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Nutrient Limitation of Phytoplankton in the Dongbok Lake: Analyses of Long-term data and Bioassay Experiments  

Jeong, Byong-Kwan (Division of Ocean System Engineering, Mokpo National Maritime University)
Shin, Yong-Sik (Division of Ocean System Engineering, Mokpo National Maritime University)
Jang, Na-Mik (Yeongsan-River Environment Research Laboratory, National Institute of Environmental Research)
Kim, Sang-Don (Yeongsan-River Environment Research Laboratory, National Institute of Environmental Research)
Publication Information
Korean Journal of Ecology and Environment / v.41, no.3, 2008 , pp. 412-421 More about this Journal
Abstract
Nutrient limitation was examined for the Dongbak Lake based on bioassay experiments and analyses of long-term monitoring data. From the results of data analyses, molar ratios of TN/TP and DIN/DIP were higher than 16 : 1 suggesting that phytoplankton growth was potentially limited by phosphorus. Phytoplankton responded to the addition of phosphates in the incubation experiments for all seasons whereas phytoplankton did not respond to other nutrients such as ammonia, nitrate and silicates. Size fraction (net and nano size) of phytoplankton also responded to the addition of phosphorus indicating that phytoplankton growth was limited by phosphorus in the Dongbok Lake. There was also a taxonomic shift from euglenophyceae to bacillariophyceae after addition of phosphate during warm season especially.
Keywords
Dongbok lake; Redfield ratio; bioassay experiment;
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