Competition between toxic and non-toxic Microcystis aeruginosa and its ecological implication.

摘要: The frequency of toxic cyanobacterial blooms has increased in recent decades, but the factors that regulate dominance toxin-producing cyanobacteria over non-toxin-producing strains one species are still obscure. This study examined effects temperature, light intensity, nitrate and phosphate on MC-producing non-MC-producing Microcystis aeruginosa monoculture co-culture experiments. In experiments, growth rates strain were higher than those under same conditions. However, at end became surprisingly dominant all treatments except when treated with extreme low concentrations. Higher temperatures nutrient levels can shift more quickly towards strain. may be explained by allelopathic interactions through allelochemicals other secondary metabolites, not MC. Environmental such as extremely content exert an indirect effect changing production allelochemicals. Our findings highlight complications predicting competitive outcome for natural environments.