Trace elements in marine organisms of Magdalena Bay, Pacific Coast of Mexico: Bioaccumulation in a pristine environment
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2018-09-26
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Abstract
Trace element (Fe, Mn, Cr, Cu, Ni, Co, Pb,
Zn, Cd, As, Hg) concentrations were assessed in
marine organisms (n = 52) sampled from the Magdalena
Bay lagoon complex in Baja California Sur,
Mexico, a pristine marine environment. The overall
trend of metal concentrations (dry weight) in the
organisms was found to be Fe[Zn[Cd[Cu[
Mn[Pb[As[Hg[Ni[Cr[Co. Bivalve mollusks
(53.83 mg kg-1) contained twofold higher
levels of metals than the finfishes (20.77 mg kg-1).
Calculated BioConcentration Factor (BCF) values
showed that dissolved Mn is readily bioavailable to
the organisms, whereas Biota Sediment Accumulation
Factor (BSAF) indicated high values for Zn, Cu and
Cd. Cd and As levels were observed to be increasing
with the trophic levels. Toxic elements, namely Pb, Cd
and As in the studied fish species were found to be
higher than the values recommended for human
seafood consumption. The study provides a comprehensive
baseline report on trace element bioaccumulation
in several marine organisms that will aid in
developing effective conservation strategies of the
highly biodiverse lagoon complex.
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