Historical exposure to wastewater disposal reinforces the stability of sediment bacterial community in response to future disturbance

IF 2.3 Q3 ENVIRONMENTAL SCIENCES Blue-Green Systems Pub Date : 2021-12-03 DOI:10.2166/bgs.2021.017
Jiayu Chen, Tianjiao Dai, Z. Lei, K. Shimizu, Donghui Wen, Zhenya Zhang
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Abstract

Given that long-term treated wastewater discharge may alter the microbial community of the recipient coast, it is important to evaluate whether and how the community's stability is impacted. We constructed microcosms using coastal sediments with (near-coast) and without (far-coast) a wastewater disposal history and compared the communities’ responses to p-chloroaniline (PCAN, a typical organic pollutant) in low (10 mg/L) and high (100 mg/L) concentrations. Compared to the far-coast community, the near-coast community drove faster PCAN attenuation and nitrate generation. More significant negative correlations were observed between the alpha-diversity indices and PCAN concentrations in the far-coast communities than the near-coast ones. The community turnover rate, represented by the slopes of the time–decay curves, was slower for the near-coast community (−0.187) than that for the far-coast community (−0.233), but only when the PCAN was added in low concentration. Our study revealed that the long-term wastewater disposal may cause the sediment bacterial community to be less sensitive and more stable in response to a future disturbance, demonstrating a significant historical effect of environmental context on the coastal microbial community's stability.
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历史暴露于废水处理加强了沉积物细菌群落的稳定性,以应对未来的干扰
考虑到长期处理的废水排放可能会改变受纳海岸的微生物群落,评估群落的稳定性是否以及如何受到影响是很重要的。我们使用有(近海岸)和没有(远海岸)废水处理历史的海岸沉积物构建了微宇宙,并比较了社区对低(10 mg/L)和高(100 mg/L)浓度的对氯苯胺(PCAN,一种典型的有机污染物)的反应。与远海岸群落相比,近海岸群落驱动了更快的PCAN衰减和硝酸盐生成。远海岸群落的α多样性指数与PCAN浓度之间的负相关性比近海岸群落更为显著。近海岸群落的群落更替率(由时间-衰减曲线的斜率表示)(−0.187)低于远海岸群落(−0.233),但仅当PCAN以低浓度添加时。我们的研究表明,长期的废水处理可能会导致沉积物细菌群落对未来的干扰不那么敏感,更稳定,这表明环境背景对沿海微生物群落的稳定性有着重大的历史影响。
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Blue-Green Systems
Blue-Green Systems Multiple-
CiteScore
8.70
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