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Food web context modifies predator foraging and weakens trophic interaction strength.

Kimberley D Lemmen1, Frank Pennekamp1

  • 1Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland.

Ecology Letters
|July 26, 2024
PubMed
Summary
This summary is machine-generated.

Trophic interaction modifications (TIMs) weaken predator-prey dynamics. Adding a third species reduced predator efficiency, impacting community stability and highlighting the need for complex ecological models.

Keywords:
community dynamicsfunctional responsehigher‐order interactionpredator–prey modelspecies interactionstrait‐mediated indirect effectstrophic interaction modification

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Area of Science:

  • Ecology
  • Community Ecology
  • Predator-Prey Dynamics

Background:

  • Trophic interaction modifications (TIMs) are common but their underlying mechanisms and long-term effects are poorly understood.
  • Previous research has focused on documenting TIMs rather than elucidating the processes driving them.
  • Understanding TIMs is crucial for predicting ecological community dynamics.

Purpose of the Study:

  • To experimentally quantify the density-dependent effect of a third species on a predator's functional response.
  • To investigate the impact of TIMs on predator-prey interactions within a ciliate community.
  • To compare ecological models with and without TIMs for predicting community dynamics.

Main Methods:

  • Conducted short-term experiments using ciliate communities comprising a predator, prey, and a non-consumable 'modifier' species.
  • Quantified the predator's functional response and space clearance rate at varying densities of the modifier species.
  • Utilized simulations to model long-term community dynamics, comparing models with and without TIMs.

Main Results:

  • Increasing modifier species density weakened the trophic interaction strength between predator and prey.
  • The weakening of the trophic interaction was attributed to a negative effect on the predator's space clearance rate.
  • Simulated long-term dynamics showed significant quantitative differences between models that included TIMs and those based solely on pairwise interactions.

Conclusions:

  • TIMs significantly influence predator-prey interactions and overall community dynamics.
  • The presence of a third species can alter interaction strengths through mechanisms like reduced predator efficiency.
  • Ecological predictions require models that incorporate TIMs to accurately represent complex community interactions.