二可选择性地改变河流溶解有机碳的组成和生态系统的动态
Lauren E O'Connor1, Jennifer J Guerard2, Emma J Rosi3
1Department of Civil and Environmental Engineering, University of Delaware, 127 The Green, Newark, DE 19716, USA.
The Science of the total environment
|August 31, 2025
概括
在河流中暴露于酸农药会损害昆虫的出现,并改变溶解有机物 (DOM) 的组成. 在环境相关的度下,这会影响河流生态系统及其功能.
科学领域:
- 环境科学
- 生态毒理学
- 淡水生态
背景情况:
- 有机类杀虫剂如酸被广泛使用,但它们在低度下对河流生态系统的影响尚未完全理解.
- 已知里福斯对宏观无脊椎动物的水生毒性,但其更广泛的生态系统影响需要进一步调查.
研究的目的:
- 调查和溶解有机物 (DOM) 的环境相关度对淡水流生态的影响.
- 分析和DOM对DOM组成和分子级生态系统功能的影响.
主要方法:
- 使用人工流中宇宙来模拟流状况.
- 测量了pyrifos (5 μg L-1) 和DOM (5 mg C L-1) 对昆虫的出现,初级生产 (甲基) 和生物膜组成的影响.
- 使用激发发射光和并行因子 (PARAFAC) 分析来描述DOM组成和转移.
主要成果:
- pyrifos显著抑制了昆虫的出现,并积聚在生物膜中.
- 由于pyrifos 减少了放牧动物的数量,导致初级产量增加 (甲基).
- 观察到DOM组成的变化,增加了微生物相关成分的释放,可能会改变生态系统功能.
结论:
- 在环境相关的度下,通过影响昆虫的出现,初级生产和DOM特征来破坏淡水流生态系统.
- 这项研究为农药污染对河流生态系统动态的影响提供了新的分子层面的见解.
- 研究结果强调需要考虑农药对DOM循环和整体生态系统健康的影响.
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