Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Spatial Variation in Macrobenthic Communities Affected by the Thermal Discharge Volumes of a Nuclear Power Plant on the East Coast of Korea

원자력 발전소의 온배수 배출량 변화에 따른 대형저서동물 군집의 공간 변화

  • 유옥환 (한국해양과학기술원 해양생태계연구부) ;
  • 이형곤 (한국해양과학기술원 해양생태계연구부) ;
  • 이재학 (한국해양과학기술원 해양생태계연구부) ;
  • 김경태 (한국해양과학기술원 해양환경보전연구부) ;
  • 명철수 ((주)에코션) ;
  • 문형태 (한국수력원자력(주) 환경관리팀) ;
  • 변주영 (한국수력원자력(주) 환경관리팀)
  • Received : 2013.09.05
  • Accepted : 2013.12.17
  • Published : 2013.12.30
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Abstract

This study analyzed the species composition and density of a macrobenthic community according to variations in the thermal discharge volumes of a nuclear power plant before, during, and after the shutdown of the nuclear power plant during two periods. In this study, 369 macrobenthic fauna species were collected, and their mean density was 1,712 ind. $m^{-2}$. The number of species and diversity of macrobenthic fauna decreased with distance from the thermal discharge area, regardless of whether the nuclear plant shutdown or not. Many macrobenthic taxa appeared near the thermal discharge area, but polychaetes species were more prominent in outer areas than at the discharge area. The density of macrobenthic fauna decreased with distance from the thermal discharge area during a plant shutdown in the fall of 2011, but increased, except at two sites, near the discharge area in the winter of 2012. Cluster analysis indicated that the spatial distribution of the macrobenthic community changed in areas near the nuclear power plant after a shutdown period; that is, the station group I, in areas near the nuclear power plant, became narrower after the shutdown, but it recovered to previously occupied areas after the nuclear power plant began operating again. Opportunistic species, such as the polychaetes Lumbrineris longifolia (= Scoletoma longifolia) and Mediomastus californiensis, which were present in high densities near thermal discharge areas, decreased after the shutdown but recovered after the plant re-opened. The number of species and diversity of the macrofauna and the density of dominant species showed a significant correlation with temperature, except in winter periods. The results of this study revealed that changes in the amount of thermal discharge before and after the shutdown of a nuclear power plant could exert an influence on the structure of macrobenthic community within the thermal discharge areas depending on the season.

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