Dear colleagues,

We are pleased to announce our recent study published in AECT:

Paulo R. Dorneles, Thaís de C. Paiva, Gabriel P. Bighetti, Dhoone Menezes,
António M. B. Marques, Patricia S. L. Anacleto, Leonardo Flach, Fabíola H.
S. Fogaça, Ana Paula C. Farro, Mariana F. Nery, Ana Lúcia
Cypriano‑Souza, Mirela
D’arc, João P. M. Torres, Mariana B. Alonso. *A Tropical Estuary Where
Mercury Does Not Biomagnify and its Adjacent Waters that Render Extremely
High  Mercury Concentrations in Top Predators*

*Abstract*

In general, mercury (Hg) undergoes biomagnification in aquatic systems. The
absence of Hg biomagnification in a certain aquatic environment constitutes
an exceptional finding and this seems to be the case for Sepetiba Bay, in
Rio de Janeiro state (RJ), Brazil. There are three distinct ecological
populations of Guiana dolphins in the Sepetiba Bay (SB)–Ilha Grande Bay
(IGB) Complex, inhabiting: (1) the inner part of SB; (2) SB entrance; and
(3) IGB. In addition, there are two other delphinid species, rough-toothed
dolphin and Atlantic spotted dolphin, that feed on the SB–IGB Complex.
Considering the widely employed use of cetaceans as sentinels of
environmental contamination by bioaccumulative toxicants, we have biopsy
sampled individuals of the abovementioned ecological populations/species
for measuring skin Hg concentrations. Two Bryde’s whales and one humpback
whale were biopsied in the SB–IGB Complex as well. Skin Hg concentrations [μg
g− 1 dry weight (dw)] of Guiana dolphins were the highest in IGB, followed
by SB entrance and the inner part of SB (0.99–5.47; 0.09–6.00; 0.08–2.22).
Considering all species investigated in the present study, skin Hg
concentrations were found in the following order: humpback whale < Bryde's
whale < Guiana dolphins from SB inner part < Guiana dolphins from SB
entrance < Guiana dolphins IGB = Atlantic spotted dolphins < rough-toothed
dolphins. The skin Hg concentrations found in Guiana dolphins from the
inner part of Sepetiba Bay (0.08–2.22) and rough-toothed dolphins from the
SB–IGB Complex (1.26–20.0) are among the lowest and highest ever reported
for dolphins worldwide, respectively.


*link: *https://rdcu.be/d0yox



Kind regards,
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