在成年两动物中对甲基的广泛评估
Brian J Tornabene1, Blake R Hossack1,2, Brian J Halstead3
1U.S. Geological Survey, Northern Rocky Mountain Science Center, Missoula, Montana 59801, United States.
Environmental science & technology
|October 30, 2023
概括
甲基 (MeHg) 污染在美国两动物中普遍存在,非致死性采样显示,生物积累因物种和生命史而异,标志着MeHg水平.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 两动物生物学
背景情况:
- (Hg) 是影响野生动物的全球有毒污染物.
- 两动物面临着下降,甲基 (MeHg) 等污染物构成重大威胁.
- 两动物中MeHg暴露的广泛分布在很大程度上是未知的.
研究的目的:
- 评估美国各地两动物中MeHg生物积累的广泛分布.
- 确定影响MeHg生物积累的因素,包括生命史特征和环境指标.
- 评估非致命的采样方法来评估两动物的MeHg,包括稀有物种.
主要方法:
- 在美国11个州 (2017-2021) 进行了来自26个种群 (14个物种) 的3,241只幼虫和成年两动物的非致命采样.
- 在两动物中分析了MeHg生物积累.
- 检查了MeHg水平,两动物生命史特征 (大小,性别,物种) 和环境因素 (沉积物和中的总Hg) 之间的关系.
主要成果:
- 甲污染是普遍存在的,显示出不同地点度的33倍差异.
- 两动物的大小,性别和类型 (青,,新,) 与MeHg生物积累密切相关.
- 龙的总Hg可靠地表明两MeHg生物积累 (R2 ≥0.67),而不是沉积物Hg (R2 ≤0.04).
结论:
- 这项研究代表了对两动物MeHg生物积累的最大评估,使用了新的非致命技术.
- 在物种,生命史和地理位置之间存在MeHg生物积累的显著差异.
- 调查结果有助于识别敏感的两动物种群,并为未来的风险评估确定环境相关的MeHg度.
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