Metamorphic acceleration following the exposure to lithium and selenium on American bullfrog tadpoles (Lithobates catesbeianus)
To regulate the presence of contaminants in Brazilian water, the Brazilian Environmental Council (CONAMA) promulgates regulations regarding the concentrations of given compounds that are supposed to be safe for aquatic life. Considering these regulations, this study tested the effects of considered...
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doaj-d3c3d61bb08140b0b1bbc5d253f155e82021-04-23T06:13:25ZengElsevierEcotoxicology and Environmental Safety0147-65132021-01-01207111101Metamorphic acceleration following the exposure to lithium and selenium on American bullfrog tadpoles (Lithobates catesbeianus)Felipe Augusto Pinto Vidal0Fábio Camargo Abdalla1Cleoni dos Santos Carvalho2Heidi Samantha Moraes Utsunomiya3Leonardo Antônio Teixeira Oliveira4Raquel Fernanda Salla5Monica Jones-Costa6Laboratory of Conservation Physiology (LaFisC), Federal University of São Carlos, Brazil; Graduate Program of Biotechnology and Environmental Monitoring, Federal University of SãoCarlos, BrazilLaboratory of Structural and Functional Biology (LaBEF), Federal University of São Carlos, BrazilLaboratory of Biochemistry and Microbiology (LaBioM), Federal University of São Carlos, BrazilLaboratory of Biochemistry and Microbiology (LaBioM), Federal University of São Carlos, BrazilLaboratory of Conservation Physiology (LaFisC), Federal University of São Carlos, BrazilLaboratory of Natural History of Brazilian Amphibians (LaHNAB), State University of Campinas, BrazilLaboratory of Conservation Physiology (LaFisC), Federal University of São Carlos, Brazil; Corresponding author. Department of Biology, Laboratory of Physiology Conservation (LaFisC), Federal University of Sao Carlos, Federal University of São Carlos, UFSCar, Campus Sorocaba, Brazil, Address: João Leme dos Santos Road, Km110 – SP-264, Itinga, Sorocaba-SP, 18052-780, Brazil.To regulate the presence of contaminants in Brazilian water, the Brazilian Environmental Council (CONAMA) promulgates regulations regarding the concentrations of given compounds that are supposed to be safe for aquatic life. Considering these regulations, this study tested the effects of considered safe levels of lithium (2.5 mgL−1) and selenium (0.01 mgL−1), isolated and mixed, on the American bullfrog (Lithobates catesbeianus) tadpoles. The evaluation was done through the use of biomarkers of larval development as total wet weight (TWW), snout-vent-length (SVL), hind-limb-length (HLL), activity level (AL), histologic evaluation of the thyroid gland and the mortality rate. The tadpoles were allocated into four groups (n = 20 each): a control group (CT); a group exposed to lithium (LI), a group exposed to selenium (SE), and a group exposed to both lithium and selenium (SELI). The whole assay was carried out over 21 days, with two rounds of data collection (on 7th and 21st day) to evaluate the responses over time. A statistical reduction in the AL was observed in the tadpoles from the LI and SELI groups after 7 days of exposure, the same pattern was observed after 21 days. Histological analyses of the thyroid gland showed signs of up-regulation (i.e. statistic reduction in number and area of the follicles, as well a significant reduction in the area of the gland) in all exposed groups, which represents an endocrine response as an adaptative strategy to deal with polluted aquatic environment. The stress triggered by the polluted medium is discussed.http://www.sciencedirect.com/science/article/pii/S0147651320309404MetamorphosisAquatic ecotoxicologyAmphibiansLithiumSelenium |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Felipe Augusto Pinto Vidal Fábio Camargo Abdalla Cleoni dos Santos Carvalho Heidi Samantha Moraes Utsunomiya Leonardo Antônio Teixeira Oliveira Raquel Fernanda Salla Monica Jones-Costa |
spellingShingle |
Felipe Augusto Pinto Vidal Fábio Camargo Abdalla Cleoni dos Santos Carvalho Heidi Samantha Moraes Utsunomiya Leonardo Antônio Teixeira Oliveira Raquel Fernanda Salla Monica Jones-Costa Metamorphic acceleration following the exposure to lithium and selenium on American bullfrog tadpoles (Lithobates catesbeianus) Ecotoxicology and Environmental Safety Metamorphosis Aquatic ecotoxicology Amphibians Lithium Selenium |
author_facet |
Felipe Augusto Pinto Vidal Fábio Camargo Abdalla Cleoni dos Santos Carvalho Heidi Samantha Moraes Utsunomiya Leonardo Antônio Teixeira Oliveira Raquel Fernanda Salla Monica Jones-Costa |
author_sort |
Felipe Augusto Pinto Vidal |
title |
Metamorphic acceleration following the exposure to lithium and selenium on American bullfrog tadpoles (Lithobates catesbeianus) |
title_short |
Metamorphic acceleration following the exposure to lithium and selenium on American bullfrog tadpoles (Lithobates catesbeianus) |
title_full |
Metamorphic acceleration following the exposure to lithium and selenium on American bullfrog tadpoles (Lithobates catesbeianus) |
title_fullStr |
Metamorphic acceleration following the exposure to lithium and selenium on American bullfrog tadpoles (Lithobates catesbeianus) |
title_full_unstemmed |
Metamorphic acceleration following the exposure to lithium and selenium on American bullfrog tadpoles (Lithobates catesbeianus) |
title_sort |
metamorphic acceleration following the exposure to lithium and selenium on american bullfrog tadpoles (lithobates catesbeianus) |
publisher |
Elsevier |
series |
Ecotoxicology and Environmental Safety |
issn |
0147-6513 |
publishDate |
2021-01-01 |
description |
To regulate the presence of contaminants in Brazilian water, the Brazilian Environmental Council (CONAMA) promulgates regulations regarding the concentrations of given compounds that are supposed to be safe for aquatic life. Considering these regulations, this study tested the effects of considered safe levels of lithium (2.5 mgL−1) and selenium (0.01 mgL−1), isolated and mixed, on the American bullfrog (Lithobates catesbeianus) tadpoles. The evaluation was done through the use of biomarkers of larval development as total wet weight (TWW), snout-vent-length (SVL), hind-limb-length (HLL), activity level (AL), histologic evaluation of the thyroid gland and the mortality rate. The tadpoles were allocated into four groups (n = 20 each): a control group (CT); a group exposed to lithium (LI), a group exposed to selenium (SE), and a group exposed to both lithium and selenium (SELI). The whole assay was carried out over 21 days, with two rounds of data collection (on 7th and 21st day) to evaluate the responses over time. A statistical reduction in the AL was observed in the tadpoles from the LI and SELI groups after 7 days of exposure, the same pattern was observed after 21 days. Histological analyses of the thyroid gland showed signs of up-regulation (i.e. statistic reduction in number and area of the follicles, as well a significant reduction in the area of the gland) in all exposed groups, which represents an endocrine response as an adaptative strategy to deal with polluted aquatic environment. The stress triggered by the polluted medium is discussed. |
topic |
Metamorphosis Aquatic ecotoxicology Amphibians Lithium Selenium |
url |
http://www.sciencedirect.com/science/article/pii/S0147651320309404 |
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