Adaptive strategies utilized by different size fractions of colonial Microcystis during the outbreak of cyanobacterial blooms in Lake Chaohu, China
Considering the predominance of colonial Microcystis in the field, the present study compared physiological strategies utilized by different size fractions of colonial Microcystis during the outbreak of cyanobacterial blooms in Lake Chaohu. Biomass percentage of different size colonial Microcystis changed regularly during bloom seasons. Compared with smaller colonial Microcystis, larger colonial Microcystis phenotypes exhibited higher carotenoids content (p>00.5, ANOVA), phycocyanin (PC) percentage (p<0.05, ANOVA) and total carbohydrates (TC) content (p>0.05, ANOVA) although smaller colonial Microcystis showed higher nitrite reductase (NR) activities (p<0.01, ANOVA) and alkaline phosphatase activities (APA). Redundancy analysis (RDA) indicated that colony size could be affected by physicochemical conditions, e.g., chemical oxygen demand (CODMn), water temperature (WT), NO3--N, and so on, especially CODMn and NO3-could be indicators for the biomass of larger and smaller size colonial Microcystis species, respectively. The result of the present study provides a new insight into consideration for quick water quality monitoring, assessment and risk alert of cyanobacterial bloom. Considered comprehensively, it is speculated that the dominant adaptive selection in different size colonial Microcystis may be an adaptive mechanism promoting the formation, sustainment and longevity of cyanobacterial blooms in eutrophic and subtrophic water bodies.
Yinxia Li Dunhai Li
Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072,P.R.China Graduate School of Ch Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072,P.R.China
国际会议
武汉
英文
54
2011-04-05（万方平台首次上网日期，不代表论文的发表时间）