Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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The Fluctuation of Biological Communities as an Effect of Marine Sand Mining in the Gyeonggi Bay

경기만의 해사채취에 의한 생물군집 구조변동

  • Son, Kyu-Hee (Department of Oceanography, College of Natural Science Inha University) ;
  • Han, Kyung-Nam (Department of Oceanography, College of Natural Science Inha University)
  • 손규희 (인하대학교 자연과학대학 해양과학과) ;
  • 한경남 (인하대학교 자연과학대학 해양과학과)
  • Published : 2007.09.30
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Abstract

The purpose of this study was to investigate effects of large scale marine sand mining on the marine ecological community. For the study, four stations along the coast were selected and monitored in 1998 and 2001 at mining areas and non-mining areas about the Gyeonggi Bay. The result revealed that in 1998, 9 species of fishes, 16 species of crustaceans, and 6 species of mollusks were collected where as in 2001, 11 species of fishes, 5 species of crustaceans, and 2 species of mollusks were collected, uncovering the fact that fishes have diversified while crustaceans and mollusks have reduced on a grand scale. Also, there were two key characteristics regarding the changes of biological communities in mining and nonmining areas. The first was the dwindling of crustaceans inhabiting the sand area. This outcome may be accounted for by the facts that physical removal of seabed sediments and re-sediment due to expansion of floating particles cause direct influence on the ocean floor ecosystem and have continuous effect on the communities of crustaceans which feed on them. Secondly, the newly arrived species and their population during spring and summer seasons have increased in the non-mining areas and have decreased in the mining area. It can be concluded that highly nomadic fish species migrate toward areas with less disturbance or destruction of ecosystem from marine sand mining, and consequently, the communities of fishes change in the sea area. Setting aside the characteristics of the investigated sea areas where the arriving conditions of species vary by seasons, the clear differences of population of organisms in those areas are due to environmental alterations owing to the marine sand mining ; if those large-scale marine sand mining activities continue in the Gyeonggi Bay, their effects on biological communities in the areas will only grow.

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References

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