Dear collegues,
On behalf of my co-authors, I am pleased to share our new work published in
STOTEN (Science of the Total Environment) regarding temporal trends in trace
elements bioaccumulation in franciscana dolphin from Espirito Santo state coast.
The paper is available open access until November 03, 2021
at:https://authors.elsevier.com/a/1dlFZB8ccq-v0
Here is the Abstract:One of the largest environmental disasters worldwide
occurred on November 5th, 2015, when the Fundão dam collapsed in Mariana (Minas
Gerais State, Southeast Brazil). The tailing mud flooded the Doce River basin
and reached the sea in the coast of Espírito Santo State (ES), Southeast
Brazil. This coastal region is the habitat of the most isolated population of
franciscana dolphins (Pontoporia blainvillei), with the lowest populational
census and lowest genetic diversity in Franciscana Management Area Ia (FMA Ia)
- 18° 25′S and 21° 17′S. This study aimed to assess the bioaccumulation of
trace-elements (As, Cd, Cu, Fe, Hg, Mn, and Zn) in muscle, liver and kidney of
franciscana dolphins collected near the Doce River's mouth before (n = 32) and
after (n = 19) the tailing mud reached the sea. The Generalized Additive Model
(GAM) showed increasing temporal trends of Hg and Zn in muscle and liver after
the dam failure, probably related to higher concentrations and bioavailability
in the water column and sediments from the Doce River. Declining trends were
found for As and Cu muscular and hepatic concentrations and Fe concentrations
in kidney due to their lower bioavailability after the disaster, caused by
association with tailings mud trapped in the riverbanks and suspended
particulate material. Additionally, higher As and Hg concentrations found in
the first period of sampling may be due to historical contamination by mining
activities. The full extent of the impacts caused by the Fundão dam failure is
still unknown. However, due to their rapid increase and remobilization process,
toxic effects can be induced in the biota by these elements. Elements'
bioaccumulation in this study contributes to the knowledge of franciscana
dolphins from FMA Ia. Considering the conservation concern regarding this
franciscana population and its scarce knowledge, the impact of this disaster
can be alarming for species conservation.
Best 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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