Do ring-necked snakes choose retreat sites based upon thermal preferences?

Area of Science:

• Ecology
• Physiology
• Herpetology

Background:

• Biochemical reaction rates in ectotherms are temperature-dependent, necessitating microhabitat selection for physiological function.
• Previous research on squamate reptiles suggests retreat site selection aids in maintaining optimal body temperatures, but with limited scope.

Purpose of the Study:

• To investigate retreat site selection in ring-necked snakes (Diadophis punctatus) concerning physiological thermal preferences and tolerances.
• To test if field body temperatures align with laboratory-measured thermal preferences in this semifossorial reptile.

Main Methods:

• Measured environmental temperatures of retreat sites and field body temperatures of ring-necked snakes.
• Determined snakes' thermal preferences, upper voluntary temperature, and critical thermal minima in laboratory settings.

Main Results:

• Ring-necked snakes were found under larger, warmer rocks.
• Field body temperatures did not consistently match laboratory-determined thermal preferences.
• Aggregated snakes selected sites with temperatures 3°C higher than preferred, while solitary snakes maintained near-preferred temperatures.

Conclusions:

• Thermal considerations in retreat-site selection show significant within- and among-species variation.
• Organisms navigate complex trade-offs between physiological needs and ecological requirements in heterogeneous environments.