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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국환경생물학회 환경생물 환경생물 제26권 제4호
발행연도
2008.1
수록면
392 - 401 (10page)

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The vertical changes (upper layer: 0~0.5 m, middle layer: 4~5 m and lower layer: 8~10 m) of the limnological variables, zooplankton dynamics and community filtration rate on the phytoplankton were evaluated monthly intervals from November 2004 to June 2007 at the artificial lake (Okjeong Lake). During the study, the annual mean of water temperatures were 15.2± 7.8�C (upper layer), 14.5±7.4�C (middle layer) and 13.0±6.2�C (lower layer), respectively (n= 30). The vertical variations of most limnological parameters (DO, pH, conductivity and turbidity) were fairly similar, except for chl.-a concentration. Annual mean of chl.-a concentration was highest at the upper layer (21.4 μg L-1), while annual means of concentrations were low at the middle layer and lower layer (4.3 μgL-1 and 3.5 μgL-1, respectively). Annual mean of Secchi depth was 261 cm (n=30). A total 45 species of zooplankton were identified (28 rotifers, 12 cladocerans and 5 copepods) during the study. The mean abundance of rotifers was highest (124±232 ind. L-1, n=90) and that of cladocerans and copepods were relatively low (22±56 ind. L-1 and 13 ±30 ind. L-1) in the whole layer. Total zooplankton abundance increased from late spring to summer, and then declined and remained low throughout the winter. The annual mean of total zooplankton filtration rate for phytoplankton at the lower layer was much higher than that of both layers (upper layer: 44.4±107.8, middle layer: 95.1±436.4 and lower layer: 158.2±436.4 mL L-1 day-1). Among the major zooplankton community, relative community filtration rate (RCFR, %) of copepods for phytoplankton (50.2~54.8%) was much higher than that of cladocerans (27.7~36.3%) and rotifers (8~17.6%). The seasonal variation of RCFRs of major zooplankton community was observed. The RCFRs of rotifers were high in winter (44.6%, n=9), while the RCFRs of cladocerans were high in summer (58.0%, n=7). In spring and fall, the RCFRs of copepods were high in the whole layer (spring: 67.4%, n=9; fall: 74.4%, n=5).

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