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http://dx.doi.org/10.4217/OPR.2011.33.4.421

Spatiotemporal Distribution of Macrobenthic Communities in the Coastal Area of Uljin and Its Relation to Environmental Variables  

Yu, Ok-Hwan (Marine Living Resources Research Department, KORDI)
Paik, Sang-Gyu (Marine Living Resources Research Department, KORDI)
Lee, Hyung-Gon (Marine Living Resources Research Department, KORDI)
Lee, Jae-Hac (Marine Living Resources Research Department, KORDI)
Publication Information
Ocean and Polar Research / v.33, no.4, 2011 , pp. 421-434 More about this Journal
Abstract
Although thermal effluent from coastal power plants affects marine ecosystems, few studies have examined the spatiotemporal distribution of macrobenthic communities in a coastal area of Korea with thermal discharge. This study analyzed the species composition and abundance of a macrobenthic community in relation to environmental variables for a period of 1 year. In total 334 macrobenthic faunal species were collected; the mean density was 3,221 ind/$m^2$. The number of species and the density of macrobenthic fauna increased with distance from the thermal discharge site. Cluster analysis indicated that the macrobenthic community could be divided into two groups: group I in shallow (< 30 m deep) and group II in the outer areas (> 30 m deep). Group I showed the lowest species density and diversity. Four polychaetes, including Magelona japonica, Spiophanes bombyx, Scolotoma longifolia and Chaetozone setosa, all of which have been dominant species since 1987, exhibited higher mean densities in the area distant from the thermal discharge (the outer and north areas). Conversely, the warm-adapted and opportunistic species, such as the amphipods Urothoe convexa and Mandibulophoxus mai, the bivalve Felaniella sowerbyi, and the polychaete Rhynchospio sp., were more abundant in the thermal discharge region. The results of this study indicate that thermal effluent influences macrobenthic communities in the shallow area, while other environmental variables, such as depth, sediment grain size, and TOC, are more important determinants of the macrobenthic communities in deeper regions (> 30 m deep).
Keywords
East sea; Uljin; thermal effluent; macrobenthos; community;
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