[MARMAM] New published article- Mercury distribution and body burden in delphinids affected by a morbillivirus infection

Bárbara Manhaes barbaraa.manhaes at yahoo.com.br
Mon Sep 28 07:55:42 PDT 2020

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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