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季节性分层驱动了性源在欧湖中的生物积累

Grace J Armstrong^1,2, Sarah E Janssen¹, Ryan F Lepak³

¹U.S. Geological Survey, Upper Midwest Water Science Center, Madison, Wisconsin 53726, United States.

ACS ES&T water

|May 15, 2025

概括

欧湖表现出季节性 (Hg) 变化,影响水生生物. 鱼类和浮游生物主要从水柱中积累,而不是湖泊沉积物.

科学领域:

环境化学环境化学
水生生态学水生生态学
生物地质化学生物地质化学

背景情况:

由气候和土地利用驱动的湖泊缩破坏了循环和生物积累.
湖泊循环和浮游生物的季节性变化会影响的预测.

研究的目的:

调查城市环氧湖中的总 (THg) 和甲基 (MeHg) 的季节性变化.
为了确定的来源和生物积累途径在塞斯顿和鱼.

主要方法:

来自威斯康星州麦迪逊两个湖泊的水,沉积物,石和鱼的季节性采样.
对总 (THg) 和甲基 (MeHg) 度的分析.
稳定同位素分析 (Δ199Hg, δ202Hg) 来追踪来源.

主要成果:

沉积物THg在湖泊之间有所不同,这与流域城市化和工业历史有关.
水柱THg和MeHg显示季节性动态,在较深的水域度较高,表明存在产量.
塞斯顿MeHg在季节性季节达到峰值,受输送和水的清晰度的影响.
塞斯和鱼类同位素值表明一个共同的海底生物积累来源,独立于沉积物差异.

结论:

在这些城市环氧化湖中,的源占据了塞斯顿和鱼类生物积累的主导地位.
季节性水柱过程显著影响的动态和生物积累.
了解这些复杂的相互作用对于预测水生生态系统中的含量至关重要.

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