Dear colleagues,
the following paper was recently published in Ecotoxicology and Environmental
Safety:
Small cetaceans found stranded or
accidentally captured in southeastern Brazil: Bioindicators of essential and
non-essential
trace elements in the environment
(Leila Soledade Lemos, Jailson
Fulgencio de Moura, Rachel Ann Hauser-Davis,
Reinaldo Calixto de Campos, Salvatore Siciliano)
It can be found on the link:
http://www.sciencedirect.com/science/article/pii/S0147651313003370
or it can be requested to me ([email protected])
Abstract:Essential (Cu, Mn, Se and Zn) and non-essential (Cd
and Hg) elements were analyzed in the hepatic tissue of 22 individuals of seven
different species of small cetaceans (Feresa attenuata; Orcinus orca;
Pontoporia blainvillei; Sotalia guianensis; Stenella frontalis; Steno
bredanensis; Tursiops truncatus) accidentally caught in fishing nets or found
stranded along the northern coast of the state of Rio de Janeiro, Brazil,
between 2001 and 2010. Atlantic spotted dolphin (S. frontalis) showed the
highest levels of Cd (20.23 μg g 1, dry weight), while rough-toothed dolphin
(S. bredanensis) showed the highest levels of Hg (825.9 μg g 1 dw) and Se
(221.9 μg g 1 dw). Killer whale (O. orca) presented the highest levels of Cu
(64.80 μg g 1 dw) and Zn (2220μgg1 dw), and Guiana dolphin (S. guianensis),
the highest level of Mn (13.05μgg1 dw). Cu, Hg, Mn and Zn in the hepatic
tissue of killer whale (O. orca), Cu, Hg, Mn, Se and Zn in the hepatic tissue
of rough-toothed dolphin (S. bredanensis) and Cd and Zn in the hepatic tissue
of Guiana dolphin (S. guianensis) were significantly higher when compared to
other studies with these species around the world. No significant correlations
were observed between element accumulation and sex, sexual maturity and body
length. An analysis of the interelemental relationships in the Guiana dolphin
specimens showed strong positive correlations between Cd and Se, Cu and Zn, and
Hg and Se. Differences were observed in the bioaccumulation of elements between
the analyzed species, probably related to each species feeding habit, and
differences between different element concentrations in the different dolphin
species were probably due to the preference for certain preys and their
bioavailability in the environment. Thus, the bioavailability of the analyzed
elements in the marine environment should also be taken in consideration. This
study also presents the first data ever reported for pygmy killer whale(F.
attenuata) regarding trace element concentrations in hepatic tissue.
Kind regards,Leila Lemos
+55 21 81088524
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