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- Title
Comparative studies on physiological responses to phosphorus in two phenotypes of bloom-forming Microcystis.
- Authors
Shen, Hong; Song, Lirong
- Abstract
Toxic Microcystis blooms frequently occur in eutrophic water bodies and exist in the form of colonial and unicellular cells. In order to understand the mechanism of Microcystis dominance in freshwater bodies, the physiological and biochemical responses of unicellular (4 strains) and colonial (4 strains) Microcystis strains to phosphorus (P) were comparatively studied. The two phenotype strains exhibit physiological differences mainly in terms of their response to low P concentrations. The growth of four unicellular and one small colonial Microcystis strain was significantly inhibited at a P concentration of 0.2 mg l−1; however, that of the large colonial Microcystis strains was not inhibited. The results of phosphate uptake experiments conducted using P-starved cells indicated that the colonial strains had a higher affinity for low levels of P. The unicellular strains consumed more P than the colonial strains. Alkaline phosphatase activity in the unicellular strains was significantly induced by low P concentrations. Under P-limited conditions, the oxygen evolution rate, F v/ F m, and ETR max were lower in unicellular strains than in colonial strains. These findings may shed light on the mechanism by which colonial Microcystis strains have an advantage with regard to dominance and persistence in fluctuating P conditions.
- Subjects
MICROCYSTIS; PHYSIOLOGICAL effects of phosphorus; ALGAL blooms; EUTROPHICATION control; FRESHWATER ecology; ALKALINE phosphatase; UNICELLULAR organisms; PHOTOSYNTHETIC oxygen evolution; ELECTRON transport; BIOCHEMISTRY
- Publication
Hydrobiologia, 2007, Vol 592, Issue 1, p475
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-007-0794-3