flow within the Sargassum forest for the growth and settlement of Sargassum species.
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