Taxon-Function Decoupling as an Adaptive Signature of Lake Microbial Metacommunities Under a Chronic Polymetallic Pollution Gradient.
Taxon-Function Decoupling as an Adaptive Signature of Lake Microbial Metacommunities Under a Chronic Polymetallic Pollution Gradient.
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DOI：
10.3389/fmicb.2018.00869
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发表时间：
2018
影响因子：
5.2
通讯作者：
Derome N
中科院分区：
文献类型：
--
作者：
Cheaib B;Le Boulch M;Mercier PL;Derome N
微生物群落对人为压力的适应会导致微生物多样性的减少和生态系统服务的不平衡。这种适应可以改变具有不同分类和功能组成的群落的分子特征。了解分类和功能变异之间的关系仍然是微生物生态学中的一个关键问题。在这里，我们评估了分类和功能多样性的湖泊metacompatibility系统沿着多金属污染梯度造成的60年的慢性暴露于酸性矿山排水（AMD）。我们的研究结果突出了三个自适应签名。首先，在中度和高度污染湖泊的微生物群落中检测到分类功能解耦的特征。第二，污染和未污染的湖泊之间发生了分类组成的平行变化。第三，功能模块丰度的变化表明生态系统服务逐渐恶化（即，光合作用）和次生代谢。总体而言，丰度的类群，功能，更重要的是多金属抗性基因，如copA，copB，czcA，cadR，cCusA的变化，与微量金属含量（主要是镉）和酸度。我们的研究结果突出了多金属污染梯度在最低营养级的影响。
Adaptation of microbial communities to anthropogenic stressors can lead to reductions in microbial diversity and disequilibrium of ecosystem services. Such adaptation can change the molecular signatures of communities with differences in taxonomic and functional composition. Understanding the relationship between taxonomic and functional variation remains a critical issue in microbial ecology. Here, we assessed the taxonomic and functional diversity of a lake metacommunity system along a polymetallic pollution gradient caused by 60 years of chronic exposure to acid mine drainage (AMD). Our results highlight three adaptive signatures. First, a signature of taxon—function decoupling was detected in the microbial communities of moderately and highly polluted lakes. Second, parallel shifts in taxonomic composition occurred between polluted and unpolluted lakes. Third, variation in the abundance of functional modules suggested a gradual deterioration of ecosystem services (i.e., photosynthesis) and secondary metabolism in highly polluted lakes. Overall, changes in the abundance of taxa, function, and more importantly the polymetallic resistance genes such as copA, copB, czcA, cadR, cCusA, were correlated with trace metal content (mainly Cadmium) and acidity. Our findings highlight the impact of polymetallic pollution gradient at the lowest trophic levels.