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Synergistic effects of a combined exposure to herbicides and an insecticide in Hyla versicolor

January 1, 2003

Combinations of the herbicides atrazine and metolachlor and the insecticide chlorpyrifos were tested under both laboratory and field conditions to determine their individual and combined effects on amphibian populations. In the lab Hyla versicolor tadpoles experienced 100% mortality when exposed to a high combination of the pesticides (2.0 mg/L atrazine, 2.54 mg/L metolachlor, 1.0 mg/L chlorpyrifos) whereas low concentrations of the pesticides (0.2 mg/L atrazine, 0.25 mg/L metolachlor, 0.1 mg/L chlorpyrifos) or high concentrations of either herbicides or insecticide alone caused lethargy, reduced growth and delayed metamorphosis but no significant mortality. In the field high herbicide, low insecticide and low herbicide, low insecticide mixtures significantly reduced amphibian populations compared to controls but in the low herbicide, low insecticide wetlands amphibian populations were able to recover through recruitment by the end of the season.

Citation Information

Publication Year 2003
Title Synergistic effects of a combined exposure to herbicides and an insecticide in Hyla versicolor
DOI
Authors L. Mazanti, D.W. Sparling, C. Rice, K. Bialek, C. Stevenson, B. Teels
Publication Type Conference Paper
Publication Subtype Conference Paper
Series Title
Series Number
Index ID 70025596
Record Source USGS Publications Warehouse
USGS Organization