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Toxicity of glyphosate as Glypro® and LI700 to red‐eared slider (Trachemys scripta elegans) embryos and early hatchlings Get access Donald W. Sparling ,Cooperative Wildlife Research Laboratory, Department of Zoology, and Center for Ecology, LS II, MS6504, Southern Illinois University, Carbondale, Illinois 62901, USA
Cooperative Wildlife Research Laboratory, Department of Zoology, and Center for Ecology, LS II, MS6504, Southern Illinois University, Carbondale, Illinois 62901, USA
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Cole Matson ,Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, Texas 77843, USA
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John Bickham ,Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, Texas 77843, USA
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Paige Doelling‐BrownU.S. Fish and Wildlife Service, 177 Admiral Cochrane Road, Annapolis, Maryland 21401
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Published:
01 October 2006
Revision received:
09 December 2009
Donald W. Sparling, Cole Matson, John Bickham, Paige Doelling‐Brown, Toxicity of glyphosate as Glypro® and LI700 to red‐eared slider (Trachemys scripta elegans) embryos and early hatchlings, Environmental Toxicology and Chemistry, Volume 25, Issue 10, 1 October 2006, Pages 2768–2774, https://doi.org/10.1897/05-152.1
CloseMore than 8.2 billion ha of cropland, gardens, and forests are treated with the herbicide glyphosate each year. Whereas the toxicity of glyphosate and associated adjuvants has been measured in other vertebrates, few, if any, studies have looked at their effects in reptiles. In some instances, management of turtle habitat requires control of successional stages through application of herbicides. Adults and juvenile turtles may be exposed directly, whereas embryos may contact the chemicals through the soil. In the present study, we exposed eggs of red‐eared sliders (Trachemys scripta elegans) to single applications of herbicide ranging from 0 to 11,206 ppm wet weight of glyphosate in Glypro® and 0 to 678 ppm of the surfactant, LI700. Hatching success at the highest concentration was significantly lower (73%) than in other treatments (80–100%). At hatch, turtles at the highest concentration weighed less than those at other concentrations. During a 14‐d holding period, we observed dose–response relationships in the ability of hatchlings to right themselves when turned on their backs. At the end of the holding period, hatchlings at the highest dose level were still lighter, and somatic indices were lower, than those in other treatments. Genetic damage, as measured by flow cytometry, increased with treatment concentration except for the highest dose. We conclude that because of the high concentrations needed to produce effects and the protection offered by several centimeters of soil or sediment, glyphosate with LI700 poses low levels of risk to red‐eared slider embryos under normal field operations with regards to the endpoints measured in the present study. Carelessness in handling glyphosate or failure to follow label directions may produce adverse effects. There also is a risk that the health of turtle embryos may be affected in ways not measured in the present study.
Copyright © 2006 SETAC
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