变暖改变了微生物介导的循环在潮间沉积物生态系统中微塑料压力下的时间模式
Xiang Yuan1, Ning Gao1, Jiayu Ma1
1College of Environmental Science and Engineering, MOE Key Laboratory of Pollution Processes and Environmental Criteria, Academy for Advanced Interdisciplinary Studies, Nankai University, Tianjin 300071, China.
Journal of hazardous materials
|December 14, 2025
概括
微塑料 (MP) 显著改变沿海沉积物的微生物群落和循环. 变暖加剧了这些影响,影响了气损失,突出了动态风险评估的必要性.
科学领域:
- 环境微生物学环境微生物学
- 海洋生态海洋生态学
- 生物地质化学生物地质化学
背景情况:
- 潮间沉积物对沿海气循环至关重要,并充当微塑料 (MP) 的沉降池.
- 微塑料污染和变暖对沉积微生物循环的综合影响仍然不太清楚.
研究的目的:
- 研究聚乙烯 (PE) 微塑料和高温如何影响潮间沉积物中的微生物群落组成和循环功能.
- 评估微塑料和变暖对转化途径和潜在的损失的相互作用影响.
主要方法:
- 在两种温度 (25°C和30°C) 下,在31天内化不同度的PE MPs (0,0.3,2.0%w/w) 的沉积物微观世界.
- 使用16S rRNA基因测序和元基因组学分析微生物社区结构.
- 量化循环基因表达和关键的物种 (NH4+,NO3−).
主要成果:
- 特别是在2.0%的PE国会议员,改变了微生物社区组成,增加了网络复杂性,随着变暖加剧了竞争互动.
- 微塑料调节了参与异样化酸盐减少 (DNRA) 和同样化酸盐减少的基因表达,影响了 (NH4+) 和 (NO3−) 动态.
- 变暖 (30°C) 重塑了微塑料驱动的变化,与25°C相比减缓了NH4+和NO3−的下降,从而减少了气损失.
结论:
- 微塑料污染对沿海沉积物微生物群落和循环功能产生重大影响.
- 温度和时间动态是改变海洋环境中微塑料污染相关的生态风险的关键因素.
- 未来对微塑料的生态风险评估必须整合气候变化变量,如温度,并考虑对生物地球化学过程的时间影响.
相关概念视频
01:25Microbial Mats
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
01:30Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
01:24Freshwater Microbial Ecology
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
01:30Microbial Wastewater Treatment
Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
01:27Microbes and Climate Change
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
01:28Microbial Bioremediation of Plastics
Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...