대청호 유입하천 생태계에서 동식물 플랑크톤의 종 다양성과 에너지 이동 - 옥천천을 중심으로 -

This study was conducted to understand the phytoplankton-zooplankton trophic linkage and species diversity in Daecheong ecosystem(Okcheon stream) from August 2008 to July 2009. A total of 54 phytoplankton species were identified in the water column. Among them, Bacillariophycea dominated the phytoplankton community, accounting for 35.2% of species number, followed by Chlorophycea (33.3%), Cyanophycea (25.9%), Falgellate algae (5.6%). Phytoplankton density were ranged from 2×10³ to 15×10³ cell/ml during investigation and carbon biomass was similar with density. Dominant species were 6 taxa, which were Microcystis sp., Oscillatoria sp., Aulacoseira sp., Cyclotella sp., Navicular sp., Cryptomonas sp. in water column. A total of 31 Zooplankton species were identified in the water column. Among them, Rotifer dominated the zooplankton community, accounting for 77.4% of species number, followed by Cladocera(12.9%), Copepods(12.9%). Zooplankton density were ranged from 47 inds./L to 688 inds./L during investigation and carbon biomass was the high value in October in contrast with density. Dominant species were 4 taxa, which were Rotaria sp., Brachionus sp., Asplanchna sp., Diaptomus sp in water column. Macrozooplankton(MACZ: >200μm) clearance rate were relatively high in the winter however, amount of C-flux were relatively high in the summer. Microzooplankton(MICZ: 20~60μm) clearance rate and amount of C-flux were relatively high in the spring. Each zooplankton was relatively low in fall. Also, MICZ amount of C-flux were similar than those of MACZ, while MICZ clearance rate were relatively higher than those of MACZ.