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Cadmium and lead toxicity and bioaccumulation in Microcystis aeruginosa

Content Provider	Springer Nature Link
Author	Rzymski, Piotr Poniedzialek, Barbara Niedzielski, Przemysław Tabaczewski, Piotr Wiktorowicz, Krzysztof
Copyright Year	2013
Abstract	The growth of human population leads to intensification of agriculture and promotes, through eutrophication, development of cyanobacteria. One of the most widespread and bloom-forming species in freshwater is toxic Microcystis aeruginosa (M. aeruginosa). Combustion of fossil fuels and metallurgical processes are the main sources of heavy metals contamination in surface water including cadmium (Cd) and lead (Pb). The following study was conducted in order to determine the effect of 1–20 mg·L$^{−1}$ of Cd and Pb on photochemistry (using flow cytometry) and growth (based on chlorophyll concentration) of M. aeruginosa as well as to estimate levels of metal bioaccumulation. We have found that 1–10 mg·L$^{−1}$ of Cd and 1–5mg·L$^{−1}$ of Pb induced continuous enhancement of chlorophyll fluorescence during 24 h of incubation. No significant degradation of chlorophyll was observed in these samples. At higher concentrations of 20 mg·L$^{−1}$ of Cd and 10–20 mg·L$^{−1}$ of Pb chlorophyll level significantly decreased and its fluorescence was quenched. M. aeruginosa demonstrated high capability of Cd and Pb bioaccumulation, proportionally to initial metal concentration. In samples with initial concentration of 20 mg·L$^{−1}$ of Cd and Pb bioaccumulation of 87.3% and 90.1% was observed, respectively. Our study demonstrates that M. aeruginosa can potentially survive in highly metals polluted environments, be a primary source of toxic metals in the food chain and consequently contribute to enhanced toxicity of heavy metals to living organisms including human.
Starting Page	427
Ending Page	432
Page Count	6
File Format	PDF
ISSN	20952201
Journal	Frontiers of Environmental Science & Engineering in China
Volume Number	8
Issue Number	3
e-ISSN	2095221X
Language	English
Publisher	Higher Education Press
Publisher Date	2013-09-17
Publisher Institution	Chinese Universities
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Microcystis aeruginosa heavy metals bioaccumulation chlorophyll flow cytometry Environment
Content Type	Text
Resource Type	Article
Subject	Environmental Science

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