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Assessment of antioxidant system, cholinesterase activity and histopathology in Lithobates catesbeianus tadpoles exposed to water from an urban stream

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Abstract

Anthropogenic activities promote changes in community structure and decrease the species abundance of amphibians. The aim of this study was to assess potential alterations in the antioxidant system and cholinesterase activity, histopathological and oxidative damage in Lithobates catesbeianus tadpoles exposed to water from the Cascavel River, in Southern Brazil. Water samples (140 L each) were collected from the headwater, urban and rural areas of the river. Tadpoles were acclimated for seven days. After acclimatization tadpoles were reared in water from the river, except for the control aquarium. After seven days, a portion of the liver was removed and prepared for cholinesterase (ChE), superoxide dismutase (SOD), catalase (CAT) and lipid peroxidation (LPO) analysis; another part of the tissue was prepared for histological examination. An elevation of CAT activity was observed for water from both urban and rural environments. A decrease in LPO reaction was detected, mainly among the tadpoles exposed to water from the rural area. These alternations can cause delay the metamorphosis and lead to metabolic dysfunction, interfering in survival capacity and diminishing, not only individual fitness, but that of the whole population.

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Acknowledgements

We thank the State University of the West of Paraná for enabling us to carry out this study.

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Correspondence to Thaís Maylin Sobjak.

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The authors declare that they have no conflict of interest.

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All applicable national (CONCEA—https://www.mctic.gov.br/mctic/opencms/institucional/concea/paginas/concea.html) and institutional guidelines for the care and use of animals were followed. The CEUA Certificate of Approval was issued under number 30-18.

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Boiarski, D.R., Toigo, C.M., Sobjak, T.M. et al. Assessment of antioxidant system, cholinesterase activity and histopathology in Lithobates catesbeianus tadpoles exposed to water from an urban stream. Ecotoxicology 29, 314–326 (2020). https://doi.org/10.1007/s10646-020-02176-6

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  • DOI: https://doi.org/10.1007/s10646-020-02176-6

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