A Single Community Dominates Structure and Function of a Mixture of Multiple Methanogenic Communities
A Single Community Dominates Structure and Function of a Mixture of Multiple Methanogenic Communities
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DOI：
10.1016/j.cub.2017.09.056
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发表时间：
2017-11-06
期刊：
影响因子：
9.2
通讯作者：
Buckling, Angus
中科院分区：
文献类型：
--
作者：
Sierocinski, Pawel;Milferstedt, Kim;Buckling, Angus
微生物的生态学经常涉及整个群落的混合（群落聚结），例如，洪水事件，宿主排泄和土壤耕作[1，2]，但这一过程对群落结构和功能的影响知之甚少[3-7]。最近的理论表明，由于组成物种之间的共同进化，一个群落可能作为一个部分内聚的单位[8-11]，导致一个群落在群落合并后占主导地位。这个占主导地位的社区被预测为在孤立生长时最有效地利用资源的社区[11]。我们使用产甲烷群落对这些预测进行了实验测试，其中有效的资源利用（通过甲烷产量量化）需要物种之间的共同进化交叉喂养相互作用[12]。在实验室规模的厌氧消化器中繁殖后，社区组成（从16 S rRNA测序确定）和社区混合物的甲烷产量非常类似于孤立生长的单一最具生产力的社区。分析每个社区对最终混合物的贡献表明，社区内的某些类群组合可能是共同进化相互作用的结果。作为这些发现的必然结果，我们还表明，甲烷产量增加接种社区的数量。这些发现与理解天然微生物群落的生态动力学有关，并展示了一种可预测地增强生物技术，健康和农业中微生物群落功能的简单方法[13]。
The ecology of microbes frequently involves the mixing of entire communities (community coalescence), for example, flooding events, host excretion, and soil tillage [1, 2], yet the consequences of this process for community structure and function are poorly understood [3-7]. Recent theory suggests that a community, due to coevolution between constituent species, may act as a partially cohesive unit [8-11], resulting in one community dominating after community coalescence. This dominant community is predicted to be the one that uses resources most efficiently when grown in isolation [11]. We experimentally tested these predictions using methanogenic communities, for which efficient resource use, quantified by methane production, requires coevolved cross-feeding interactions between species [12]. After propagation in laboratory-scale anaerobic digesters, community composition (determined from 16S rRNA sequencing) and methane production of mixtures of communities closely resembled that of the single most productive community grown in isolation. Analysis of each community's contribution toward the final mixture suggests that certain combinations of taxa within a community might be co-selected as a result of coevolved interactions. As a corollary of these findings, we also show that methane production increased with the number of inoculated communities. These findings are relevant to the understanding of the ecological dynamics of natural microbial communities, as well as demonstrating a simple method of predictably enhancing microbial community function in biotechnology, health, and agriculture [13].