Quantifying the relative importance of survival threats to a long-lived reptile using expert elicitation

Jennifer F. Moore; J. Hardin Waddle; Fred Johnson; Julien Martin; Evan H. Campbell Grant; Jillian E. Fleming; Thomas S. Akre; Donald J. Brown; Yu Man Lee; Jonathon Drescher-Lehman; John Kleopfer; Jessica R. Meck; Kevin J. Oxenrider; Jeff Tamplin; Anthony Tur; Lisabeth L. Willey

doi:10.3354/esr01440

Quantifying the relative importance of survival threats to a long-lived reptile using expert elicitation

Endangered Species Research

By: Jennifer F. Moore, J. Hardin Waddle, Fred Johnson, Julien Martin, Evan H. Campbell Grant, Jillian E. Fleming, Thomas S. Akre, Donald J. Brown, Yu Man Lee, Jonathon Drescher-Lehman, John Kleopfer, Jessica R. Meck, Kevin J. Oxenrider, Jeff Tamplin, Anthony Tur, and Lisabeth L. Willey

https://doi.org/10.3354/esr01440

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Abstract

Long-term survival of a conservation-reliant species requires understanding the impact of threats on population growth rate and the management actions that can help mitigate these threats. We used a threat assessment with expert-elicited estimates to determine the relative effect of each stage-specific threat on the population growth rate of the wood turtle Glyptemys insculpta. In addition, we offered potential management actions that could mitigate these threats and examined the relative cost and benefit of each. The experts responded that predators had the largest effect on hatchling and juvenile survival and that road mortality had the largest effect on adult survival. The population growth rate of the simulated turtle population increased the most when predators were removed from the system, though the population trajectory remained negative. Finally, we found that predator control had the lowest cost:benefit ratio of the proposed management actions. The process used in this analysis of expert elicitation combined with modeling that accounts for uncertainty proved to be a useful technique that is less expensive and labor intensive than empirical studies and quicker to implement, although it relies on sufficient empirical studies to inform expert responses. This process could be replicated for other species to inform species status assessments.

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Additional publication details
Publication type	Article
Publication Subtype	Journal Article
Title	Quantifying the relative importance of survival threats to a long-lived reptile using expert elicitation
Series title	Endangered Species Research
DOI	10.3354/esr01440
Volume	58
Publication Date	September 25, 2025
Year Published	2025
Language	English
Publisher	Inter-Research
Contributing office(s)	Wetland and Aquatic Research Center
Description	12 p.
First page	147
Last page	158
Country	Canada, United States