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Updated: Jan 4, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Reducing Native Ant Abundance Decreases Predation Rates in Midwestern Grasslands.

Bd Wills1, Tn Kim2, Af Fox1

  • 1Department of Entomology and DOE Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI.

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Summary

Ants play a crucial role in suppressing insect prey in grasslands. Reducing ant populations, even modestly, significantly decreases prey removal rates, highlighting their importance in natural pest control.

Keywords:
Lasius neonigerdiversitynatural enemiespredation servicesprey suppression

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Area of Science:

  • Ecology
  • Entomology
  • Conservation Biology

Background:

  • Predator diversity is key for effective prey suppression.
  • Ants are common in terrestrial ecosystems but their role in prey suppression in temperate grasslands is understudied.
  • Separating ant predation from other predators is challenging.

Purpose of the Study:

  • To investigate the contribution of ants to prey suppression in grasslands.
  • To determine if reducing ant populations impacts non-ant predator abundance.
  • To quantify the effect of ant reduction on sentinel prey removal.

Main Methods:

  • Used poison baits and physical exclosures to selectively reduce ant populations in common garden settings.
  • Monitored ant and non-ant ground predator abundance and diversity for 7 weeks.
  • Tracked the removal rates of sentinel egg prey.

Main Results:

  • Poison baits successfully reduced ant abundance without significantly affecting non-ant ground predators.
  • A decrease in ant abundance led to a reduced proportion of sentinel prey eggs removed.
  • Even a ~20% reduction in key ant species, like Lasius neoniger, lowered prey removal rates.

Conclusions:

  • Ants disproportionately contribute to ground-based predation of arthropod prey in grasslands.
  • Changes in grassland extent and management practices may influence ant populations and their ecological services.
  • Ants are significant contributors to natural prey suppression in grassland ecosystems.