Key Laboratory of Integrated Regulation and Resource Department on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, 1 Xikang Road, Nanjing, 210098, China.
Key Laboratory of Integrated Regulation and Resource Department on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, 1 Xikang Road, Nanjing, 210098, China.
Chemosphere. 2023 May;322:138186. doi: 10.1016/j.chemosphere.2023.138186. Epub 2023 Feb 18.
Although various persistent organic pollutants (POPs) can affect microbial communities and functions in aquatic ecosystems, little is known about how bacteria and microeukaryotes respond to the POPs in sediments planted with different submerged macrophytes. Here, a 60-day microcosm experiment was carried out to investigate the changes in the diversity and interaction of bacterial and microeukaryotic communities in sediments collected from Taihu lake, either with decabromodiphenyl ether (BDE-209) own or combined with two common submerged macrophyte species (Vallisneria natans and Hydrilla verticillate). The results showed that BDE-209 significantly decreased the bacterial α-diversity but increased the microeukaryotic one. In sediments planted with submerged macrophytes, the negative effect of BDE-209 on bacterial diversity was weakened, and its positive effect on microeukaryotic one was strengthened. Co-occurrence network analysis revealed that the negative relationship was dominant in bacterial and microeukaryotic communities, while the cooperative relationship between microbial species was increased in planted sediments. Among nine keystone species, one belonging to bacterial family Thermoanaerobaculaceae was enriched by BDE-209, and others were inhibited. Notably, such inhibition was weakened, and the stimulation was enhanced in planted sediments. Together, these observations indicate that the responses of bacteria and microeukaryotes to BDE-209 are different, and their communities under BDE-209 contamination are more stable in sediments planted with submerged macrophytes. Moreover, the effects of plant species on the microbial responses to BDE-209 need to be explored by more specific field studies in the future.
尽管各种持久性有机污染物（POPs）会影响水生生态系统中的微生物群落和功能，但对于细菌和微型真核生物如何响应沉积物中不同沉水植物中存在的 POPs 知之甚少。在这里，进行了为期 60 天的微宇宙实验，以研究来自太湖的沉积物中细菌和微型真核生物群落的多样性和相互作用的变化，这些沉积物要么含有十溴二苯醚（BDE-209），要么与两种常见的沉水植物物种（苦草和黑藻）一起。结果表明，BDE-209 显著降低了细菌的 α 多样性，但增加了微型真核生物的多样性。在种植沉水植物的沉积物中，BDE-209 对细菌多样性的负面影响减弱，对微型真核生物多样性的正面影响增强。共生网络分析表明，细菌和微型真核生物群落中以负相关关系为主，而种植沉积物中微生物物种之间的合作关系增加。在 9 个关键种中，有一个属于细菌Thermoanaerobaculaceae 科的种被 BDE-209 富集，而其他种则受到抑制。值得注意的是，这种抑制在种植沉积物中减弱，而刺激增强。总的来说，这些观察结果表明，细菌和微型真核生物对 BDE-209 的反应不同，在种植沉水植物的沉积物中，BDE-209 污染下的微生物群落更加稳定。此外，未来需要通过更具体的野外研究来探索植物物种对微生物对 BDE-209 响应的影响。
