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Upper thermal limits are repeatable in Trinidadian guppies.

Rollie M Grinder1, Ronald D Bassar1, Sonya K Auer1

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Repeatability of critical thermal maximum (CTmax) in guppies was moderate. Repeated heat exposure, or heat hardening, increased guppy thermal tolerance over time.

Keywords:
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Area of Science:

  • Physiology
  • Ecology
  • Climate Change Biology

Background:

  • Predicting species vulnerability to climate change requires understanding thermal tolerance.
  • The repeatability of critical thermal maximum (CTmax) within individuals is not well-established.

Purpose of the Study:

  • To assess the repeatability of CTmax in Trinidadian guppies (Poecilia reticulata) over multiple trials.
  • To investigate changes in thermal tolerance following repeated exposure to extreme heat.

Main Methods:

  • CTmax was measured for individual guppies across six weekly trials.
  • Statistical analysis was used to determine the repeatability of CTmax measurements.

Main Results:

  • The repeatability of CTmax across six trials was 0.43.
  • CTmax increased by 0.6°C across the first four trials, indicating an acclimation response.
  • Thermal tolerance stabilized after the initial four trials.

Conclusions:

  • CTmax exhibits moderate repeatability in guppies.
  • Repeated exposure to high temperatures can lead to heat hardening, increasing thermal tolerance.
  • Findings suggest that species may acclimate to warming environments through physiological adjustments.