Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Relative Immigration Activity of Epilithic Diatom in Sum River : Comparison of Natural and Artificial Substrate

섬강수계 부착규조의 유입능 특성: 자연기질과 인공기질의 비교

  • Yoon, Sung-Ae (Department of Environmental Science, Konkuk University) ;
  • Kim, Nan-Young (Department of Environmental Science, Konkuk University) ;
  • Byoen, Myeong-Seop (Water Environment Management Department, National Institute of Environment Research) ;
  • Kim, Baik-Ho (Department of Environmental Science, Konkuk University) ;
  • Hwang, Soon-Jin (Department of Environmental Science, Konkuk University)
  • Published : 2009.03.31
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Abstract

Effects of substrates on the relative immigration activities (RIAs) of epilithic diatoms were examined in Sum River, a tributary of South Han River, Korea. Two hundreds of tile substrates coated with 5% agar were deposited at seven study stations (30 tiles per site) for one month from March 7 to April 7, 2008. Water sampling, physico-chemical factor measurement, and diatom analysis were performed in the field and laboratory. Over the study, major epilithic diatom species were Nitzschia amphibia, Navicula subminuscula, Cymbella minuta in both the natural and artificial substrates. Two dominant species, Nitzschia amphibia and Cymbella minuta often found at seven stations. Among all observed taxa, Nav. subminuscula and Caloneis silicula showed the highest RIA, with the value over 15 throughout the study. Regarding the algal morphology, the biraphe type species showed higher RIA than any other morph, while they comprised over 55% of total biomass, indicating a density effect. Additionally, a significant relationship between RIA and 20-day deposited substrate (p<0.05) showed in two diatom species, Nitzschia fonticola, Gomphonema quadripunctatum, which showed relatively high RIAs. These results indicate that the relative immigration activities of epilithic diatom species can be influenced by algal density in the water and substrate, nutrients, and deposited time at least 20 days.

남한강 상류인 섬강수계의 부착규조 군집 및 출현종의 특성을 알아보고자 하천방향으로 수계 내 7개 지점을 선정하고, 자연기질과 인공기질에서 부착규조의 유입능(RIA) 및 기초환경조사를 실시하였다. 조사결과, 부착 규조 군집 종은 모든 기질에서 N. amphibia, Nav. subminuscula, C. minuta 등이 우점하였고, N. amphibia, C. minuta는 전 지점에 고르게 분포하였다. 조사기간 중 가장 높은 유입능을 보인 종은 Nav. subminuscula, C. silicula로 RIA 15 이상이었다. 모든 조사지점에서 높은 유입능을 보인 종은 복배선 형태를 보였으며, 각 기질에서 55% 이상의 높은 밀도를 나타냈다. 비교적 높은 유입능을 보인 N. fonticola, G. quadripunctatum은 각각 주변수의 영양염(p<0.05)과 20일 동안 배양한 인공기질에(p<0.05) 높은 상관성을 보였다. 이상의 결과를 종합하면 섬강수계의 부착규조 유입능은 조류밀도와 영양염에 의해 영향을 받으며, 인공기질의 배양기간은 20일이 적당한 것으로 판단되었다.

Keywords

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