Abstract
Environmental contamination is reaching ever higher levels and affecting several animal populations, including humans. In this context, studies are being developed to monitor and evaluate this environmental problem using bioindicators organisms, in addition to testing the toxicity of contaminants in the laboratory. In this perspective, reptiles are ideal animals for these types of studies, considering that they are ectothermic and have a slower metabolism directly influencing their recovery power, and therefore, they are more sensitive to xenobiotic effects. Among reptiles, lizards are animals that adapt to various environmental conditions, even being found in areas with arid characteristics. Therefore, a literature review was conducted in this study regarding the use of lizards as models for ecotoxicological studies, including biomonitoring, carried out in the last 10 years, with the aim of evaluating them as bioindicators in Brazilian semi-arid region. Studies were found involving ten lizard families, among which the most investigated was Lacertidae. The studies were classified into two categories: organic contaminants (pesticides, petroleum by-products, and explosives) and inorganic contaminants (metals such as zinc, lead and aluminum, and radionuclides). Contaminants directly contributed to DNA damage and to increasing the frequency of micronuclei in exposed animals, histopathological effects, and oxidative stress. The performed analysis highlights the usefulness of lizards as environmental biomonitors. However, the response profile is dependent on the exposure level and route, in addition to the environmental scenario analyzed. Therefore, future studies aimed at evaluating environmental contaminants are required under exposure conditions more related to the environmental reality to be studied.
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Funding
This study was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/437719/2018-9) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) through the scholarship granted numbers 313661/2017-0 (EMXF_CNPq) and 8888375327/2019-01(JMS), respectively.
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Silva, J.M., Navoni, J.A. & Freire, E.M.X. Lizards as model organisms to evaluate environmental contamination and biomonitoring. Environ Monit Assess 192, 454 (2020). https://doi.org/10.1007/s10661-020-08435-7
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DOI: https://doi.org/10.1007/s10661-020-08435-7