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KMID : 1171820040190020051
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Journal of Environmental and Sanitary Engineering
2004 Volume.19 No. 2 p.51 ~ p.59
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The structure of the plankton community and the cyanobacterial bloom during the rainy season in mesoeutrophic lake (Lake Juam), Korea
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Kim Baik-Ho
Hwang Su-Ok
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Abstract
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The rainy season and a cyanobacterial bloom, abundance and distribution of bacteria, picocyanobacteria(PC), autotrophic nanoflagellates(ANF), heterotrophic nanoflagellates (HNF), ciliates, and zooplankton were examined in relation to physicochemical variables in mesotrophic Lake Juam, Korea. Three species dominated the phytoplankton community even in the cold season; Cyclotella meneghinana and Aulacoseira granulate (Bacillariophyceae), and Cryptomonas tetrapyrenoidsa (Cryptophyceae) contributed over 67% to the total phytoplankton biomass. The cyanobacterial component of the algal bloom changed remarkable in biomass and species composition. The phytoplankton abundance (Chl α) and water quality (COD and TP), were markedly influenced by heave rain during the summer. The abundance of Cryptomaonas was closely related to that of HNF, nauplii, rotifers and ciliates. The abundance of rotifers was highly correlated to that of bacteria, PC and ANF.
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KEYWORD
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cyanobacterial bloom, rainfall, phytoplankton, physicochemical variables
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