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Seasonality and Community Structure of Subtidal Benthic Algae from Daedo Island, Southern Korea

Seasonal and spatial variations of subtidal algae are described from Daedo Island in southern Korea based on quantitative and qualitative estimates of species occurrence in three habitats: shelf, crest and drop off. Maximum species diversity occurred during the winter. Perennial algae, including Gradlaria textorii, Ecklonia cava and Undaria pinnatifida became particularly abundant in spring. There was a dramatic increase in crustose red algae and Cyanobacteria in the summer. As autumn approached the cover of large perennial species decreased. In general, the number of species decreased with increasing depth. The subtidal shelf habitat showed an assemblage of bushy or thin-bladed forms such as Uha pertusa, Sargassum thunbergii and Corallina offlcinalis. Sargassum horneri, S. confusum, Undaria pinnatifida and Myagropsis myagroides had high cover in the crest habitat. Gradlaria texiorii and Ecklonia cava occurred only on the crest and drop off habitats. Sampling at this site in the autumn of 1995 relative to the autumn of 1994 showed about a 50% decline in number of species, with a further decline by the autumn of 1996. These changes are attributed to increased sediment load and scouring resulting from heavy construction in the area (coal-fired power plant). Despite these perturbations, the basic pattern of seasonal cycling, as modeled with principal component analysis, was maintained during the 1995—1996 sampling period.