Refuge use: a conflict between avoiding predation and losing mass in lizards

Area of Science:

• Ecology
• Behavioral Ecology
• Herpetology

Background:

• Prey often increase refuge use in response to predation risk, potentially leading to reduced body condition.
• The specific factors causing this body condition loss and how prey mitigate these costs are not well understood.
• Initial body condition's influence on refuge use strategies is also largely unknown.

Purpose of the Study:

• To investigate how Iberolacerta cyreni lizards modify escape strategies and refuge use in response to varying predation risks (habitat deterioration, ecotourism).
• To determine the consequences of these behavioral adjustments on lizard body condition.
• To identify the specific costs associated with refuge use that impact body condition.

Main Methods:

• Field observations of Iberolacerta cyreni in areas with differing predation risks.
• Laboratory experiments to assess the impact of refuge temperature and food availability on lizard body condition.
• Analysis of lizard behavior (refuge proximity, time spent hidden) and body condition metrics.

Main Results:

• Lizards in high-risk areas stayed closer to refuges but reduced time hidden post-attack, likely to maintain body condition.
• Refuge use incurs costs to body condition primarily through reduced food intake, not impaired digestion.
• Lizards adjusted refuge use based on their body condition, with poorer-conditioned individuals spending less time hidden.

Conclusions:

• Iberolacerta cyreni exhibits flexible antipredator strategies to manage predation risk without compromising body condition.
• Behavioral adjustments in refuge use are key to balancing predation avoidance and physiological costs.
• Understanding these adaptive strategies is crucial for predicting prey population dynamics under varying environmental pressures.