Effects of calcium levels on colonial aggregation and buoyancy of Microcystis aeruginosa.

Abstract:

:Colonial aggregation of Microcystis plays a key role in bloom formation. Limited studies have been reported about effects of environmental factors on the aggregation of Microcystis. Calcium is an important chemical element in water system. In this study, we investigated the effects of a low- (0.015 g l⁻¹) and a high-concentration of calcium (0.100 g l⁻¹) on the aggregation and buoyancy of a colonial strain M. aeruginosa XW01. Results show that compared to the low concentration of calcium, the high-calcium condition results in bigger colonial size, higher level of buoyancy and increased production of extracellular polysaccharides (EPS) of M. aeruginosa XW01. Increased production of EPS induced by the high-calcium concentration should contribute to the colonial aggregation and buoyancy of M. aeruginosa XW01. These results suggest that an increase in calcium concentration may be beneficial for Microcystis blooms occurring in a soft water lake.

journal_name

Curr Microbiol

journal_title

Current microbiology

authors

Wang YW,Zhao J,Li JH,Li SS,Zhang LH,Wu M

doi

10.1007/s00284-010-9762-7

subject

Has Abstract

pub_date

2011-02-01 00:00:00

pages

679-83

issue

2

eissn

0343-8651

issn

1432-0991

journal_volume

62

pub_type

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