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Related Experiment Video

Updated: Jun 11, 2026

Ecotoxicological Methodologies to Evaluate Biomarkers at Different Scales in Neotropical Anurans
08:14

Ecotoxicological Methodologies to Evaluate Biomarkers at Different Scales in Neotropical Anurans

Published on: April 28, 2023

Tissue mercury concentrations and adrenocortical responses of female big brown bats (Eptesicus fuscus) near a

Haruka Wada1, David E Yates, David C Evers

  • 1Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA. hwada@uwo.ca

Ecotoxicology (London, England)
|July 3, 2010
PubMed
Summary

Insectivorous bats near a mercury-contaminated river show elevated mercury levels in blood and fur. However, their adrenocortical responses indicate no adverse effects, suggesting bats can tolerate these mercury exposures.

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Last Updated: Jun 11, 2026

Ecotoxicological Methodologies to Evaluate Biomarkers at Different Scales in Neotropical Anurans
08:14

Ecotoxicological Methodologies to Evaluate Biomarkers at Different Scales in Neotropical Anurans

Published on: April 28, 2023

Area of Science:

  • Environmental toxicology
  • Wildlife ecology
  • Mammalogy

Background:

  • Research on mercury (Hg) in wildlife often overlooks insectivorous terrestrial vertebrates.
  • Emerging evidence suggests insectivorous species may also be vulnerable to mercury contamination.

Purpose of the Study:

  • To assess mercury (Hg) burden and adrenocortical stress responses in insectivorous big brown bats (Eptesicus fuscus).
  • To compare Hg concentrations and stress indicators between bats near a Hg-contaminated river and a reference area.

Main Methods:

  • Examined blood and fur mercury (Hg) concentrations in big brown bats (Eptesicus fuscus).
  • Assessed adrenocortical responses using baseline and handling-induced glucocorticoid levels.
  • Compared bats from a Hg-contaminated site (South River, VA) with a reference site.

Main Results:

  • Bats near the Hg-contaminated site had significantly higher blood (2.6x) and fur (2.6x) Hg concentrations.
  • Fur Hg concentrations were substantially higher than blood Hg, suggesting fur as a depuration route.
  • No significant differences in baseline or stress-induced adrenocortical responses were observed between sites.

Conclusions:

  • Insectivorous bats near the South River, VA, exhibit elevated mercury (Hg) burdens.
  • Despite high Hg levels, bats did not show signs of adrenal stress, indicating tolerance below adverse effect thresholds.
  • Fur may serve as a significant pathway for mercury excretion in bats.