Marine and lake snows play an important ecological role in aquatic systems, and recent researches have also revealed their interactions with various pollutants. In this paper, the interaction of silver nanoparticles (Ag-NPs), a typical nano-pollutant, with marine/lake snow in the early formation stage was investigated by roller table experiments. Results indicated Ag-NPs promoted the accumulation of larger marine snow flocs while inhibited the development of lake snow. The promotion effect of AgNPs might be attributed to their oxidative dissolution into low-toxic silver chloride complexes in seawater, and the subsequent incorporation into marine snow, which would enhance the rigidity and strength of larger flocs and favor the development of biomass. Conversely, Ag-NPs mainly existed in the form of colloidal nanoparticles in lake water and their strong antimicrobial effect suppressed the growths of biomass and lake snow. In addition, Ag-NPs could also affect the microbial community of marine/lake snow, including impact on microbial diversity, and elevation on abundances of extracellular polymeric substances (EPS) synthesis genes and silver resistance genes. This work has deepened our understanding of the fate and ecological effect of Ag-NPs via the interaction with marine/lake snow in aquatic environments.

海洋和湖泊积雪在水生系统中发挥着重要的生态作用，最近的研究也揭示了它们与各种污染物的相互作用。在本文中，银纳米颗粒（Ag-NPs）是一种典型的纳米污染物，通过滚轮台实验研究了早期形成阶段的海洋/湖泊雪的相互作用。结果表明，Ag-NPs 促进了较大海洋雪絮的积累，同时抑制了湖泊积雪的发展。AgNPs的促进作用可能归因于它们在海水中氧化溶解成低毒的氯化银络合物，并随后掺入海雪中，这将增强较大絮凝物的刚性和强度，有利于生物质的发展。反过来，Ag-NPs主要以胶体纳米颗粒的形式存在于湖水中，其强大的抗菌作用抑制了生物量和湖雪的生长。此外，Ag-NPs 还可能影响海洋/湖泊雪的微生物群落，包括对微生物多样性的影响，以及细胞外聚合物 (EPS) 合成基因和银抗性基因丰度的升高。这项工作通过与水生环境中的海洋/湖泊雪的相互作用，加深了我们对 Ag-NPs 的命运和生态效应的理解。以及细胞外聚合物 (EPS) 合成基因和银抗性基因丰度的升高。这项工作通过与水生环境中的海洋/湖泊雪的相互作用，加深了我们对 Ag-NPs 的命运和生态效应的理解。以及细胞外聚合物 (EPS) 合成基因和银抗性基因丰度的升高。这项工作通过与水生环境中的海洋/湖泊雪的相互作用，加深了我们对 Ag-NPs 的命运和生态效应的理解。