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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Warming impact on herbivore population composition affects top-down control by predators.

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|April 21, 2017
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Summary

Warming impacts herbivore composition, not size, enhancing predator biocontrol of pests like aphids. This shift in population traits influences colonization dynamics in agricultural systems under climate change.

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Agricultural Entomology

Background:

  • Understanding warming's effects on herbivores is crucial for predicting plant and crop dynamics.
  • Warming's impact on herbivore population size and composition, and subsequent colonization, remains unclear.
  • Tri-trophic systems (plant-herbivore-predator) are key to agricultural pest management and ecosystem stability.

Purpose of the Study:

  • To investigate how warming affects aphid population size and composition (alate proportion).
  • To determine if warming-induced effects on aphids interact with lady beetle predators to influence aphid colonization.
  • To assess the potential for enhanced biocontrol of crop pests under warming conditions.

Main Methods:

  • Laboratory warming experiment: exposed soybean aphids to +2°C and +4°C to measure population size and alate proportion.
  • Field colonization experiment: examined the interaction between warming-induced aphid traits and lady beetle presence on aphid colonization.
  • Utilized a soybean-aphid-lady beetle system as a model tri-trophic interaction.

Main Results:

  • Warming significantly altered aphid population composition by reducing the proportion of winged aphids (alates).
  • Warming did not affect the overall aphid population size.
  • Reduced alate proportion under warming enhanced top-down control by lady beetles, slowing aphid colonization.
  • Aphid colonization was influenced by the interaction between alate proportion and lady beetle presence.

Conclusions:

  • Warming influences herbivore population composition, which mediates predator control and affects colonization.
  • Biocontrol of crop pests by predators may be enhanced under moderate warming (2-4°C).
  • Shifts in population composition are a crucial, underappreciated mechanism in climate change ecology.