TY - JOUR
T1 - Understanding the antagonism of Hg and Se in two shark species from Baja California South, México
AU - Terrazas-López, Rafael
AU - Arreola-Mendoza, Laura
AU - Galván-Magaña, Felipe
AU - Sujitha, S. B.
AU - Jonathan, M. P.
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/2/10
Y1 - 2019/2/10
N2 - 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.
AB - 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.
KW - Biomagnification
KW - Mercury
KW - Selenium
KW - Shark
KW - Southern Baja California, Mexico
UR - http://www.scopus.com/inward/record.url?scp=85052955362&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2018.08.261
DO - 10.1016/j.scitotenv.2018.08.261
M3 - Artículo
C2 - 30196220
SN - 0048-9697
VL - 650
SP - 202
EP - 209
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -