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首页> 外文期刊>Applied Microbiology >Ecological Dynamics of Toxic Microcystis spp. and Microcystin-Degrading Bacteria in Dianchi Lake, China
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Ecological Dynamics of Toxic Microcystis spp. and Microcystin-Degrading Bacteria in Dianchi Lake, China

机译：有毒微囊藻的生态动力学。滇池微生物和微囊藻毒素降解细菌

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Toxic cyanobacterial blooms directly threaten both human safety and the ecosystem of surface waters. The widespread occurrence of these organisms, coupled with the tumor-promoting properties of the microcystin toxins that they produce, demands action to mitigate their potential impacts and, thus, a robust understanding of their ecological dynamics. In the present work, the abundance of toxic Microcystis spp. and microcystin (MC)-degrading bacteria in Dianchi Lake, located in Yunnan Province, China, was studied using quantitative PCR. Samples were taken at monthly intervals from June 2010 to December 2011 at three sampling stations within this freshwater lake. Results revealed that variation in the abundance of both total Microcystis spp. and toxic Microcystis spp. exhibited similar trends during the period of the algal bloom, including the reinvasion, pelagic growth, sedimentation, and overwintering periods, and that the proportion of toxic Microcystis was highest during the bloom and lowest in winter. Importantly, we observed that peaks in mlrA gene copy numbers of MC-degrading bacteria occurred in the months following observed peaks in MC concentrations. To understand this phenomenon, we added MCs to the MC-degrading bacteria (designated strains HW and SW in this study) and found that MCs significantly enhanced mlrA gene copy numbers over the number for the control by a factor of 5.2 for the microcystin-RR treatment and a factor of 3.7 for the microcystin-LR treatment. These results indicate that toxic Microcystis and MC-degrading bacteria exert both direct and indirect effects on each other and that MC-degrading bacteria also mediate a shift from toxic to nontoxic populations of Microcystis .
机译：有毒的蓝藻繁殖直接威胁到人类安全和地表水生态系统。这些生物的广泛存在，加上它们产生的微囊藻毒素的促肿瘤特性，要求采取行动以减轻其潜在影响，从而对它们的生态动力学有深刻的了解。在目前的工作中，有毒的微囊藻属物种丰富。利用定量PCR研究了滇池中降解微囊藻毒素（MC）的细菌。从2010年6月至2011年12月，每月在该淡水湖中的三个采样站采样。结果表明，两种微囊藻的总数都在变化。和有毒的微囊藻属。在藻华期间表现出相似的趋势，包括入侵，浮游生长，沉积和越冬期，有毒微囊藻的比例在花期最高，而在冬季最低。重要的是，我们观察到MC降解细菌的mlrA基因拷贝数的峰值出现在所观察到的MC浓度峰值之后的几个月。为了理解这种现象，我们在降解MC的细菌（本研究中指定的HW和SW菌株）中添加了MC，并发现MCs显着增强了mlrA基因拷贝数，比对照的数目增加了微囊藻毒素-RR 5.2倍微囊藻毒素-LR的治疗系数为3.7。这些结果表明，有毒的微囊藻和降解MC的细菌彼此直接和间接起作用，并且，由MC降解的细菌也介导了从有毒微囊藻向无毒微囊藻的迁移。

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