Biodiversity and species competition regulate the resilience of microbial biofilm community
Biodiversity and species competition regulate the resilience of microbial biofilm community
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DOI：
10.1111/mec.14356
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发表时间：
2017-11-01
影响因子：
4.9
通讯作者：
Deng, Ye
中科院分区：
文献类型：
--
作者：
Feng, Kai;Zhang, Zhaojing;Deng, Ye
生物多样性与生态系统稳定性之间的关系在微生物群落中知之甚少。微生物电解池（MEC）中的生物膜群落具有物种数量适中、功能性状易处理等特点，为验证微生物生态系统的生态学理论提供了理想的平台。在这里，我们调查了生物膜群落的多样性梯度的弹性，并探讨了生物多样性和稳定性之间的关系，在响应pH冲击。结果表明，pH扰动后，所有生物反应器均能恢复到稳定运行状态，表现出较强的恢复能力。对微生物组成的进一步分析表明，吉西他滨和其他外生产电菌的反弹有助于恢复效力，并且甲烷短杆菌的存在可能延迟生物膜的功能恢复。生物多样性高的微生物群落恢复较快，表明生物多样性高的生物膜对环境扰动具有较好的恢复能力。网络分析结果表明，随着恢复时间的延长，优势菌Gebrillus和Methanobrevibacter之间的负相互作用增强，表明生物膜群落的恢复能力可能受到关键功能类群的内部资源或空间竞争的影响。这项研究为我们理解多样性与生态系统功能之间的关系提供了新的见解。
The relationship between biodiversity and ecosystem stability is poorly understood in microbial communities. Biofilm communities in small bioreactors called microbial electrolysis cells (MEC) contain moderate species numbers and easy tractable functional traits, thus providing an ideal platform for verifying ecological theories in microbial ecosystems. Here, we investigated the resilience of biofilm communities with a gradient of diversity, and explored the relationship between biodiversity and stability in response to a pH shock. The results showed that all bioreactors could recover to stable performance after pH disturbance, exhibiting a great resilience ability. A further analysis of microbial composition showed that the rebound of Geobacter and other exoelectrogens contributed to the resilient effectiveness, and that the presence of Methanobrevibacter might delay the functional recovery of biofilms. The microbial communities with higher diversity tended to be recovered faster, implying biofilms with high biodiversity showed better resilience in response to environmental disturbance. Network analysis revealed that the negative interactions between the two dominant genera of Geobacter and Methanobrevibacter increased when the recovery time became longer, implying the internal resource or spatial competition of key functional taxa might fundamentally impact the resilience performances of biofilm communities. This study provides new insights into our understanding of the relationship between diversity and ecosystem functioning.