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Mercury increase in Lake Champlain fish: links to fishery dynamics and extreme climatic events.
Ecotoxicology ( IF 2.4 ) Pub Date : 2019-12-31 , DOI: 10.1007/s10646-019-02148-5
Mark W Swinton 1 , Sandra A Nierzwicki-Bauer 1, 2
Affiliation  

Mercury concentrations in Lake Champlain fish increased (2011-2017) for the first time in more than two decades. The increase, however, was not consistent among species or throughout the lake. Mercury concentrations in smallmouth bass and yellow perch from the three Main Lake segments increased significantly while concentrations in the eastern portions of the lake (Northeast Arm and Malletts Bay) remained unchanged or decreased; mercury concentrations in white perch remained unchanged. Factors examined to explain the increase included: atmospheric deposition, lake temperature, chlorophyll-a, fishery dynamics, lake flooding and loading of total suspended solids (TSS). This paper examines how each factor has changed between study periods and the spatial variability associated with the change. We hypothesize fishery dynamics, flooding and TSS loading may be partially responsible for the increase in fish mercury. Both growth efficiency and biomass of fish suggest mercury concentrations would increase in the Main Lake segments and decrease in the eastern portion of the lake. Additionally, two extreme climate events in 2011 resulted in extensive flooding and a four-fold increase in annual TSS loading, both potentially increasing biotic mercury with the impact varying spatially throughout the lake. Changes to the fishery and disturbance caused by extreme climatic events have increased biotic mercury and the processes responsible need further study to identify possible future scenarios in order to better protect human and wildlife health.

中文翻译:

尚普兰湖鱼类中的汞增加:与渔业动态和极端气候事件的联系。

尚普兰湖鱼中的汞浓度在过去二十多年中首次增加(2011-2017年)。但是,这种增加在物种之间或整个湖泊中并不一致。三个主要湖段的小嘴鲈鱼和黄色鲈鱼中的汞浓度显着增加,而湖东部(东北臂和马利兹湾)的汞浓度保持不变或下降;白鲈中的汞浓度保持不变。为解释增加量而检查的因素包括:大气沉积,湖泊温度,叶绿素-a,渔业动态,湖泊洪水和总悬浮固体(TSS)的负载。本文研究了每个因素在研究期间之间如何变化以及与变化相关的空间变异性。我们假设渔业动态,洪水和TSS负荷可能是鱼类汞含量增加的部分原因。鱼的生长效率和生物量都表明汞含量在主湖段将增加而在湖东部将下降。此外,2011年发生的两次极端气候事件导致洪水泛滥,每年的TSS负荷增加了四倍,这两种生物汞都有可能增加,而整个湖的影响在空间上是变化的。极端气候事件引起的渔业变化和干扰已增加了生物汞,需要进一步研究负责任的过程,以查明未来可能出现的情况,以便更好地保护人类和野生动植物的健康。鱼的生长效率和生物量都表明汞浓度在主湖段将增加而在湖东部将减少。此外,2011年发生的两次极端气候事件导致洪水泛滥,每年的TSS负荷增加了四倍,这两种生物汞都有可能增加,而整个湖的影响在空间上是变化的。极端气候事件引起的渔业变化和干扰已增加了生物汞,需要进一步研究负责任的过程,以查明未来可能出现的情况,以便更好地保护人类和野生动植物的健康。鱼的生长效率和生物量都表明汞浓度在主湖段将增加而在湖东部将减少。此外,2011年发生的两次极端气候事件导致洪水泛滥,每年的TSS负荷增加了四倍,这两种生物汞都有可能增加,而整个湖的影响在空间上是变化的。极端气候事件引起的渔业变化和干扰已增加了生物汞,需要进一步研究负责任的过程,以查明未来可能出现的情况,以便更好地保护人类和野生动植物的健康。两者都有可能增加生物汞的含量,其影响在整个湖泊中都在空间上变化。极端气候事件引起的渔业变化和干扰已增加了生物汞,需要进一步研究负责任的过程,以查明未来可能的情况,以便更好地保护人类和野生动植物的健康。两者都有可能增加生物汞的含量,其影响在整个湖泊中都在空间上变化。极端气候事件引起的渔业变化和干扰已增加了生物汞,需要进一步研究负责任的过程,以查明未来可能出现的情况,以便更好地保护人类和野生动植物的健康。
更新日期:2020-01-04
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