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在一条大,堵塞的河流沿线的鱼类中发现的元素和omega-3脂肪酸

Jenni Velichka¹, Karen A Kidd², Kelly Munkittrick³

¹Department of Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4K1, Canada.

Environmental pollution (Barking, Essex : 1987)

|August 16, 2023

概括

河显著改变了鱼类的饮食和污染物水平. 水库中的鱼类含有有益的矿物质,但含有更高的,而上游鱼类的含量较低. 位置和物种对污染物和营养物质的积累有影响.

科学领域:

环境科学环境科学
生态毒理学生态毒理学
水生生态学水生生态学

背景情况:

河可以捕捉结合沉积物的元素,影响水化学和食物网.
水电大改变水生生态系统,可能会影响鱼类污染物和营养水平.
了解这些影响对于渔业管理和公共卫生至关重要,特别是对于土著社区.

研究的目的:

调查麦克塔奎克发电站 (MQGS) 如何影响鱼类中的污染物 () 和营养物质 (欧米茄-3脂肪酸,稳定同位素) 积累.
为了比较水上游 (水库和河流) 和水下游的鱼类组成.
评估水引起的变化对食物网动态和鱼类化学成分的影响.

主要方法:

在2020-2021年从沃拉斯托克和圣约翰河收集的小口,黄,美国和条纹.
分析了鱼类组织的 (Hg),30种其他微量元素,欧米茄-3脂肪酸 (EPA,DHA) 和稳定的同位素 (δ15N,δ13C).
与MQGS大相比,来自水库,上游河流和下游地区的鱼类之间的污染物和营养水平的比较.

主要成果:

来自水库的鱼类显示了高水平的有益元素 (P,S,K),但也含有 (Hg).
来自水库上游的鱼类含有较低的有毒元素,包括Hg.
达姆改变了食物网的动态,由下游的δ15N增加和水库鱼的δ13C枯竭表明. DHA和Hg与δ15N正相关;小口鱼中的EPA与δ13C相关.

结论:

麦克塔奎克发电站大改变了食物网的动态以及鱼类中污染物和营养素的吸收.
鱼类的位置 (水库与河流) 和物种是决定污染物暴露和营养价值的关键因素.
这些发现对于评估从受大影响的河流系统中消费野生鱼的风险和益处至关重要.

关键词:

生态毒理学生态毒理学这些元素元素.渔业渔业渔业是一个水力发电大是一个水力发电大.水星水星水星水星水星欧米茄-3 脂肪酸欧米茄-3 脂肪酸

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