淡水食物网中的十八种微量元素的热量放大率
Alexander R Pelletier1, Francisco Villamarin2, João V Campos-Silva3
1Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, Saskatchewan S7N 5B3, Canada.
The Science of the total environment
|December 19, 2024
概括
大多数微量元素在水生食物网中生物稀释,是唯一的生物放大元素. 热带转移率各不相同,这表明生态因素比元素性质更有影响力.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 生物地质化学生物地质化学
背景情况:
- 微量元素在动物生理学中至关重要,但它们在食物网中的食物转移是鲜为人知的.
- 了解元素如何通过食量级移动对于评估生态风险至关重要.
研究的目的:
- 量化19种微量元素在各种水生食物网中的热带转移率.
- 研究元素性质和生态因素对微量元素生物放大或生物稀释的影响.
主要方法:
- 从31个淡水地点测量了动物浮游生物,软体动物,昆虫和鱼类中的元素度和同位素.
- 计算热量放大因子 (TMFs) 来评估生物放大 (TMF > 1) 和生物稀释 (TMF < 1).
- 利用模型选择将TMF与元素属性 (如共价键索引) 相关联.
主要成果:
- (Hg) 是唯一的生物放大元素 (TMF 中位数 = 3.77).
- (Se) 显示中性转移 (TMF 中位数 = 1.01).
- 其他16种元素,包括 (U) 和 (Tl),具有显著的生物稀释,中位数TMF从0.07到0.60.
结论:
- 水生食物网通常会生物稀释大多数微量元素,只有是值得注意的例外.
- 生态因素似乎在TMF变异性中起着更大的作用,而不是固有的元素性质.
- 建议对具有高共价键指数的特定元素进行进一步的研究,以探索潜在的生物放大.
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