与自然颗粒混合的微塑料对大夫尼亚大种群的影响
Christoph Schür1, Joana Beck2, Scott Lambert2
1Department of Environmental Toxicology, Eawag, Überlandstrasse 133, 8600 Dübendorf, Switzerland; Department Aquatic Ecotoxicology, Faculty of Biological Sciences, Goethe University, Frankfurt am Main, Max-von-Laue-Str. 13, 60438 Frankfurt am Main, Germany.
The Science of the total environment
|August 28, 2023
概括
微塑料和自然颗粒有害于淡水动物浮游生物种群. 这些颗粒的混合物导致了大夫尼亚大片的大量减少和变化的种群结构.
科学领域:
- 环境毒理学环境毒理学
- 生态毒理学 生态毒理学
- 淡水生态学 淡水生态
背景情况:
- 微塑料的毒性通常在个人层面进行评估,对人口层面影响的实验验证有限.
- 水生环境中含有合成微塑料和自然颗粒的混合物,需要研究它们的组合毒性.
- 大是了解淡水动物浮游生物对环境压力因素的反应的关键模型生物.
研究的目的:
- 实验性地研究微塑料和自然颗粒对Daphnia magna的种群水平的影响,无论是单独的还是混合的.
- 评估颗粒暴露对种群大小,结构,个体动物大小和休息卵产量的影响.
- 在一个现实的环境场景中,比较微塑料与自然颗粒的毒性及其结合效应.
主要方法:
- 达芬尼亚大种群在50天内暴露在聚烯微塑料和二氧化颗粒 (≤63微米) 中.
- 实验使用了两种粒子类型的混合物,其度为5万颗粒子/毫升.
- 记录的关键指标包括人口规模,人口结构,个体体积和休息卵产量.
主要成果:
- 与对照组相比,暴露于颗粒物显著减少了28-42%的终端种群规模.
- 微塑料和自然颗粒,特别是混合物中的微塑料和自然颗粒,都对种群规模和结构产生了不利影响.
- 含有天然颗粒 (二氧化) 的混合物比单独的微塑料产生更强的负面影响,挑战了较低自然颗粒毒性的假设.
结论:
- 暴露于合成和天然颗粒,特别是组合,对淡水动物浮游生物产生负面影响.
- 微塑料和自然颗粒的混合毒性对于了解环境影响至关重要,因为水生生物体暴露在两者之间.
- 种群级和混合物毒性研究设计对于在微塑料研究和风险评估中实现更大的环境现实性至关重要.
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