Day-night Reversion in the Horizontal Distributions of Dissolved Oxygen Content and pH in a <I>Sargassum</I> Forest
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This paper examines the influence of a<I>Sargassum</I>forest on distributions of illuminance, dissolved oxygen content and pH in a small cove facing Wakasa Bay. Spatial distributions of illuminance, dissolved oxygencontent, water density and pH were observed for June 1982 during the season of luxuriant seaweed growth, and for August 1982 during the season of little growth. Observations of dissolved oxygen content, water density and pH were made during the day and at night. The values of illuminance at the sea surface were decreasedto less than 40% inside the<I>Sargassum</I>forest when the sun was highest in the sky during the season of luxuriant growth. Density stratification occurred during every observation. Dissolved oxygen content and pH showed similar patterns of spatial distribution. Their horizontal distributions reversed from day to night, and consisted of two types:(1) higher values inshore and lower values offshore in the upper layer during the day with (2) lower values inshore and higher values offshore at night. Distributions of illuminance about noon, and dissolved oxygen content andpH at night showed patterns corresponding to the vertical distribution of algal density of the<I>Sargassum</I>forest. Dissolved oxygen was supersaturated at every observation point during the daytime, but at night it was undersaturated in the lower part of the forest or along the bottom in June and August, respectively. Processes thatbrought about these spatial distributions are discussed.
- 日本海洋学会の論文
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