<br>氧化还原梯度驱动以污水为主的河流的潜流带中的微生物群落组装模式和分子生态网络,Water Research

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氧化还原梯度驱动以污水为主的河流的潜流带中的微生物群落组装模式和分子生态网络
Water Research ( IF 11.4 ) Pub Date : 2023-11-20 , DOI: 10.1016/j.watres.2023.120900
Yuming Wang ₁ , Yutao Wang ₁ , Jiahui Shang ₁ , Longfei Wang ₁ , Yi Li ₁ , Ziyi Wang ₁ , Yina Zou ₂ , Wei Cai ₃ , Linqiong Wang ₄

Affiliation

污水排放对受纳水体的影响一直是研究热点。尽管如此，关于潜流区（HZ）中微生物群落组装模式响应微环境变化（例如溶质转运和氧化还原梯度变化）的信息有限。使用两条具有代表性的以污水为主的河流作为模型系统，通过基于零模型和中性模型的方法，解开了浅层河床沉积物中含氧和缺氧区域的时空细菌群落动态和组装模式。群落组成中的细菌动态是由环境过滤（即环境变量的影响）驱动的，而不是地理距离（即沉积物的深度）。夏季采集的样品中的群落很大程度上是由随机性决定的，其中同质选择在好氧区（~39%）所占的比例高于低氧区（~23%）。确定性过程导致含氧区样本的群落结构更加复杂，而弱氧区的种间相互作用则减弱。证实了非中性群落的丰富性和丰度控制着含氧区的确定性聚集。归因于“连接器”和“网络枢纽”的关键物种分别主导了冬季和含氧区收集的样本中的群落组装变化。 β-最近分类单元指数与溶解有机氮（DON）和硝酸盐之间的显着正相关关系突出了它们通过含氧区的确定性选择压力在群落组装中的重要作用。冬季群落转变的氮物种显着性阈值（ΔDON：2.81 mg-N/L，ΔNO3−：1。09 mg-N/L）低于夏季，这可能意味着在寒冷季节应制定更严格的出水质量标准。结合起来，我们的工作首次揭示了氧化还原分区在驱动 HZ 微生物群落组装中的作用，这对于指导以污水为主的河流的生态修复过程具有重要意义。

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Redox gradients drive microbial community assembly patterns and molecular ecological networks in the hyporheic zone of effluent-dominated rivers

The impacts of effluent discharge on receiving waterbodies have been a research hotspot. Nonetheless, limited information is available on the microbial community assembly patterns in the hyporheic zones (HZ) responding to the changes in the microenvironments, e.g., solute transport and redox gradient variations. Using two representative effluent-dominated rivers as model systems, the spatio-temporal bacterial community dynamics and assembly patterns in oxic and suboxic zones in the shallow riverbed sediments were disentangled via null model- and neutral model-based approaches. Bacterial dynamics in community composition were observed driven by environmental filtering, i.e., impacts of environmental variables, more than geographic distances, i.e., the depths of sediments. The communities in samples collected in summer were largely shaped by stochasticity, in which homogeneous selection occupied a higher proportion in oxic (∼39%) than in suboxic zone (∼23%). Deterministic processes contributed to a more complex community structure for samples from oxic zones, whereas weakened the interspecies interactions in suboxic zones. The richness and abundances of non-neutral community were confirmed governing the deterministic assembly in oxic zones. Key species ascribed to ‘connectors’ and ‘network hubs’ dominated the community assembly variations in samples collected in winter, and in oxic zones, respectively. Significant positive relationships between β-nearest taxon index and dissolved organic nitrogen (DON) and nitrate highlighted their vital roles in community assembly via deterministic selective pressures in oxic zones. The significance thresholds of nitrogen species for community transition in winter (ΔDON: 2.81 mg-N/L, ΔNO3−: 1.09 mg-N/L) were lower than in summer, probably implying that stricter effluent quality standards should be established in colder seasons. Combined, our work poses first insights on the roles of redox zonation in driving microbial community assembly in HZ, which is of significance in guiding ecological remediation processes in effluent-dominated rivers.

更新日期：2023-11-20

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