[MARMAM] New publication - Bioaccumulation of organohalogen in kogiids

Nara Oliveira nara.oliveiraferreira at gmail.com
Tue Oct 17 13:11:33 PDT 2023

Hello MARMAM Community,

My co-authors and I are pleased to announce our new paper "The deep dive of
organohalogen compounds: Bioaccumulation in the top predators of
mesopelagic trophic webs, pygmy and dwarf sperm whales, from the
Southwestern Atlantic ocean" recently published on Chemosphere!

You can access it here: https://doi.org/10.1016/j.chemosphere.2023.140456


*Kogia sima* and *Kogia breviceps* are apex predators of mesopelagic
trophic webs being far from most anthropogenic threats. However, chemical
pollutants and naturally synthesized compounds may travel long distances.
This study aimed to use kogiid whales as sentinels of mesopelagic trophic
webs in the Southwestern Atlantic Ocean. Persistent organic pollutants
(POPs), e.g., polychlorinated biphenyls (PCBs),
dichlorodiphenyltrichloroethane (DDT) and metabolites, mirex,
hexachlorobenzene (HCB), polybrominated diphenyl ethers (PBDEs),
pentabromoethylbenzene (PBEB) and hexabromobenzene (HBB), and the naturally
produced methoxylated BDE (MeO-BDEs) were determined in the blubber of 16 *K.
sima* and 15 *K. breviceps*. Among the organochlorine compounds, DDTs were
the main group found in* K. sima* and in *K. breviceps* (1636.6 and 3983.3
ng g− 1 lw, respective medians), followed by PCBs (425.9 and 956.1 ng g− 1 lw,
respectively), mirex (184.1 and 375.6 ng g− 1 lw, respectively), and HCB
(132.4 and 340.3 ng g− 1 lw, respectively). As for the organobromine, the
natural MeO-BDEs were predominant (1676.7 and 501.6 ng g− 1 lw,
respectively), followed by PBDEs (13.6 and 10.3 ng g− 1 lw, respectively)
and PBEB (2.2 and 2.9 ng g− 1 lw, respectively). In general, POPs
concentration was higher in *K. breviceps* than in *K. sima*. Conversely,
MeO-BDEs concentration was higher in *K. sima* than in *K. breviceps*.
in concentrations in these sympatric odontocetes were attributed to
distinct species, sampling sites, and biological parameters and suggest
some level of niche segregation. It is noteworthy the long-range reach
and bioaccumulation of these synthetic compounds in an unexplored habitat,
that present an increasing economic interest.

Please, let me know if you have any comments!

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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