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Responses to Heat and Cold Stress02:45

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Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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Determining Temperature Preference of Mosquitoes and Other Ectotherms
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How Much Warming Can Mosquito Vectors Tolerate?

Lisa I Couper1,2, Desire Uwera Nalukwago1, Kelsey P Lyberger1

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

Global Change Biology
|December 3, 2024
PubMed
Summary

Climate warming poses risks to mosquito vectors of diseases like malaria and dengue. Some key mosquito species show thermal tolerance, but regions like the Middle East and Australia face high vulnerability.

Keywords:
climate warmingmosquitomosquito‐borne diseasethermal safetywarming tolerance

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Area of Science:

  • Environmental science
  • Vector-borne disease ecology
  • Climate change impact studies

Background:

  • Climate warming is projected to alter the distribution and incidence of mosquito-borne diseases globally.
  • Understanding regional variations in vector vulnerability is crucial for public health preparedness.
  • Less is known about how warming may directly stress or cause local disappearances of mosquito populations.

Purpose of the Study:

  • To estimate thermal safety margins for eight major mosquito vector species across their ranges.
  • To identify which mosquito species and geographic regions are most vulnerable to climate warming.
  • To inform public health strategies by pinpointing areas at high risk from climate-driven changes in vector populations.

Main Methods:

  • Quantified thermal safety margins (difference between upper thermal limit and habitat temperature) for key mosquito vectors.
  • Incorporated realistic assumptions of mosquito behavioral thermoregulation.
  • Mapped vulnerability across the known geographic ranges of selected species.

Main Results:

  • Several medically important mosquito species, including Aedes aegypti and Anopheles gambiae, demonstrate positive thermal safety margins across most of their ranges.
  • Lowest climate vulnerability was observed south of the equator and at northern temperate range edges.
  • Highest climate vulnerability was identified in subtropical regions, particularly in the Middle East, western Sahara, and southeastern Australia.

Conclusions:

  • While some major mosquito vectors may tolerate warming in many areas, specific regions face heightened climate vulnerability.
  • Mosquitoes in desert and xeric shrubland biomes exhibit the greatest vulnerability to climate warming.
  • Targeted public health interventions are needed for regions with high vector vulnerability to mitigate disease spread.