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Persistent Organic Pollutants (Pops) in Franciscana Dolphin (Pontoporia Blainvillei) from Brazilian Southeastern Waters: Status of Contamination and Two-Decade Temporal Variations

2022; RELX Group (Netherlands); Linguagem: Inglês

10.2139/ssrn.4028277

1556-5068

Rosalinda Carmela Montone, Mariana B. Alonso, Marcos César de Oliveira Santos, Paula Méndez-Fernández, Satie Taniguchi, Ana Paula Moreno Barbosa, Renato M. Gonçalves, Carolina P. Bertozzi, Josilene da Silva, Juliana Marigo, Antonio Derley S. Pereira, Rafael André Lourenço,

Marine animal studies overview

Persistent organic pollutants (POPs) were analyzed in 137 blubber samples of Franciscana dolphin, Pontoporia blainvillei, collected from 2000 to 2018 in three regions of the state of São Paulo, Brazil: Northern São Paulo (SPN), Central São Paulo (SPC) and Southern São Paulo (SPS) that belong to the Franciscana Management Area (FMA) II. POP contents ranged from 36 to 7,186 and 81 to 42,192 ng g -1 lw for predominant compounds DDTs and PCBs, respectively. Similar profiles of PCB congeners were observed with predominance of hexachlorinated compounds and represented approximately 50% of the total PCB amount.The highest PCB contents observed in the Franciscanas from Baixada Santista (SPC) is related to the proximity of the largest urbanized and industrial region on the coast of São Paulo. SPN also showed relatively high levels of POPs carried from SPC by predominant marine currents towards north. Significant differences were observed between gender and maturity of dolphins mainly for PCBs, DDTs and Mirex. Males showed a decreasing temporal trend for POPs, which is in accordance with the regulatory periods for restricting and/or banning these compounds.