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Physiological and behavioral variation in estivation among mud turtles (Kinosternon spp.)
Day B Ligon1, Charles C Peterson
1Department of Zoology, 430 Life Sciences West, Oklahoma State University, Stillwater, Oklahoma 74078-3052, USA. lday@okstate.edu
Physiological and Biochemical Zoology : PBZ
|August 15, 2002
Summary
Desert mud turtles show varied responses to dry conditions. Behavioral adaptations, not metabolic changes, are key to estivation success in Kinosternon species.
Area of Science:
- Herpetology
- Desert Ecology
- Physiological Ecology
Background:
- Kinosternid mud turtles are primarily aquatic but display terrestrial activity.
- Desert environments pose significant challenges due to arid conditions.
Purpose of the Study:
- To compare behavioral and physiological adaptations to simulated dry seasons in four mud turtle populations.
- To identify factors influencing estivation capacity in Kinosternon species.
Main Methods:
- Laboratory simulation of dry season conditions.
- Monitoring of turtle activity levels.
- Measurement of physiological parameters: blood chemistry, resting metabolism, and evaporative water loss.
Main Results:
- Kinosternon flavescens and K. hirtipes showed extreme differences in estivation ability.
- Two K. sonoriense populations exhibited environment-specific adaptations.
- K. sonoriense (Arizona) and K. hirtipes required rehydration after 30 days.
- K. flavescens had the lowest metabolic rates; no metabolic depression was observed.
Conclusions:
- Estivation capacity in mud turtles is mainly driven by behavioral responses to aridity.
- High evaporative water loss in K. hirtipes may be a physiological limitation to estivation.
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