Pyrethroid insecticides along the Southwestern Atlantic coast: Guiana dolphin (Sotalia guianensis) as a bioindicator

The presence of pyrethroid compounds in hepatic tissue of Guiana dolphins (Sotalia guianensis) is reported for the first time. Twelve pyrethroids were determined in 50 animals from eight locations of the Brazilian coast. The highest average concentration of total pyrethroids (∑PYR) was 1166 ng.g−1 lw, with values ranging from 148 to 5918 ng.g−1 lw, in Ilha Grande Bay, Rio de Janeiro State, while the Espírito Santo State had the highest median, 568 ng.g−1 lw. Permethrin was the predominant compound in most areas, contributing for 42% to 81% of the ∑PYR, whereas cypermethrin was the most abundant compound in Guanabara and Sepetiba bays (79% and 81%, respectively), both located in Rio de Janeiro State. Biological factors were not correlated with pyrethroids concentration. Tetramethrin and es/fenvalerate compounds were negatively correlated to the age, suggesting degradation/metabolization capacity in these animals that increases throughout life. Despite being metabolized and excreted, the wide use of these pollutants is reflected in relevant concentrations found in Guiana dolphins. This is the first study evaluating pyrethroids in a representative number of hepatic samples and covering >2600 km of coast. The overall lack of information on pyrethroids in cetaceans highlights the importance of understanding the profile and distribution of these pollutants in dolphins which exclusively inhabit the Southwestern Atlantic coast.

Bibliographic Details

Main Authors:	Vidal, Lara G., Vannuci-Silva, Monizze, Lonso, Mariana B., Feo, María Luisa, Corcellas, Cayo, Bisi, Tatiana L., Flach, Leonardo, Lima Fragoso, Ana Bernadete, Lima Silva, Flávio J., Carvalho, Vítor Luz, de Meirelles, Ana Carolina O., Domit, Camila, Barbosa, Lupercio, Cremer, Marta, Azevedo, Alexandre F., Torres, João Paulo M., Malm, Olaf, Lailson-Brito, José, Eljarrat, Ethel
Other Authors:	Ministerio de Ciencia e Innovación (España)
Format:	artículo biblioteca
Language:	English
Published:	Elsevier 2020-08-01
Subjects:	Cetaceans, Organic contaminants, Cypermethrin, Tropical oceans, Permethrin,
Online Access:	http://hdl.handle.net/10261/214368 http://dx.doi.org/10.13039/501100004837
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