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Determining Temperature Preference of Mosquitoes and Other Ectotherms
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Temperature Alters Specificity in a Host-Parasite Interaction.

Abbey Ramirez1, Amanda Gibson1

  • 1Department of Biology University of Virginia Charlottesville Virginia USA.

Ecology and Evolution
|July 10, 2026
PubMed
Summary

Environmental temperature alters host-parasite specificity, challenging the Red Queen Hypothesis. This genetic interaction (GH×GP) is influenced by environmental context (GH×GP×E), impacting genetic diversity maintenance.

Keywords:
MeloidogynePasteuriaRed Queen Hypothesisantagonistic coevolutiongenotype × genotype × environment interaction (G×G×E)negative frequency‐dependent selection

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Area of Science:

  • Evolutionary Biology
  • Ecology
  • Genetics

Background:

  • The Red Queen Hypothesis suggests genetic variation is maintained by host-parasite coevolution.
  • A key assumption is strict genetic specificity in host-parasite interactions.
  • Environmental factors may disrupt this specificity, questioning the hypothesis's robustness.

Purpose of the Study:

  • To experimentally test if temperature affects host-parasite specificity.
  • To evaluate the impact of environmental context on coevolutionary dynamics.
  • To assess the challenge posed by GH×GP×E interactions to the Red Queen Hypothesis.

Main Methods:

  • Used the plant-parasitic nematode Meloidogyne arenaria and its parasite Pasteuria penetrans.
  • Exposed six host lines to five parasite sources across three temperatures.
  • Analyzed how temperature influenced GH×GP interactions and infection susceptibility.

Main Results:

  • Host-parasite specificity (GH×GP) was observed at two of three temperatures.
  • Specificity varied significantly across temperatures, indicating a GH×GP×E effect.
  • Changes in specificity strength and host-parasite susceptibility rankings were temperature-dependent.

Conclusions:

  • Environmental temperature can alter host-parasite specificity.
  • The findings support the role of GH×GP×E interactions in coevolution.
  • This suggests environmental context is crucial for understanding the maintenance of genetic diversity.