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Selenium accumulation and elimination in mallards.

G H Heinz1, G W Pendleton, A J Krynitsky

  • 1U.S. Fish and Wildlife Service, Patuxent Wildlife Research Center, Laurel, Maryland 20708.

Archives of Environmental Contamination and Toxicology
|May 1, 1990
PubMed
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Selenium accumulation and loss in mallards (Anas platyrhynchos) show rapid uptake and varying elimination rates in different tissues. Liver and muscle selenium levels equilibrate and deplete at distinct rates, crucial for understanding avian toxicology.

Area of Science:

  • Environmental Toxicology
  • Avian Biology
  • Biogeochemistry

Background:

  • Selenium is an essential trace element but can be toxic at elevated levels.
  • Understanding selenium dynamics in wildlife is crucial for ecological risk assessment.
  • Mallards (Anas platyrhynchos) are common waterfowl often exposed to environmental contaminants.

Purpose of the Study:

  • To quantify selenium accumulation and loss kinetics in adult mallards.
  • To determine tissue-specific differences in selenium uptake and elimination rates.
  • To model selenium dynamics following dietary exposure and withdrawal.

Main Methods:

  • Two experiments involving adult mallards fed selenomethionine at controlled levels.
  • Monitoring selenium concentrations in liver, muscle, blood, and breast tissue over time.

Related Experiment Videos

  • Mathematical modeling (exponential and multi-exponential decay) to describe selenium kinetics.

    • Main Results:

    • Selenium accumulation in female mallard liver and muscle followed predictable patterns.
    • Liver reached 95% selenium equilibrium faster (7.8 days) than muscle (81 days).
    • Selenium elimination half-times varied by tissue: liver (18.7 days), muscle (30.1 days), blood (9.8 days), and complex liver kinetics in Experiment 2.

    Conclusions:

    • Selenium uptake and loss rates differ significantly between mallard tissues.
    • Mathematical models effectively describe selenium dynamics in mallards.
    • Findings provide critical data for assessing selenium risks in waterfowl populations.