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Understanding the antagonism of Hg and Se in two shark species from Baja California South, México
Science of the Total Environment ( IF 9.8 ) Pub Date : 2018-08-21 , DOI: 10.1016/j.scitotenv.2018.08.261
Rafael Terrazas-López , Laura Arreola-Mendoza , Felipe Galván-Magaña , Sujitha S.B. , Jonathan M.P.

Mercury and Selenium concentrations were determined in the muscle and liver tissues of Silky shark (Carcharhinus falciformis) and Smooth Hammerhead shark (Sphyrna zygaena) caught off Todos Santos, Southern Baja California, Mexico during August–December 2014. The average mercury concentrations in C. falciformis [(mg/kg) muscle: 3.04; liver: 3.95] and S. zygaena (muscle: 5.23; liver: 3.39) exceeded the permissible limit of 1.0 mg/kg established by the Mexican government. Biomagnification Factors (BMF) to understand the prey-predator relations were also calculated and it was observed that all BMFs were >1 indicating absolute biomagnification of Hg. Additional Se concentrations were found in C. falciformis: 5.34 mg/kg and S. zygaena: 3.29 mg/kg resulting in a molar excess of Se over Hg. Thus, our results prove to offer the basic strategies of Hg-Se biogeochemical processes in marine sharks.



中文翻译:

了解墨西哥南下加利福尼亚州两个鲨鱼物种中汞和硒的拮抗作用

确定了2014年8月至12月在墨西哥南下加利福尼亚州Todos Santos捕获的柔滑鲨(Carcharhinus falciformis)和光滑双mer鲨(Sphyrna zygaena的肌肉和肝脏组织中的汞和硒浓度。C中的平均汞浓度。镰形[[mg / kg)肌肉:3.04;肝脏:3.95]和酵母菌(肌肉:5.23;肝脏:3.39)超过了墨西哥政府规定的1.0 mg / kg的允许限量。还计算了了解捕食者与捕食者之间关系的生物放大因子(BMF),并观察到所有BMF均> 1,表明汞的绝对生物放大率。在恶性梭状芽胞杆菌中发现了其他硒浓度:5.34 mg / kg和酵母菌:3.29 mg / kg,导致Se相对于Hg摩尔过量。因此,我们的结果证明可为海鲨提供Hg-Se生物地球化学过程的基本策略。

更新日期:2018-09-07
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