Thermodynamic effects on the evolution of performance curves

Dee A. Asbury, Michael Angilletta

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Models of thermal adaptation assume that warmadapted and cold-adapted organisms can achieve the same fitness, yet recent comparative studies suggest that warm-adapted organisms outperform cold-adapted ones. We explored how this thermodynamic effect on performance might influence selective pressures on thermal physiology. In the absence of a thermodynamic effect, natural selection favors a thermal optimum for performance that closely matches the mean (or modal) body temperature. When warmadapted organisms outperform cold-adapted organisms, natural selection can favor a thermal optimum that exceeds the mean body temperature. The optimal mismatch between the thermal optimum and the mean temperature increases as does the variation in body temperature within generations. This result holds regardless of whether performance affects fitness through fecundity or survivorship. The selective pressures generated by a thermodynamic effect might explain the substantial mismatch between thermoregulatory behavior and thermal physiology that has been observed in some species.

Original languageEnglish (US)
JournalAmerican Naturalist
Volume176
Issue number2
DOIs
StatePublished - Aug 2010

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Thermodynamics
thermodynamics
body temperature
Hot Temperature
heat
Body Temperature
natural selection
Genetic Selection
physiology
fitness
organisms
survivorship
fecundity
comparative study
Fertility
organism
effect
survival rate
Temperature
cold

Keywords

  • Heterogeneity
  • Performance
  • Temperature
  • Thermodynamics

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Medicine(all)

Cite this

Thermodynamic effects on the evolution of performance curves. / Asbury, Dee A.; Angilletta, Michael.

In: American Naturalist, Vol. 176, No. 2, 08.2010.

Research output: Contribution to journalArticle

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