[MARMAM] New publication - Organobromine in Rough-toothed dolphins from SWAO

Nara Oliveira nara.oliveiraferreira at gmail.com
Mon Apr 24 08:38:28 PDT 2023

Dear MARMAM community,

My co-authors and I are excited to share our new publication with you
entitled "*An additional threat to populations predicted to collapse:
Organobromine compounds of natural and anthropogenic sources in
rough-toothed dolphins from the Southwestern Atlantic Ocean*".

The publication goes about the bioaccumulation of natural and synthetic
organobromine compounds in rough-toothed dolphins from the SWAO, that are
closely associated with coastal environments.

You can find the full article here:


Organic contaminants with toxic effects, like the conventional brominated flame
retardants (BFRs) and BFRs of emergent concern, and their synergistic
effects with other micropollutants, can be an additional threat to
delphinids. Rough-toothed dolphins (*Steno bredanensis*) populations
strongly associated with coastal environments already face a potential risk
of decline due to high exposure to organochlorine pollutants. Moreover,
natural organobromine compounds are important indicators of the
environment's health. Polybrominated diphenyl ethers (PBDEs),
pentabromoethylbenzene (PBEB), hexabromobenzene (HBB) and the methoxylated
PBDEs (MeO-BDEs) were determined in the blubber of rough-toothed dolphins
from three ecological populations from the Southwestern Atlantic Ocean
(Southeastern, Southern and Outer Continental Shelf/Southern populations,
SE, S, and OCS/S, respectively). The profile was dominated by the naturally
produced MeO-BDEs (mainly 2′-MeO-BDE 68 and 6-MeO-BDE 47), followed by the
anthropogenic BFRs PBDEs (mainly BDE 47). Median ΣMeO-BDE concentrations
varied between 705.4 and 3346.0 ng g−1 lw among populations and ΣPBDE from
89.4 until 538.0 ng g−1 lw. Concentrations of anthropogenic organobromine
compounds (ΣPBDE, BDE 99 and BDE 100) were higher in SE population than in
OCS/S, indicating a coast – ocean gradient of contamination. Negative
correlations were found between the concentration of the natural compounds
and age, suggesting their metabolization and/or biodilution and maternal
transference. Conversely, positive correlations were found between the
concentrations of BDE 153 and BDE 154 and age, indicating low
biotransformation capability of these heavy congeners. The levels of PBDEs
found are concerning, particularly for SE population, because they are
similar to concentrations known for the onset of endocrine disruption in
other marine mammals and may be an additional threat to a population in a
hotspot for chemical pollution.

Let me know if you have any thoughts!

Kind regards,

*MSc. Nara de Oliveira Ferreira*
*Laboratório de Mamíferos Aquáticos e Bioindicadores (MAQUA -UERJ)*
Mestre em Ecologia e Evolução - Universidade do Estado do Rio de Janeiro
Doutoranda em Biofísica - Universidade Federal do Rio de Janeiro
Contato: + 55 21 98585.9916
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