Long-term contamination of decabromodiphenyl ether reduces sediment multifunctionality: Insights from nutrient cycling, microbial ecological clusters, and microbial co-occurrence patterns,Journal of Hazardous Materials

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Long-term contamination of decabromodiphenyl ether reduces sediment multifunctionality: Insights from nutrient cycling, microbial ecological clusters, and microbial co-occurrence patterns
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-10 , DOI: 10.1016/j.jhazmat.2024.135792
Han Gao ₁ , Juan Chen ₁ , Chao Wang ₁ , Peifang Wang ₁ , Rong Wang ₁ , Bingbing Feng ₁

Affiliation

Despite the widespread detection of polybrominated diphenyl ethers in aquatic ecosystems, their long-term effects on sediment multifunctionality remain unclear. Herein, a 360-day microcosm experiment was conducted to investigate how decabromodiphenyl ether (BDE-209) contamination at different levels (0.2, 2, and 20 mg/kg dry weight) affects sediment multifunctionality, focusing on carbon (C), nitrogen (N), phosphorus (P), and sulfur (S) cycling. Results showed that BDE-209 significantly increased sediment total organic carbon, nitrate, ammonium, available phosphorus, and sulfide concentrations, but decreased sulfate. Additionally, BDE-209 significantly altered key enzyme activities related to nutrient cycling. Bacterial community dissimilarity was positively correlated with nutrient variability. Long-term BDE-209 exposure inhibited C degradation, P transport and regulation, and most N metabolic pathways, but enhanced C fixation, methanogenesis, organic P mineralization, inorganic P solubilization, and dissimilatory sulfate reduction pathways. These changes were mainly regulated by microbial ecological clusters and keystone taxa. Overall, sediment multifunctionality declined under BDE-209 stress, primarily related to microbial co-occurrence network complexity and ecological cluster diversity. Interestingly, sediment C and N cycling had greater impacts on multifunctionality than P and S cycling. This study provides crucial insights into the key factors altering multifunctionality in contaminated sediments, which will aid pollution control and mitigation in aquatic ecosystems.

中文翻译：

十溴二苯醚的长期污染降低了沉积物的多功能性：来自营养循环、微生物生态集群和微生物共存模式的见解

尽管在水生生态系统中广泛检测到多溴二苯醚，但它们对沉积物多功能性的长期影响仍不清楚。在此，进行了一项为期 360 天的微观实验，以研究不同水平（0.2、2 和 20 mg/kg 干重）的十溴二苯醚（BDE-209）污染如何影响沉积物的多功能性，重点是碳（C）、氮（N）、磷（P）和硫（S）循环。结果表明，BDE-209 显著提高了沉积物总有机碳、硝酸盐、铵、速效磷和硫化物浓度，但降低了硫酸盐浓度。此外，BDE-209 显着改变了与营养循环相关的关键酶活性。细菌群落的差异性与营养变异性呈正相关。长期暴露 BDE-209 抑制了 C 降解、 P 转运和调节以及大多数 N 代谢途径，但增强了 C 固定、甲烷生成、有机 P 矿化、无机 P 溶解和异化硫酸盐还原途径。这些变化主要受微生物生态群和关键类群的调控。总体而言，BDE-209 胁迫下沉积物的多功能性下降，主要与微生物共现网络复杂性和生态集群多样性有关。有趣的是，沉积物 C 和 N 循环对多功能性的影响大于 P 和 S 循环。这项研究为改变受污染沉积物多功能性的关键因素提供了重要见解，这将有助于水生生态系统的污染控制和缓解。

更新日期：2024-09-10

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