Presence of aldicarb and carbofuran in liver and aqueous humor samples of wild carnivores dead by motor vehicle collision in São Paulo, Brazil: Preliminary results

Marina Pellegrino da Silva, Vagner Gonçalvez Jr, Mauricio Candido da Silva, Priscila Rodrigues de Sousa, José Luiz Catão Dias, Pedro Enrique Navas-Suárez

Agriculture is one of the most important economic pillars in the Brazilian economy. Thus, in order to maintain or even increase their productivity, rural farmers make use of technological resources, such as roads and agricultural inputs (e.g., pesticides, fertilizers). In an international context, Brazil is the largest consumer of agrochemicals. On the other hand, Brazil has the greatest biodiversity in the world. The interface between agricultural productivity and biodiversity conservation involves interactions where the impacts of wildlife exposure to various pesticides is still unknown. Thus, this study sought to identify the presence of two carbamate compounds (aldicarb and carbofuran) in liver and aqueous humor of wild carnivores dead by motor vehicle collision in roads of São Paulo, Brazil. From January/2017 to December/2018, 34 roadkills have been recorded representing 9 species. Biological and epidemiological data are collected, necropsy and sample collection are performed. Carbamates detection were carried out by High-Performance Liquid Chromatography (HPLC) method. Preliminarily, 16 samples of liver and 7 of aqueous humor were processed. Aldicarb was found in seven cases (7/16; 44%): Jaguarundi (n=2), Crab-eating Raccoon (n=1), Puma (n=1), Ocelot (n=1), Manned Wolf (n=1) and Lesser Grison (n=1). According to the samples: aldicarb was found mainly in the liver (6/15, 40%) and then in aqueous humor (1/7; 14%). No samples were positive to carbofuran. The next steps are to finish processing the other samples. Our results demonstrate the presence of aldicarb, a pesticide that is currently banned in Brazil. We hypothesized the presence of aldicarb to three different ways: 1) consumption of poisoned pests; 2) presence of the aldicarb in the environment; and 3) direct poisoning. However, we cannot assess the impacts in terms of health (poisoning, sublethal exposure) of this compound in wild carnivores. In future studies we intend to investigate possible routes of exposure.

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