Journal
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
Volume 281, Issue 1778, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rspb.2013.2433
Keywords
thermoregulation; thermal physiology; physiological evolution; Anolis lizards; Bogert effect
Categories
Funding
- National Science Foundation grant (DEB) [0918975]
- NSF Graduate Research Fellowship
- Putnam Expedition grant
- Craig Family Award
- Division Of Environmental Biology
- Direct For Biological Sciences [0918975] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [1210293] Funding Source: National Science Foundation
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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
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