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Oviposition site selection: pesticide avoidance by gray treefrogs.

Mizuki Takahashi1

  • 1Department of Biology, University of Memphis, Memphis, Tennessee 38152, USA. mtakahsh@memphis.edu

Environmental Toxicology and Chemistry
|August 2, 2007
PubMed
Summary
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Gray treefrogs avoid laying eggs in water containing glyphosate herbicides, even when combined with predator cues. This suggests amphibians may select safer breeding sites to protect offspring from herbicide exposure.

Area of Science:

  • Environmental Toxicology
  • Amphibian Ecology
  • Ecotoxicology

Background:

  • Glyphosate herbicides impact non-target organisms, yet their effect on amphibian oviposition site selection is unknown.
  • Previous research shows pesticide and predator cues increase tadpole mortality.
  • Amphibian breeding site selection is crucial for offspring survival.

Purpose of the Study:

  • To investigate if adult gray treefrogs avoid oviposition sites containing glyphosate (Roundup).
  • To determine if avoidance behavior is amplified by the presence of predatory cues.
  • To assess the impact of herbicide concentration on amphibian reproductive decisions.

Main Methods:

  • An outdoor experiment utilized artificial ponds with four treatments: predatory fish cue, Roundup (2.4 mg glyphosate acid equivalent/L), combined cue and Roundup, and a control.

Related Experiment Videos

  • Oviposition site choice was assessed by quantifying the number of gray treefrog egg masses laid in each treatment.
  • The study focused on behavioral responses of adult amphibians to environmental contaminants.

    • Main Results:

    • Gray treefrogs significantly avoided oviposition in pools treated with Roundup and/or predatory fish cues.
    • The majority of eggs were laid in control pools, indicating a preference for uncontaminated sites.
    • Avoidance behavior was observed even when herbicide was present alone.

    Conclusions:

    • Adult gray treefrogs demonstrate avoidance of glyphosate-contaminated oviposition sites, potentially protecting offspring from lethal herbicide exposure.
    • This study provides the first evidence that environmentally relevant concentrations of herbicides can alter amphibian oviposition site selection.
    • Further research is critical to determine the ecological relevance of these findings given field concentration variability.