Kangaroo rats change temperature when investigating rattlesnake predators

Area of Science:

• Behavioral Ecology
• Physiological Ecology
• Thermoregulation

Background:

• Predator presence triggers acute stress responses in prey animals, enhancing survival through physiological and behavioral adaptations.
• Stress responses can alter body surface temperatures, potentially signaling prey state to predators with thermal sensing capabilities.
• Pit vipers, like rattlesnakes, possess heat-sensing organs that could detect such temperature changes.

Purpose of the Study:

• To investigate if wild rodents exhibit stress-induced changes in body surface temperature when encountering rattlesnake predators.
• To determine if predator detection by prey leads to detectable thermal signature alterations.

Main Methods:

• Staged encounters between Merriam's kangaroo rats (Dipodomys merriami) and Mojave rattlesnakes (Crotalus scutulatus).
• Utilized thermal-imaging cameras to record interactions at baited feeding stations.
• Analyzed changes in prey body surface temperatures during predator interactions.

Main Results:

• Kangaroo rats displayed significant changes in maximum head, snout, and hind leg temperatures during interactions with rattlesnakes.
• These findings support the hypothesis that predator presence induces body temperature modifications in prey.
• The study observed a stress-induced thermal response in prey animals.

Conclusions:

• Predator-induced stress demonstrably alters prey body surface temperature in wild rodents.
• Potential implications for predator-prey dynamics, where heat-sensing predators might use thermal cues to assess prey vigilance.
• Further research is needed on rattlesnake pit organ function in field conditions to confirm the use of these thermal signals.