[MARMAM] New Paper - POPs in delphinid from the South Atlantic

Nara Oliveira nara.oliveiraferreira at gmail.com
Tue Nov 16 05:34:43 PST 2021

Dear All,

my co-authors and I are pleased to announce the recent publication of our
new paper "Long-Term Consequences of High Polychlorinated Biphenyl
Exposure: Projected Decline of Delphinid Populations in a Hotspot for
Chemical Pollution" on Environmental Science and Technology.
This paper concerns the high bioaccumulation of POPs, especially PCB, in
rough-toothed dolphins from the South Atlantic and the potential risks of
population collapse associated with the high chemical exposure.

You can access the paper on:
doi: https://doi.org/10.1021/acs.est.1c03837

Rough-toothed dolphins, *Steno bredanensis*, are closely associated with
coastal waters in the Southwestern Atlantic Ocean, increasing the exposure
to multiple stressors, such as chemical pollution. Persistent organic
pollutants (POPs) are known to affect the health of cetacean species. To
comprehend the potential impacts of POPs on populations’ viability, it is
necessary to distinguish populations and predict their risk of long-term
exposure. Blubbers of rough-toothed dolphins (*n* = 28) collected along the
southeastern (SE) and southern (S) Brazilian coast were screened for
polychlorinated biphenyls (PCBs) and pesticides in a gas chromatograph
coupled to a mass spectrometer. Based on the contamination profile, a
discriminant function analysis separated the rough-toothed dolphins into
three ecological populations: two coastal and one offshore. POP
concentrations were the highest reported for the species worldwide and
highest among the delphinids in Brazilian waters, reaching 647.9 μg g–1 lw
for PCBs. The SE population presented 212.9 ± 163.0, S population presented
101.0 ± 96.7, and OCS/S population presented 183.3 ± 85.3 μg g–1 lw (mean ±
SD) of PCBs. The potential risk of effects triggered by elevated PCB
concentrations was assessed in an individual-based model. A risk of severe
decline in population size is projected for the three populations in the
next 100 years, especially in SE Brazil, varying between 67 and 99%.

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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