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Repeatability and correlation of physiological traits: Do ectotherms have a "thermal type"?

Celine T Goulet1, Michael B Thompson2, David G Chapple1

  • 1School of Biological Sciences Monash University Clayton Vic. Australia.

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|January 25, 2017
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Physiological traits in the delicate skink form a thermal behavior syndrome (TBS). Lizards exhibit distinct "thermal types," influencing traits like sprint speed and preferred body temperature for optimal fitness.

Keywords:
individual variationlocomotor performanceselected body temperaturesyndromethermal physiology

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Area of Science:

  • Evolutionary biology
  • Physiological ecology
  • Herpetology

Background:

  • Individuals within species often exhibit correlated traits, known as syndromes.
  • Existing research on syndromes primarily focuses on behavioral and life history traits.
  • It remains unclear if physiological traits also form cohesive syndromes.

Purpose of the Study:

  • To investigate whether physiological traits in the delicate skink (Lampropholis delicata) form a syndrome.
  • To determine if thermal traits exhibit consistent individual variation and across-context correlations.
  • To identify and characterize a potential physiological syndrome related to thermal traits.

Main Methods:

  • Measurement of 10 distinct thermal traits in Lampropholis delicata.
  • Calculation of trait repeatability to assess consistency.
  • Evaluation of across-context correlations among thermal traits.

Main Results:

  • Individual thermal traits demonstrated consistent variation.
  • The measured thermal traits were structured into a physiological syndrome, termed the thermal behavior syndrome (TBS).
  • Lizards were categorized into "thermal types" along a cold-hot continuum, with distinct physiological and behavioral differences.

Conclusions:

  • Physiological traits can form a cohesive evolutionary unit, supporting the concept of a thermal behavior syndrome.
  • The thermal behavior syndrome influences key fitness-related behaviors by linking thermal physiology to performance.
  • This suggests that physiological syndromes may evolve to optimize temperature regulation for maximizing fitness.