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Intra-guild predation (IGP) can increase or decrease prey density depending on the strength of IGP.

Feng-Hsun Chang1, Bradley J Cardinale1,2

  • 1School for Environment and Sustainability, University of Michigan, 440 Church Street, Ann Arbor, Michigan, USA.

Ecology
|February 18, 2020
PubMed
Summary
This summary is machine-generated.

Intra-guild predation (IGP) can decrease or increase basal resource density. This study found resource density initially dropped then rose with increasing IGP strength, challenging prior assumptions.

Keywords:
BlepharismaColpidiumcompetitionintra-guild predationmicrocosmspopulation dynamicspredationprotozoa

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Area of Science:

  • Ecology
  • Community Ecology
  • Predator-Prey Dynamics

Background:

  • Intra-guild predation (IGP) is common in consumer communities.
  • IGP is often assumed to increase resource density.
  • Recent theory suggests resource density may decrease then increase with IGP strength.

Purpose of the Study:

  • To test the prediction that basal resource density decreases then increases with increasing IGP strength.
  • To investigate the complex effects of IGP on resource density in a consumer community.

Main Methods:

  • Used a protozoa-bacteria system to study IGP.
  • Experimentally manipulated IGP strength by controlling prey availability to predators.
  • Employed a modified intra-guild predation model to analyze results.

Main Results:

  • Bacterial density decreased by ~25% then increased by ~30% as IGP strength rose.
  • The modified IGP model explained ~70% of the variation in consumer and resource densities.
  • Empirical findings aligned with model predictions regarding density fluctuations.

Conclusions:

  • IGP's impact on resource density is dependent on its strength.
  • Weak to intermediate IGP decreased resource density by increasing predator density.
  • Stronger IGP led to increased resource density as predators became satiated.