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Cell Lysis of Cyanobacteria and Its Implications for Nutrient Dynamics
Author(s) -
Ye Linlin,
Wu Xiaodong,
Tan Xiao,
Shi Xiaoli,
Li Daming,
Yu Yang,
Zhang Min,
Kong Fanxiang
Publication year - 2010
Publication title -
international review of hydrobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 1434-2944
DOI - 10.1002/iroh.200911194
Subject(s) - cyanobacteria , lysis , nutrient , phosphorus , incubation , chemistry , dissolved organic carbon , carbohydrate , environmental chemistry , chlorophyll a , monosaccharide , polysaccharide , food science , biology , botany , bacteria , biochemistry , ecology , genetics , organic chemistry
The dynamics of nutrients, such as phosphorus, nitrogen, and carbohydrates, during cyanobacteria cell lysis was investigated under darkness incubation in the laboratory. The cell lysis rate of cyanobacteria sampled from Lake Taihu was measured using an esterase assay. Based on particulate esterase activity, the calculated cyanobacteria lysis rate was 0.094 d –1 . During 30 days of darkness incubation, Chlorophyll a concentration decreased from 56 μg L –1 to 2.0 μg L –1 . Parallel to this, total particulate carbohydrate concentration decreased rapidly. The fluctuation of dissolved organic carbon concentration was a function of the production of non‐carbohydrate by cyanobacteria and the decomposition of carbohydrate by bacteria. Total dissolved carbohydrates and dissolved polysaccharides concentrations showed a similar pattern, declining at the beginning of the experiment and keeping relatively stable, thereafter. In contrast, the concentration of dissolved monosaccharides remained constant during the entire process. The concentrations of NH 4 + and PO 4 3– increased at the early stage, and then decreased afterwards. A gradual decrease in NO 3 – concentration after day 8 indicated that anaerobic conditions might be produced during the cell lysis process. The present results demonstrated cyanobacteria cell lysis has a big influence on the nutrient status of the surrounding water. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)