Algal Resources
Online ISSN : 2423-8473
Print ISSN : 1883-3284
一般論文
大分県別府湾に設置された貝殻混合多孔質の海藻着生基質面付き コンクリート礁における海藻の遷移
蓑口 百代小川 浩内山 幸之介大野 正夫
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2020 年 13 巻 2 号 p. 171-180

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The artificial reefs (ARs) deployed on a sandy-muddy bottom at depths of 10 to 16 m in Beppu Bay, southern Japan were investigated using ROV (Remotely Operated Vehicle) and scuba diving from 2008 to 2017. The ARs were made of cubic concrete blocks overlaid by two porous panels consisting of seashells on top side. Young thalli of Sargassum sp. appeared on the panels in the first year. The dominant macroalgal communities changed from Sargassum sp. to Ecklonia kurome after several years. Macroalgae were more abundant on the porous panel than on the other sides of the concrete blocks after ten years. The biomass of the benthos (shell fish, barnacles and bristle worms) on the surveyed blocks in March 2017 was 455.12 g/m2 on the porous panel part and 366.25 g/m2 on the smooth part of the concrete blocks. The installation of porous panel material facilitated more attachment of seaweeds than on the smoother part of the ARs making it more advantageous in creating seaweed beds.
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© 2020 日本応用藻類学会
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