Ancient DNA reveals potentially toxic cyanobacteria increasing with climate change
Ancient DNA reveals potentially toxic cyanobacteria increasing with climate change
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古代DNA揭示潜在有毒蓝细菌随着气候变化而增加
DOI：
10.1016/j.watres.2022.119435
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发表时间：
2022
期刊：
影响因子：
12.8
通讯作者：
John P. Smol
中科院分区：
文献类型：
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作者：
Jifeng Zhang;Kun Shi;Hans W.Paerl;Kathleen M.Ruhl;Yanli Yuan;Rong Wang;Jie Chen;Mengjuan Ge;Lingling Zheng;Zhiping Zhang;Boqiang Qin;Jianbao Liu;John P. Smol
淡水系统中的蓝藻水华是对人类和水生生态系统健康的全球性威胁，当产生毒素的类群存在时，表现出特别有害的影响。虽然气候变化和营养盐过度富集控制了蓝藻水华的全球扩张，但由于缺乏长期监测数据，这种扩张在多大程度上反映了蓝藻的聚集，这一点仍然是未知的。在这里，我们使用沉积物DNA的高通量测序来跟踪超富营养化太湖中蓝藻群落的100年变化，太湖是中国第三大淡水湖，也是1.3亿人的主要水源。在过去的30年中，微囊藻（作为潜在的毒素生产者）的丰度稳步增加与温度升高和风速下降相关，但与湖水营养盐浓度的时间趋势无关，这突出了最近气候对潜在增加的毒素生产类群的影响。这些发现的社会环境影响令人担忧，因为持续的人为气候变化可能会抵消这一关键淡水资源的营养改善努力。
Cyanobacterial blooms in freshwater systems are a global threat to human and aquatic ecosystem health, exhibiting particularly harmful effects when toxin-producing taxa are present. While climatic change and nutrient over-enrichment control the global expansion of total cyanobacterial blooms, it remains unknown to what extent this expansion reflected cyanobacterial assemblage due to the scarcity of long-term monitoring data. Here we use high-throughput sequencing of sedimentary DNA to track ∼100 years of changes in cyanobacterial community in hyper-eutrophic Lake Taihu, China's third largest freshwater lake and the key water source for ∼30 million people. A steady increase in the abundance ofMicrocystis(as potential toxin producers) during the past thirty years was correlated with increasing temperatures and declining wind speeds, but not with temporal trends in lakewater nutrient concentrations, highlighting recent climate effects on potentially increasing toxin-producing taxa. The socio-environmental repercussions of these findings are worrisome as continued anthropogenic climate change may counteract nutrient amelioration efforts in this critical freshwater resource.