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Acetaminophen and zinc phosphide for lethal management of invasive lizards Ctenosaura similis

M. Avery,J. Eisemann,K. L. Keacher,P. Savarie

Published 2011 in Current Zoology

ABSTRACT

Reducing populations of invasive lizards through trapping and shooting is feasible in many cases but effective inte- grated management relies on a variety of tools, including toxicants. In Florida, using wild-caught non-native black spiny-tailed iguanas Ctenosaura similis, we screened acetaminophen and zinc phosphide to determine their suitability for effective population management of this prolific invasive species. Of the animals that received acetaminophen, none died except at the highest test dose, 240 mg per lizard, which is not practical for field use. Zinc phosphide produced 100% mortality at dose levels as little as 25 mg per lizard, equivalent to about 0.5% in bait which is lower than currently used in commercial baits for commensal rodent con- trol. We conclude that zinc phosphide has potential as a useful tool for reducing populations of invasive lizards such as the black spiny-tailed iguana provided target-selective delivery methods are developed (Current Zoology 57 (5): 625-629, 2011). Keywords Acetaminophen, Black spiny-tailed iguana, Ctenosaura similis, Florida, Invasive, Zinc phosphide

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