Activity and Behavior of the Sonoran Desert Tortoise in Arizona

Averill‐Murray, Roy C.; Martin, Brent E.; Bailey, Scott J.; Wirt, Elizabeth B.

doi:10.2307/j.ctvfjcx1x.10

Cited by 3 publications

(1 citation statement)

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“…Despite being herbivorous, they spend little time active on the surface. For example, tortoises in the Sonoran and Mojave deserts hibernate over 100 days per year (Averill-Murray et al, 2002), although there are records of more than 200 days (Bailey et al, 1995). In addition, Gopherus tortoises spend considerable time inside burrows during their activity season (late spring, summer and fall).…”

Section: Introductionmentioning

confidence: 99%

Micro and macroclimatic constraints on the activity of a vulnerable tortoise: A mechanistic approach under a thermal niche view

et al. 2022

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1. Thermal constraints imposed by the environment limit the activity time of ectotherms and have been a central issue in ecophysiology. Assessing these restrictions is key to determining the vulnerability of species to changing thermal niches and developing conservation strategies.2. We generate an explicit tortoise model of thermal constraints at both micro and macroclimate scales based on thermophysiology parameters and environmental operative temperatures during a biologically significant period. As a study model, we use a vulnerable species of gopher tortoise Gopherus evgoodei, whose primary habitat is the tropical dry forests in northwestern Mexico.3. Our mechanistic model is based on a monitoring of 5 years of environmental operative temperatures (T e ). Here, we use the hours of activity (h a ) and hours of thermal restriction (h r ), calculated from the voluntary temperature range of G. evgoodei with respect to T e , to project and compare the thermal constraints across space and time. In addition, this model was projected using a pessimistic climate change scenario for 2070 (RCP 8.5).4. The results show that the period of activity of G. evgoodei, predicted by h a and h r , is limited by the frequency and availability of T e and differs significantly throughout the year and among years. In addition, under the RCP 8.5 scenario, we predict that h r will increase considerably and exceed the critical value (3.1 h r ) placing this species as highly vulnerable. 5. We discuss and compare the period of potential activity, thermoregulation strategies, and costs and benefits with other Gopherus species. Finally, we identify critical areas throughout its range to develop management strategies for protecting this Mexican endemic tortoise.

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Section: Introductionmentioning

confidence: 99%