Synergistic effects of a combined exposure to herbicides and an insecticide in Hyla versicolor
By: L. Mazanti, D. W. Sparling, C. Rice, K. Bialek, C. Stevenson, and B. Teels
Edited by: Linder G.L.Krest S.Sparling D.Little E.E.
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Abstract
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.
Suggested Citation
Mazanti, L., Sparling, D.W., Rice, C., Bialek, K., Stevenson, C., Teels, B., 2003, Synergistic effects of a combined exposure to herbicides and an insecticide in Hyla versicolor, in ASTM Special Technical Publication, no. 1443, Pittsburgh, PA, 16 April 2002 through 17 April 2002, p. 111-129.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Synergistic effects of a combined exposure to herbicides and an insecticide in Hyla versicolor |
| Issue | 1443 |
| Year Published | 2003 |
| Language | English |
| Larger Work Title | ASTM Special Technical Publication |
| First page | 111 |
| Last page | 129 |
| Conference Title | Multiple Stressor Effects in Relation to Declining Amphibian Populations |
| Conference Location | Pittsburgh, PA |
| Conference Date | 16 April 2002 through 17 April 2002 |