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Updated: Jul 10, 2025

Determining Temperature Preference of Mosquitoes and Other Ectotherms
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Temperature and intraspecific variation affect host-parasite interactions.

Sherine Ismail1, Johannah Farner1, Lisa Couper1

  • 1Department of Biology, Stanford University, Stanford, USA.

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PubMed
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Climate warming impacts aquatic ecosystems and disease transmission. This study reveals temperature affects parasite growth and infection, with local adaptation influencing responses.

Keywords:
AedesLambornellaInfectionThermal performanceWarming

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Area of Science:

  • Ecology
  • Parasitology
  • Climate Change Research

Background:

  • Parasites are crucial regulators of aquatic ecosystems.
  • The effects of climate warming on parasite ecology and disease transmission are not well understood.
  • Temperature's impact on host-parasite interactions is complex due to multiple species and varied thermal responses.

Purpose of the Study:

  • To investigate the impact of temperature on host-parasite interactions and disease transmission using a mosquito-parasite model system.
  • To determine how warming affects parasite growth and infection rates.
  • To explore intraspecific variation in parasite thermal responses and local adaptation.

Main Methods:

  • A common garden experiment was conducted using a mosquito species and its facultative parasite.
  • Parasite growth and infection rates were measured across seven different temperatures.
  • 12 field-collected parasite populations and one mosquito population were utilized.

Main Results:

  • Parasite free-living growth and infection rates showed temperature-dependent variations, peaking at 18-24.5°C and 13°C, respectively.
  • Intraspecific variation in thermal optima for parasite growth was observed, correlating with source environment temperatures (local adaptation).
  • A significant interaction between parasite population and nonlinear temperature effects was found for infection rates.

Conclusions:

  • Both host and parasite thermal responses are critical for understanding climate change impacts on disease.
  • Intraspecific variation in thermal responses must be considered when predicting disease dynamics under climate warming.
  • Warming's effects on aquatic disease transmission are complex and depend on species-specific and population-level thermal adaptations.