Co-occurrence patterns of the microbial community in polycyclic aromatic hydrocarbon-contaminated riverine sediments
Co-occurrence patterns of the microbial community in polycyclic aromatic hydrocarbon-contaminated riverine sediments
复制标题
多环芳烃污染河流沉积物微生物群落共生模式
DOI：
10.1016/j.jhazmat.2018.12.071
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发表时间：
2019
影响因子：
13.6
通讯作者：
Wang Changhui
中科院分区：
文献类型：
--
作者：
Yan Zaisheng;Hao Zheng;Wu Huifang;Jiang Helong;Yang Mingzhong;Wang Changhui
研究环境和空间梯度对沉积物微生物群落的影响，特别是高污染地下沉积物的微生物群落，在自然衰减和生物修复方面受到了极大的关注。利用16SrRNA基因序列数据，研究了多环芳烃（PAH）污染河流沉积物中微生物群落的空间变异和共生模式。结果表明，从表面和地下沉积物样品中的物种往往表现出更大的共生模式和促进相互作用的沉积物微生物群落的环境严重程度增加。在较重的多环芳烃污染的沉积物中的微生物有较强的关系，更集中的网络内的微生物相比，在较低的多环芳烃污染的沉积物聚集。核心群落包含关键种（Dechloromonas、Crenothrix、Desulfuronadales、Xanthomonadales、Anaerolineaceae和Dehalococcoidales），它们对环境和空间梯度的变化做出响应。沉积物中的多环芳烃浓度，亚铁和垂直距离被确定为决定细菌群落组装的主要驱动因素。关键种与多环芳烃的生物降解和沉积物中铁的循环有关，可以协调核心群落进行生态系统过程。总的来说，这些发现为微生物群落组装提供了新的见解，并有助于利用它们在生态系统中的功能进行生物修复。
Understanding environmental and spatial gradient influences on sediment microbial communities, especially the communities of highly contaminated subsurface sediments, has received great attention with respect to natural attenuation and bioremediation. Here, we investigated the spatial variation and the co-occurrence patterns of microbial communities in polycyclic aromatic hydrocarbon (PAH)-contaminated riverine sediments by using spatial-series 16S rRNA gene data. The results showed that species from the surface and subsurface sediment samples tended to show greater co-occurrence patterns and facilitative interactions in the sediment microbial community as environmental severity increased. Microorganisms in the heavier PAH-contaminated sediment have stronger relationships and are more centrally clustered within the network compared to microorganisms in the lower PAH-contaminated sediment. The core communities harbored the keystone species (Dechloromonas,Crenothrix,Desulfuromonadales,Xanthomonadales,AnaerolineaceaeandDehalococcoidales), which responded to changes in the environmental and spatial gradients. The sediment PAH concentrations, ferrous iron and vertical distance were identified as the main drivers in determining the bacterial community assembly. The keystone species were linked to PAHs biodegradation coupled with iron cycling in sediments and could orchestrate core communities to perform ecosystem processes. Overall, these findings provide new insight into microbial community assembly and contribute to harnessing their functions in ecosystems for bioremediation.