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Toxicity of selenium to developing Xenopus laevis embryos.
Journal of Toxicology and Environmental Health
|July 1, 1979
Summary
Sodium selenite is toxic to Xenopus laevis embryos and tadpoles, causing developmental issues and death at low concentrations. Selenium accumulates in tissues, posing a threat to aquatic life.
Area of Science:
- Environmental toxicology
- Developmental biology
- Aquatic ecotoxicology
Background:
- Selenium (Se) is an essential trace element but can be toxic at elevated levels.
- Aquatic ecosystems are vulnerable to selenium contamination from anthropogenic sources.
Purpose of the Study:
- To investigate the toxicity of sodium selenite to Xenopus laevis embryos and tadpoles.
- To assess selenium uptake, depuration, and developmental effects in aquatic amphibians.
Main Methods:
- Continuous exposure of Xenopus laevis embryos and tadpoles to varying concentrations of sodium selenite.
- Monitoring of developmental abnormalities, mortality rates, and radioactive selenium uptake and loss.
Main Results:
- Sodium selenite exhibited toxicity to Xenopus laevis at concentrations above 1 ppm.
- Concentrations of 2 ppm and higher led to severe developmental abnormalities and increased mortality.
- Selenium uptake from water was rapid, with incomplete depuration, indicating bioaccumulation.
Conclusions:
- Xenopus laevis embryos and tadpoles are sensitive to low levels of selenium.
- Selenium exposure can cause significant developmental abnormalities and mortality in aquatic amphibians.
- The bioaccumulation of selenium in aquatic organisms highlights environmental risks associated with increased selenium release.