How to avoid errors when quantifying thermal environments

George S. Bakken, Michael Angilletta

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Modelling thermal environments at high resolution becomes simpler when using operative temperature, which condenses microclimate and morphology into an index of thermal stress. Operative temperature can be mapped using large numbers of 'operative temperature thermometers', hollow models that duplicate external properties of the animal. As climatologists predict that air will warm by 2-4 °C by 2100, biologists must be able to distinguish climate change from systematic errors in operative temperature of the same magnitude. A systematic error in operative temperature of 2 °C or a similar amount of climate warming can change predicted surface activity and indices of habitat quality, thermoregulatory precision and predation risk by 5-12%, and in some cases more than 30%. As construction details of operative temperature thermometers can affect their accuracy by 2 °C or more, biologists should use detailed physical models calibrated against living animals over potential ranges of postures, orientations and microclimates. Water-filled models do not measure operative temperature correctly, fail to capture thermal extremes and are an unnecessary complication as one can easily compute the body temperature of moving or stationary animals from body mass and the spatio-temporal distribution of operative temperatures.

Original languageEnglish (US)
Pages (from-to)96-107
Number of pages12
JournalFunctional Ecology
Volume28
Issue number1
DOIs
StatePublished - Feb 2014

Fingerprint

heat
temperature
thermometers
microclimate
biologists
animal
animals
physical models
posture
thermal stress
body temperature
predation risk
habitat quality
temporal distribution
body mass
global warming
warming
climate change
predation
air

Keywords

  • Climate change
  • Microclimate
  • Operative temperature
  • Operative temperature thermometer
  • Thermal heterogeneity
  • Thermal map
  • Thermoregulation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

How to avoid errors when quantifying thermal environments. / Bakken, George S.; Angilletta, Michael.

In: Functional Ecology, Vol. 28, No. 1, 02.2014, p. 96-107.

Research output: Contribution to journalArticle

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