TY - JOUR
T1 - Biomagnification of mercury and its antagonistic interaction with selenium in yellowfin tuna Thunnus albacares in the trophic web of Baja California Sur, Mexico
AU - Ordiano-Flores, Alfredo
AU - Rosíles-Martínez, Rene
AU - Galván-Magaña, Felipe
N1 - Funding Information:
The authors thanks to Robert Olson from the Inter-American Tropical Tuna Commission (IATTC) for help and cooperation in obtaining samples; the Fish Ecology Laboratory of the CICIMAR-IPN; Jaime Ballinas Flores of the Toxicology Laboratory of FMVZ-UNAM for his help and support in treating and analyzing samples. AOF thanks the Consejo Nacional de Ciencia y Tecnología for financial support. FGM thanks to Instituto Politecnico Nacional (COFAA, EDI) for fellowships. We thank Laura Sampson for translating and editing the English version of this manuscript.
PY - 2012/12/1
Y1 - 2012/12/1
N2 - Mercury and selenium concentrations were determined in muscle of 37 yellowfin tuna (Thunnus albacares) captured aboard of Mexican purse-seiners boats off western coast of Baja California Sur, between Punta Eugenia and Cabo Falso, from October to December 2006. Also, its prey (mainly, jumbo squid Dosidicus gigas and pelagic red crab Pleuroncodes planipes) were analyzed from the stomach contents. All the mercury values obtained were lower that mercury content recommended by standard legal limits for seafood adopted by Mexican norms (typically 0.5-1.0μgg-1). Mercury concentrations vary between 0.06 and 0.51μgg-1 in yellowfin tuna, and from 0.01 to 0.20μgg-1 in its prey, suggesting that mercury can accumulate in prey tissues and that of their predator. Biomagnification factors (BMF) between predator-prey associations were calculated. The BMFs were >1, indicating that mercury biomagnifies along the food web of yellowfin tuna. In all species studied there was a molar excess of selenium over mercury. The rank order of mean selenium/mercury molar ratios was for pufferfish (42.62)> diamond squid (15.09)>yellowfin tuna (10.29)>pelagic red crab (10.05)>panama lightfish (9.54)> jumbo squid (8.91). The selenium health benefit value (Se-HBV) was calculated to have an improved understanding of the health benefits and risk of fish consumption.
AB - Mercury and selenium concentrations were determined in muscle of 37 yellowfin tuna (Thunnus albacares) captured aboard of Mexican purse-seiners boats off western coast of Baja California Sur, between Punta Eugenia and Cabo Falso, from October to December 2006. Also, its prey (mainly, jumbo squid Dosidicus gigas and pelagic red crab Pleuroncodes planipes) were analyzed from the stomach contents. All the mercury values obtained were lower that mercury content recommended by standard legal limits for seafood adopted by Mexican norms (typically 0.5-1.0μgg-1). Mercury concentrations vary between 0.06 and 0.51μgg-1 in yellowfin tuna, and from 0.01 to 0.20μgg-1 in its prey, suggesting that mercury can accumulate in prey tissues and that of their predator. Biomagnification factors (BMF) between predator-prey associations were calculated. The BMFs were >1, indicating that mercury biomagnifies along the food web of yellowfin tuna. In all species studied there was a molar excess of selenium over mercury. The rank order of mean selenium/mercury molar ratios was for pufferfish (42.62)> diamond squid (15.09)>yellowfin tuna (10.29)>pelagic red crab (10.05)>panama lightfish (9.54)> jumbo squid (8.91). The selenium health benefit value (Se-HBV) was calculated to have an improved understanding of the health benefits and risk of fish consumption.
KW - Antagonism
KW - Biomagnification
KW - Mercury
KW - Selenium
KW - Thunnus albacares
UR - http://www.scopus.com/inward/record.url?scp=84868304023&partnerID=8YFLogxK
U2 - 10.1016/j.ecoenv.2012.09.014
DO - 10.1016/j.ecoenv.2012.09.014
M3 - Artículo
SN - 0147-6513
VL - 86
SP - 182
EP - 187
JO - Ecotoxicology and Environmental Safety
JF - Ecotoxicology and Environmental Safety
ER -