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Related Concept Videos

Global Climate Change01:50

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Requirements for Human Life01:26

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Related Experiment Video

Updated: May 11, 2026

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
07:54

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Published on: March 9, 2021

Temperature variation makes ectotherms more sensitive to climate change.

Krijn P Paaijmans1, Rebecca L Heinig, Rebecca A Seliga

  • 1Department of Entomology, The Pennsylvania State University, University Park, PA 16802, USA. krijn@paaijmans.nl

Global Change Biology
|May 1, 2013
PubMed
Summary
This summary is machine-generated.

Daily temperature fluctuations significantly impact ectotherm fitness norms, altering their response to climate warming. This research highlights how these dynamics reduce thermal safety margins for insects, a crucial factor often overlooked in climate change studies.

Keywords:
Anopheles stephensiJensen's inequalityclimate changeconservationdiurnal temperature fluctuationectotherm fitnessthermal fitness curvethermal reaction norm

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Physiological Ecology

Background:

  • Ectotherms are highly sensitive to ambient temperature changes.
  • Climate warming predictions often rely on mean temperature data, neglecting daily thermal fluctuations.
  • Daily temperature variations influence ectotherm physiology and fitness beyond average conditions.

Purpose of the Study:

  • To investigate how daily temperature fluctuations alter thermal reaction norms in ectotherms.
  • To assess the impact of temperature variability on ectotherm fitness and thermal tolerance limits.
  • To evaluate the implications of these findings for ectotherm vulnerability to climate warming.

Main Methods:

  • Utilized a mosquito as a model organism to study thermal reaction norms.
  • Compared fitness outcomes under constant versus fluctuating temperature regimes.
  • Extrapolated findings to a broader range of terrestrial insects.

Main Results:

  • Temperature fluctuations reduced developmental rates under warm conditions and increased them under cool conditions.
  • Optimum and critical maximum temperatures were lowered by temperature variability.
  • Daily temperature dynamics were found to reduce thermal safety margins in terrestrial insects.

Conclusions:

  • Daily temperature fluctuations create distinct 'realized' thermal norms that differ from 'fundamental' norms.
  • Prevailing daily temperature dynamics significantly influence ectotherm sensitivity to climate warming.
  • The impact of daily temperature dynamics on ectotherm responses to climate change has been largely underestimated.