Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Comparison of Grazing Characteristics of a Freshwater Bivalve Unio douglasiae (Unionidae) on the Cold and Warm Phytoplankton Communities in Eutrophic Lake

부영양호수의 저온기와 고온기 식물플랑크톤에 대한 말조개의 섭식능 비교

  • Lee, Song-Hee (Department of Environmental Science, Konkuk University) ;
  • Baik, Soon-Ki (Department of Environmental Engineering, Dong shin University) ;
  • Hwang, Soon-Jin (Department of Environmental Science, Konkuk University) ;
  • Kim, Baik-Ho (Department of Environmental Science, Konkuk University)
  • 이송희 (건국대학교 생명환경과학대학 환경과학과) ;
  • 백순기 (동신대학교 환경학과) ;
  • 황순진 (건국대학교 생명환경과학대학 환경과학과) ;
  • 김백호 (건국대학교 생명환경과학대학 환경과학과)
  • Published : 2009.03.31
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Abstract

Grazing effects of a freshwater bivalve, Unio douglasiae, on both the phytoplankton communities of cold- and warm eutrophic lakes were examined in aquarium with sediment. The animal U. douglasiae used in the study was collected from the Gunsan (Jeonbuk), acclimatized in laboratory aquaria with washed sand from the mussel collection stream, and starved for $2{\sim}3$ days by the experiment. Grazing experiments were performed with the surface waters collected from Lake Ilgam (Seoul) in the cold period (March 31, 2008), and the warm period (June 19, 2008), respectively. Results clearly showed that the concentration of chlorophyll-a (chl-a) and algal abundance were decreased with the increase of mussel-treated density and treated-time. At the same animal density, U. douglasiae effectively decreased the chl-a of cold-lake water (CW), compared to warm-lake water (WW). Increasing the mussel density, the filtering rate (or algal abundance) of the mussel on the CW gradually decreased, while those of WW did not increase or decrease. Major phytoplankton species Synedra ulna and Stephanodiscus hantzschii, and Scenedesmus ecornis in CW, and those of Tetraedron regulare and Pediastrum simplex in WW, were quickly decreased after the mussel stocking. Interestingly, cyanobacterium Microcystis aeruginosa in WW, not dominant species, were less removed. These results suggest that a freshwater bivalve U. douglasiae have a strategic potential to control dense hibernal diatom or green algae, rather than the cyanobacterial bloom in eutrophic water.

서로 다른 두 시기의 부영양호(일감호) 현장수에 대한 한국산 말조개(U. douglasiae)의 섭식특성을 비교 조사하였다. 두 실험수 모두 패류밀도가 클수록 엽록소 a 감소가 뚜렷하였으며, 동일한 패류밀도에서는 저온기 현장수에서 엽록소 a 감소가 더 뚜렷하였다. 저온기 현장수에서는 패류 밀도에 따른 여과율 및 식물플랑크톤 현존량 변화가 뚜렷하였으나, 고온기 현장수에서는 두 패류 밀도의 여과율 및 식물플랑크톤 현존량 변화가 유사한 경향을 보였다. 각 출현종에 대한 말조개의 조류제어능은 저온기 현장수의 S. ulna와 S. hantzschii, 고온기 현장수의 S. ecornis, T. regulare, P. simplex는 빠른 시간 내에 감소하는 경향을 보였으나, 저온기 현장수의 S. ecornis는 서서히 감소하는 경향을 보였으며, 고온기 현장수의 M. aeruginosa는 제어효율이 가장 좋지 않았다. 따라서 한국산 말조개는 저온기 규조류 대발생 수역의 생태친화적 제어에 효과적인 생물제재로서 활용이 가능할 것으로 판단되었다.

Keywords

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