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http://dx.doi.org/10.7837/kosomes.2020.26.2.175

Characteristics of Marine Algal Communities in the Spring at Gijang-gun, Busan  

Jung, Seung-Wook (Department of Ecological Engineering, Pukyong National University)
Choi, Chang-Geun (Department of Ecological Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.26, no.2, 2020 , pp. 175-185 More about this Journal
Abstract
Quantitative and qualitative surveys were conducted during scuba diving activity between May 2017 and June 2017 in order to analyze spring marine algal community structure at Gijang-gun, Busan. A total of 121 species including 13 (10.7 %) Chlorophyta, 18 (14.9 %) Phaeophyta, and 90 (74.4 %) Rhodophyta were identified. The species count in the subtidal zone (110 species) was twice as high as in the intertidal zone (56 species). In terms of regions, 88,76, and 75 species were found in Mundong, Gongsu, and Daebyeon, respectively. Mean biomass for the whole study area was 1,501.5 g·m-2, higher for the subtidal zone (1,869.4 g·m-2) than for the intertidal zone (1,133.5 g·m-2). Mean biomass by region values were 2,234.0 g·m-2, 1,228.1 g·m-2, and 1,044.4 g·m-2 for Mundong, Gongsu, and Daebyeon, respectively. Ulva australis, Sargassum thunbergii, and Corallina pilulifera had high biomass in the intertidal zone, while Sargassum macrocarpum, Undaria pinnatifida, and Phycodrys fimbriata had high biomass in the subtidal zone. The composition ratio of marine algal functional forms suggests that the entire study area had 'Low' status, and all sites fell within 'Low' to 'Moderate' status. Results indicate that opportunistic species are widely distributed throughout the Gijang-gun coast, hence potential effects of disturbance and environmental pollution should be considered. Seaweed farming in particular - a major activity along the Gijang-gun coast -, together with effects of other anthropogenic activities such as national fishing port development and the coastal improvement project, could have long-term effects on marine algal communities. Therefore, long-term monitoring and management plans for marine algal communities will be required.
Keywords
Busan; Gijang; Marine algae; Algal community; Biomass; Community status;
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