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Environmental Science and Pollution Research

, Volume 26, Issue 31, pp 31717–31729 | Cite as

Evaluating methods to detect and monitor populations of a large invasive lizard: the Argentine giant tegu

  • Richard M. EngemanEmail author
  • Bernard W. Kaiser
  • Kimberly J. Osorio
Research Article
  • 107 Downloads

Abstract

The Argentine giant tegu, a large lizard native to South America, was first discovered as established in the USA in scrub habitats of west-central Florida in 2006. Invasive populations potentially could occupy an extensive range of habitats and in much of the southern United States and Mexico and threaten many native species. The Argentine giant tegu was recently deemed as having a “highest impact concern” among the invasive reptile species most threatening to Florida ecology. Among the most rewarding research directions identified for this species was “having a reliable and practical method to detect/monitor” them. We address this need by evaluating five methods for monitoring Argentine giant tegus on how well each method detected the species and whether the observations were sufficient to quantitatively assess population abundance using a widely applicable framework for indexing animal populations. Passive tracking plots were the most efficient and effective means for detecting tegus and calculating abundance indices but were best suited for late winter to spring before summer rains compacted tracking substrates. Gopher tortoise burrows are often used by tegus and camera traps on their entrances proved able to obtain data suitable for indexing populations but required more labor and expense than tracking plots. Trapping either at gopher tortoise burrows or along drift fences was ineffective at capturing tegus. Similarly, visual encounter transects were not effective for observing tegus.

Keywords

Camera trap Drift fence Population index Tracking plot Trap testing Visual encounter survey 

Notes

Acknowledgments

This research was supported by the intramural research program of the U.S. Department of Agriculture; Hillsborough County Conservation and Environmental Lands Management Department; partial funding for this project was provided through Cooperative Agreement No. 40181AJ085 between Hillsborough County Conservation and Environmental Lands Management Department and the U.S. Fish and Wildlife Service.

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Copyright information

© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2019

Authors and Affiliations

  • Richard M. Engeman
    • 1
    Email author
  • Bernard W. Kaiser
    • 2
  • Kimberly J. Osorio
    • 2
  1. 1.National Wildlife Research CenterFort CollinsUSA
  2. 2.Hillsborough Parks, Recreation and Conservation DepartmentRiverviewUSA

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