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한국하천호수학회 / v.41, no.4, 2008년, pp.530-540 
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( Spatio-temporal Fluctuations of Size-structured Phytoplankton over an Annual Cycle in the Youngsan Lake ) |
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| 초 록 |
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| The temporal and spatial variations of size-structured phytoplankton dynamics in Youngsan Lake were investigated to explore potential mechanims controlling the dynamics in the Youngsan Lake. Field data were collected monthly from February to October, 2003 at 6 stations along the axis of Youngsan Lake. In this study, phytoplankton (chlorophyll $alpha$) were categorized into three size classes: micro-size ($>20{mu}m$), nano-size ($2{sim}20{mu}m$) and pico-size ($<20{mu}m$). Water temperature, light attenuation coefficients, PAR (photosynthetically active radiation) and suspended solids were measured to analyze relationship between physical-chemical properties and size structure of phytoplankton. Phytoplankton blooms developed during March, July and October in the upper region of the main stem whereas small-scaled spring bloom was observed in the lower region. The scales of phytoplankton blooms were higher in the upper regions than the lower region and blooms were predominated by micro-size class in upper region but predominated by nano-size class in lower region. Growth of size-structured phytoplankton appeared to be controlled by rather light availability than temperature-dependant metabolisms in the system. Phytoplankton growth may be also supported by ambient nutrients available in the water column from analyses of chlorophyll $alpha$ vs. nutrient concentrations including nitrite+nitrate and orthophosphate. Growth of nano-sized phytoplankton alone appeared to be supported by orthophosphate as well as nitrite+nitrate indicating that response of phytoplankton to nutrient inputs may be size-dependent. |
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| 키워드 |
| size-structured phytoplankton;Youngsan Lake;potential mechanism;light availability; |
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한국하천호수학회지 / v.41, no.4, 2008년, pp.530-540
한국하천호수학회
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200806942470768)
언어 : 영어 |
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| 논문 제공 : KISTI 한국과학기술정보연구원 |
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