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Mercury bioaccumulation increases with latitude in a coastal marine fish (Atlantic silverside, Menidia menidia)
Canadian Journal of Fisheries and Aquatic Sciences ( IF 2.4 ) Pub Date : 2017-07-01 , DOI: 10.1139/cjfas-2016-0396
Zofia Baumann 1 , Robert P Mason 1 , David O Conover 2 , Prentiss Balcom 3 , Celia Y Chen 4 , Kate L Buckman 4 , Nicholas S Fisher 5 , Hannes Baumann 1
Affiliation  

Human exposure to the neurotoxic methylmercury (MeHg) occurs primarily via the consumption of marine fish, but the processes underlying large-scale spatial variations in fish MeHg concentrations [MeHg], which influence human exposure, are not sufficiently understood. We used the Atlantic silverside (Menidia menidia), an extensively studied model species and important forage fish, to examine latitudinal patterns in total Hg [Hg] and [MeHg]. Both [Hg] and [MeHg] significantly increased with latitude (0.014 and 0.048 μg MeHg g-1 dw per degree of latitude in juveniles and adults, respectively). Four known latitudinal trends in silverside traits help explain these patterns: latitudinal increase in MeHg assimilation efficiency, latitudinal decrease in MeHg efflux, latitudinal increase in weight loss due to longer and more severe winters, and latitudinal increase in food consumption as an adaptation to decreasing length of the growing season. Given the absence of a latitudinal pattern in particulate MeHg, a diet proxy for zooplanktivorous fish, we conclude that large-scale spatial variation in growth is the primary control of Hg bioaccumulation in this and potentially other fish species.

中文翻译:

沿海海洋鱼类的汞生物积累随着纬度的增加而增加(大西洋银边鱼,Menidia menidia)

人类对神经毒性甲基汞 (MeHg) 的暴露主要是通过食用海鱼而发生的,但对影响人类暴露的鱼类甲基汞浓度 [MeHg] 大规模空间变化的潜在过程尚不清楚。我们使用大西洋银鱼 (Menidia menidia),一种广泛研究的模式物种和重要的饲料鱼,来检查总 Hg [Hg] 和 [MeHg] 的纬度模式。[Hg] 和 [MeHg] 均随纬度显着增加(幼鱼和成鱼每纬度纬度分别增加 0.014 和 0.048 μg MeHg g-1 dw)。银边性状的四个已知纬度趋势有助于解释这些模式:甲基汞同化效率的纬度增加,甲基汞流出的纬度减少,由于更长和更严冬导致体重减轻的纬度增加,粮食消费的纬度增加,以适应生长季节长度的缩短。鉴于颗粒状甲基汞(一种代表浮游动物的鱼类的饮食代表)中没有纬度模式,我们得出结论,生长的大规模空间变化是该鱼类和其他潜在鱼类中汞生物积累的主要控制因素。
更新日期:2017-07-01
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