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The bioeffect of natural colloids on the growth of Microcystis aeruginosa in Lake Taihu, China. |
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Abstract To study the effect of natural colloids on the growth of Microcystis aeruginosa , water samples were collected from Meiliang Bay in Tahu Lake. Colloid concentrates were obtained by employing a cross-flow filtration system to ultrafilter the pre-filtrated(by 1μm membrane) water samples, with a 1 kDa membrane. Natural and sterilized colloid concentrates together with pure water were mixed in the ratios of 5%, 10%, 25%, then inoculated with Microcystis aeruginosa and cultivated in exponential phase. The added of natural colloids and sterilized colloids could stimulate the growth of Microcystis aeruginosa, and the stimulation of sterilized colloids on Microcystis aeruginosa was greater than natural colloids. The added colloidal organic phosphorus accelerating the absorption of dissolvable inorganic phosphorus was the main reason of stimulating effect, and the supplement of nutrient adsorbed on colloid was a another favorable factor. Besides, colloid being the carrier of trace elements also was a reason of stimulating effect of colloid on Microcystis aeruginosa.
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Received: 08 September 2008
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