Effects of Domestic Freshwater Shellfishes on the Water Quality in the Eutrophic Agricultral Reservoir

부영양 저수지에서 국내 담수산 패류가 수질에 미치는 영향

  • Hwang, Soon-Jin (Department of Environmental Science, Konkuk University) ;
  • Park, Ku-Sung (Department of Environmental Science, Konkuk University) ;
  • Baik, Soon-Ki (Department of Environmental Engineering, Dongshin University) ;
  • Kim, Baik-Ho (Department of Environmental Science, Konkuk University)
  • 황순진 (건국대학교 환경과학과) ;
  • 박구성 (건국대학교 환경과학과) ;
  • 백순기 (동신대학교 환경공학과) ;
  • 김백호 (건국대학교 환경과학과)
  • Received : 2009.11.10
  • Accepted : 2009.12.14
  • Published : 2010.01.30

Abstract

Water quality and plankton community dynamics after the introduction of two domestic freshwater shellfishes (Unio douglasiae Griffith & Pidgeon and Cipangoplaudina chinese malleata Reeve), were monitored daily in enclosures, which constructed in the tidal zone of eutrophic agricultural reservoir (Shingu reservoir, Korea) for one week between July 31 and August 6, 2007. This biomanipulation study to improve the water quality of eutrophic lake, comprised eight enclosures (duplicate x four kinds), enclosure had no mussels (Control), stocked only with U. douglasiae at density of 60 individuals (UD), stocked only with C. chinese malleata at density of 60 individuals (CCM), and combined-stocked with 30 individuals of UD and 30 individuals of CCM (MIX), respectively. Our results clearly indicate that UD strongly decreased the concentration of chlorophyll-a and increased the water transparency, whereas CCM and MIX (included CCM) did increase algal density or decrease transparency, due perhaps to the disturbance of C. chinese malleata. Therefore, the field application of shellfish to enhance the water quality of eutrophic agricultural reservoir, should consider the grazing characteristics of biological control agents, especially active moving animals like snail.

Keywords

References

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