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Drop it like it's hot: Interpopulation variation in thermal phenotypes shows counter-gradient pattern.

Mitchell J Hodgson1, Lisa E Schwanz1

  • 1Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, NSW, 2052, Australia.

Journal of Thermal Biology
|July 24, 2019
PubMed
Summary

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High-elevation jacky lizards show higher thermal preferences, contrary to predictions. These differences suggest local adaptation or developmental effects, not recent acclimation, impacting ectotherm populations facing climate change.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Herpetology

Background:

  • Ectotherms rely on behavioral and physiological strategies to manage thermal variations.
  • Climate change necessitates understanding population-level responses to geographic climate variability for persistence.

Purpose of the Study:

  • Investigate local adaptation and acclimation in thermal traits and behaviors of jacky lizards (Amphibolurus muricatus).
  • Determine if observed thermal trait variations are due to acclimation or fixed population differences (developmental plasticity, local adaptation).

Main Methods:

  • Compared thermal preferences and basking behavior of wild and captive jacky lizards from high and low elevation sites.
  • Assessed acclimation responses in captive lizards under different basking regimes.
Keywords:
AcclimationClimate responsesCounter-gradientIntraspecific variationLocal adaptation

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Main Results:

  • High-elevation lizards exhibited higher preferred temperatures and panting thresholds than low-elevation lizards, contradicting initial predictions.
  • No significant differences in basking intensity or duration were observed between elevation groups.
  • Acclimation differences between high- and low-elevation lizards were not significant.
  • Captive lizards under varied basking conditions showed no major differences in thermal traits or behavior.

Conclusions:

  • Findings suggest counter-gradient variation in lizard thermal phenotypes.
  • Results indicate that local adaptive responses or developmental plasticity, rather than recent acclimation, drive these thermal phenotype differences.
  • Understanding these mechanisms is crucial for predicting ectotherm population persistence under climate change.