2014/01/15 by Martha M. Muñoz, Maureen A. Stimola, Adam C. Algar +5 · 2 citations
Environmental Science · Agricultural and Biological Sciences · #Amphibian and Reptile Biology #Animal Behavior and Reproduction #Species Distribution and Climate Change #Thermoregulation #Biology #Anolis #Adaptation (eye) #Ecology #Context (archaeology) #Ectotherm #Evolutionary physiology #Lizard #Tropical climate #Iguanidae #Habitat #Phenotypic plasticity #Natural selection #Selection (genetic algorithm) #Sauria #Evolutionary ecology
paper · pdf · doi:10.1098/rspb.2013.2433
openalex publication_date 2014/01/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
Understanding how quickly physiological traits evolve is a topic of great interest, particularly in the context of how organisms can adapt in response to climate warming. Adjustment to novel thermal habitats may occur either through behavioural adjustments, physiological adaptation or both. Here, we test whether rates of evolution differ among physiological traits in the cybotoids, a clade of tropical Anolis lizards distributed in markedly different thermal environments on the Caribbean island of Hispaniola. We find that cold tolerance evolves considerably faster than heat tolerance, a difference that results because behavioural thermoregulation more effectively shields these organisms from selection on upper than lower temperature tolerances. Specifically, because lizards in very different environments behaviourally thermoregulate during the day to similar body temperatures, divergent selection on body temperature and heat tolerance is precluded, whereas night-time temperatures can only be partially buffered by behaviour, thereby exposing organisms to selection on cold tolerance. We discuss how exposure to selection on physiology influences divergence among tropical organisms and its implications for adaptive evolutionary response to climate warming.