Metablic coupling between Nitzschia sp. and Microcystis aeruginosa in terms of phosphorus utilization during the Microcystis bloom in freshwater lakes
Microcystis bloom events threat the health of ecosystem. During the Microcystis bloom, diverse species were identified belonging to Chlorophyceae, Bacillariophyceae, Cyanophyceae and Euglenophyceae. However, the differences in phosphorus utilization strategy by these species and interaction between them are inadequately studied. Our study showed species-specific responses to phosphorus limitation among the cyanobacteria. In details, Anabaena and Aphanizomenon can effectively use dissolved organic phosphorus by excreting extracellular phosphatase as evidence by the positive enzymatic labeling of fluorescence (ELF), while Microcystis rarely had such a labeling. Additionally, during the bloom of the Microcystis aeruginosa in Chinese large lakes(Lakes Taihu and Chaohu) and Polish reservoir, Nitzschia sp. was detected to attach to the mucus of the colony. It was completely ELF-labeled while Microcystis aeruginosa wasn’t. Therefore, to compensate phosphorus deficiency, Nitzschia sp. can produce extracellular alkaline phosphatase leading to the higher phosphate concentration by enzymatic hydrolysis in the immediate vicinity of the interface of the two species, from which Microcystis aeruginosa also benefited for phosphorus availability. Shortly, our results presented a novel mechanism behind phenomenon that Microcystis and Nitzschia were the main participants of the spring bloom in a polluted eutrophic lake as observed by other researchers.
Zhou Yiyong Cao Xiuyun Song Chunlei
Institute of Hydrobiology, the ChineseAcademy of Sciences, Wuhan, China 430072
国际会议
武汉
英文
20
2011-04-05（万方平台首次上网日期，不代表论文的发表时间）