Distinct Functions and Assembly Mechanisms of Soil Abundant and Rare Bacterial Taxa Under Increasing Pyrene Stresses.
Distinct Functions and Assembly Mechanisms of Soil Abundant and Rare Bacterial Taxa Under Increasing Pyrene Stresses.
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芘胁迫增加下土壤丰富稀有细菌类群的独特功能和组装机制
DOI：
10.3389/fmicb.2021.689762
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发表时间：
2021
影响因子：
5.2
通讯作者：
Zhuang X
中科院分区：
文献类型：
--
作者：
Dong Y;Wu S;Deng Y;Wang S;Fan H;Li X;Bai Z;Zhuang X
阐明物种相互作用和组装机制在调节细菌群落结构和功能中的相对重要性，特别是丰富和稀有的亚群落，对于理解环境干扰对生态功能形成的影响至关重要。然而，关于多环芳烃(PAH)胁迫如何改变丰富而稀有的类群的稳定性和功能，人们知之甚少。在这里，我们以土壤微宇宙为模型生态系统，研究了群落聚集在确定丰富的和稀有的亚群落的结构和功能中的作用。芘的剂量效应显著改变了丰富亚群落和稀有亚群落的组成。随着Py胁迫的加剧，丰富亚群落多样性增加，稀有亚群落多样性降低。重要的是，丰富的类群比稀有类群表现出更宽的生态位宽度和环境适应性，对芘的生物降解做出了更大的贡献，而稀有类群在提高亚群落对胁迫的抗性方面发挥了关键作用，潜在地促进了群落的持久性和稳定性。此外，亚群落共生网络分析表明，丰富的类群在适应芘胁迫的过程中往往占据核心和中心地位。随机过程在丰富亚群落中起关键作用，而不是在稀有亚群落中起关键作用。总体而言，这些发现拓展了我们对丰富和稀有类群响应污染胁迫的生态机制和相互作用的理解，为丰富类群是土壤修复中生物刺激的核心目标奠定了重要的理论基础。
Elucidating the relative importance of species interactions and assembly mechanisms in regulating bacterial community structure and functions, especially the abundant and rare subcommunities, is crucial for understanding the influence of environmental disturbance in shaping ecological functions. However, little is known about how polycyclic aromatic hydrocarbon (PAH) stress alters the stability and functions of the abundant and rare taxa. Here, we performed soil microcosms with gradient pyrene stresses as a model ecosystem to explore the roles of community assembly in determining structures and functions of the abundant and rare subcommunities. The dose–effect of pyrene significantly altered compositions of abundant and rare subcommunities. With increasing pyrene stresses, diversity increased in abundant subcommunities, while it decreased in the rare. Importantly, the abundant taxa exhibited a much broader niche width and environmental adaptivity than the rare, contributing more to pyrene biodegradation, whereas rare taxa played a key role in improving subcommunity resistance to stress, potentially promoting community persistence and stability. Furthermore, subcommunity co-occurrence network analysis revealed that abundant taxa inclined to occupy the core and central position in adaptation to the pyrene stresses. Stochastic processes played key roles in the abundant subcommunity rather than the rare subcommunity. Overall, these findings extend our understanding of the ecological mechanisms and interactions of abundant and rare taxa in response to pollution stress, laying a leading theoretical basis that abundant taxa are core targets for biostimulation in soil remediation.
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