Dear collegues,
I am pleased to inform that our new manuscript regarding merury bioaccumulation
in Guina dolphins entitled: "Changes in mercury distribution and its body
burden in delphinids affected by a morbillivirus infection: Evidences of
methylmercury intoxication in Guiana dolphin" is published in Chemosphere
(https://doi.org/10.1016/j.chemosphere.2020.128286).
Below, you will see the abstract of the manuscript:
Abstract: An unusual mortality event (UME) attributed to morbillivirus
infection was identified in two Guiana dolphin populations from the
Southeastern Brazilian coast. The aim of this study was to characterize total
mercury (THg), methylmercury (MeHg) and selenium (Se) bioaccumulation and body
burden in Guiana dolphins from Sepetiba Bay (RJ) collected before (n = 61) and
during the UME (n = 20). Significantly lower Se concentrations were found in
the livers of individuals collected during the UME (Mann-Whitney test; p =
0.03), probably due to impairment of the detoxification process in the liver.
There were differences in THg and Se concentrations in the organs and tissues
of individuals (Kruskal-Wallis test, p < 0.05), but not MeHg (Kruskal-Wallis
test, p = 0.07). For THg, the liver showed the higher concentrations and
differed among organs and tissues analyzed such as blubber (Tukey’s test for
unequal N; p = 0.003). For Se concentrations, the skin and kidney presented the
higher concentrations and varied among other tissues/organs, like muscle
(Tukey’s test for unequal N; p = 0.02). Differences in body burdens were
observed among specimens collected previously and during the UME probably due
to the remobilization and transport of the muscle-stored MeHg to other
tissues/organs. This abrupt input of MeHg into the bloodstream may cause
serious health damage. Indeed, evidences of methylmercury intoxication was
observed in Guiana dolphins in Sepetiba Bay. In conclusion, bioaccumulation
patterns, the detoxification process and body burden were affected by
morbillivirus.
The article is available online free of charge until November 11, 2020 at the
link: https://authors.elsevier.com/a/1bnccAOM9t9ZE
Kind regards,
Bárbara Manhães Moura Reis
Doutora em Ciências Biológicas (Biofísica), Universidade Federal do Rio de
JaneiroMestre em Oceanografia, Universidade do Estado do Rio de JaneiroBióloga,
Universidade Federal do Rio de Janeiro (UFRJ)
Laboratório de Mamíferos Aquáticos e Bioindicadores "Izabel Gurgel"(MAQUA)-
FAOC (UERJ)
Avenida São Francisco Xavier 524 Maracanã- Rio de Janeiro-RJ- Cep 20550-900
Tel: (21) 2334-0795
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