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过去的暴露决定了淡水微藻对草甘污染的反应

Camila Corrêa Lourenço Dos Reis¹, Thays de Andrade Guedes¹, Pablo Santos Guimarães¹

¹Universidade Federal do Rio Grande - FURG, Instituto de Ciências Biológicas (ICB), Rio Grande, RS, Brazil.

Environmental toxicology and chemistry

|January 31, 2025

概括

对草甘中间度的暴露可能会增加藻类对除草剂的耐受性. 这一发现对于理解草甘除草剂对水生生态系统和微藻种群的影响至关重要.

科学领域:

环境毒理学环境毒理学
水生生态学水生生态学
物理学的生理学

背景情况:

草甘基除草剂在全球广泛使用,对水生生态系统构成风险.
微藻形成水生食物网的基础,是重要的初级生产者.
了解除草剂对微藻的影响对于生态系统健康至关重要.

研究的目的:

评估两种绿藻对草甘基除草剂的敏感性.
调查先前暴露史对藻类种群恢复的影响.
为了确定是否同时发生会影响除草剂的毒性.

主要方法:

两种绿藻种类Desmodesmus communis和Pseudopediastrum boryanum被暴露在不同度的草甘中 (0-1000μg·L-1).
一个两步实验涉及初始暴露,然后转移到高度环境 (20,000 μg L-1).
在孤立和同时发生的条件下监测了藻类生长和种群救援的成功.

主要成果:

暴露于草甘会在两种物种中引起剂量依赖的生长抑制,无论是孤立的还是同时发生的.
曾经暴露于中间草甘度 (350-500μg·L-1) 的藻类种群在救援中取得了更好的成功.
在测试度下,物种同一性和同时出现并没有显著改变草甘的毒性.

结论:

预先暴露于中等水平的草甘可以诱导微藻的耐受性,提高它们的生存率.
水生微藻种群可能通过适应而对草甘基除草剂产生耐药性.
这些发现凸显了水生环境中广泛使用除草剂的复杂生态影响.

关键词:

这是一种不时尚的激情 (desmodesmus).这是一个伪小孩天堂 (Pseudopediastrum).增长抑制增长抑制这是一种除草剂除草剂.人口救援人口救援

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