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Related Experiment Videos

Thermal tolerance, climatic variability and latitude.

A Addo-Bediako1, S L Chown, K J Gaston

  • 1Department of Zoology and Entomology, University of Pretoria, South Africa.

Proceedings. Biological Sciences
|May 20, 2000
PubMed
Summary
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Species physiological tolerances vary with latitude, supporting Rapoport's rule. Lower lethal temperatures decrease at higher latitudes, but upper limits do not, increasing variation in thermal tolerance with latitude.

Area of Science:

  • Ecology
  • Physiology
  • Biogeography

Background:

  • Species occurrence and distribution are influenced by physiological tolerances.
  • Rapoport's rule suggests physiological tolerances broaden with latitude due to increased climatic variation.
  • Empirical data on species' physiological tolerances across latitudinal gradients are limited.

Purpose of the Study:

  • To assess insect physiological tolerances across latitudinal gradients.
  • To test the assumption of broadening physiological tolerances with latitude.
  • To evaluate the relationship between physiological limits and climatic variation.

Main Methods:

  • Compiled published data on upper and lower lethal temperatures for insects.
  • Analyzed geographical variation in thermal limits.

Related Experiment Videos

  • Examined trends in supercooling points and lethal temperatures with latitude.

    • Main Results:

    • Upper thermal limits showed minimal geographical variation.
    • Lower bounds of supercooling points and lower lethal temperatures decreased with increasing latitude.
    • Upper bounds of lethal temperatures did not show a consistent latitudinal trend, increasing variation in lower lethal limits.

    Conclusions:

    • Findings provide partial support for the physiological tolerance component of Rapoport's rule.
    • The study highlights the need for integrated data on species tolerances and range sizes.
    • Geographical variation in lower lethal temperatures, but not upper limits, influences latitudinal distribution patterns.