State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China.
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
J Hazard Mater. 2024 Dec 5;480:135867. doi: 10.1016/j.jhazmat.2024.135867. Epub 2024 Sep 17.
Environmental microplastics (MPs) vary in abundance, shape, size, color, and polymer type in freshwater ecosystems, yet their impact on bacterial community assembly in natural lakes is unclear. Here, we examined MPs and bacterial compositions in water and sediments of Taihu Lake, China, to reveal the influence of complex MPs on the bacterial community assembly. The results showed that the complexity index of MPs significantly influenced the turnover and nestedness components of bacterial communities. In the colder season, MP complexity was significantly correlated with the turnover componentin sediments (R = 0.19, P < 0.0001), with turnover increasing as MP complexity increased. Conversely, under warmer season, MP complexity was significantly correlated with turnover and nestedness components. Additionally, the interaction effect of environmental and MP factors affected almost all components of beta diversity, particularly in cold water and sediment, with impacts on nestedness of 0.17 and 0.12, respectively, and should thus not be ignored. Our findings indicate for the first time that complex MPs significantly influence the assembly of bacterial communities in lake systems. The impact varies across seasons and future warming may exacerbate this effect, rendering it more uncertain and complex.
环境微塑料（MPs）在淡水生态系统中丰度、形状、大小、颜色和聚合物类型各异，但它们对天然湖泊中细菌群落组装的影响尚不清楚。在这里，我们研究了中国太湖的水和沉积物中的 MPs 和细菌组成，以揭示复杂 MPs 对细菌群落组装的影响。结果表明， MPs 的复杂性指数显著影响了细菌群落的周转率和嵌套性组成。在较冷的季节，MP 复杂性与沉积物中的周转率成分显著相关（R = 0.19，P < 0.0001），随着 MP 复杂性的增加，周转率增加。相反，在温暖的季节，MP 复杂性与周转率和嵌套性成分显著相关。此外，环境和 MP 因素的相互作用效应几乎影响了所有的 beta 多样性组成部分，特别是在冷水和沉积物中，对嵌套性的影响分别为 0.17 和 0.12，因此不容忽视。我们的研究结果首次表明，复杂的 MPs 显著影响湖泊系统中细菌群落的组装。这种影响因季节而异，未来的变暖可能会加剧这种影响，使其更加不确定和复杂。
