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Related Experiment Video

Updated: Feb 4, 2026

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
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Evolution of thermal tolerance in multifarious environments.

Maria Cuenca Cambronero1, Jordan Beasley1,2, Stephen Kissane1

  • 1Environmental Genomics Group, School of Biosciences, The University of Birmingham, Birmingham, UK.

Molecular Ecology
|October 10, 2018
PubMed
Summary
This summary is machine-generated.

Species extinction is accelerating due to human impact and extreme weather. Research shows thermal tolerance evolves, but multiple environmental stressors complicate predictions of species survival.

Keywords:
CT maxDaphnia magnabody sizeglobal changehaemoglobinheat shock proteins

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Environmental Science

Background:

  • Species extinction rates exceed predictions, driven by human impact and extreme weather events like heat waves.
  • Understanding species' thermal tolerance evolution is crucial for predicting survival, yet knowledge gaps exist regarding environmental stressors.
  • Resurrection ecology offers a powerful approach to study adaptive evolution in natural populations over decadal timescales.

Purpose of the Study:

  • To investigate the physiological and molecular mechanisms of thermal tolerance evolution in Daphnia magna over five decades.
  • To quantify genetic and plastic differences in thermal tolerance traits in response to warming and other environmental changes.
  • To assess the impact of multiple stressors on thermal tolerance and species' evolvability.

Main Methods:

  • Utilized resurrection ecology to resurrect historical and modern Daphnia magna genotypes from a population experiencing environmental change.
  • Measured critical thermal maximum (CTmax), body size, hemoglobin (Hb) content, and heat shock protein (HSP) expression.
  • Exposed genotypes to single and combined stressors: elevated temperature, varying food levels, and insecticide loads.

Main Results:

  • Observed evolution in critical thermal maximum and plastic responses in body size, Hb content, and HSP expression over five decades.
  • Warming alone predicted some evolutionary changes, but molecular and physiological responses in multifarious environments were not solely predictable by warming.
  • Multiple stressors significantly influenced thermal tolerance, deviating from predictions based on warming alone.

Conclusions:

  • Daphnia magna populations exhibit evolutionary adaptation in thermal tolerance, influenced by environmental changes over time.
  • The effects of multiple environmental stressors on thermal tolerance are complex and cannot be predicted by studying warming in isolation.
  • Underestimating the impact of multiple stressors can lead to inaccurate assessments of species' evolvability and persistence in changing environments.