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Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a...
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Predation alters community structure through multiple trophic cascades.

Robin S Baker1,2, Cy L Mott2,3, Howard H Whiteman1,2

  • 1Watershed Studies Institute and Department of Biological Sciences, Murray State University, Murray, Kentucky, USA.

The Journal of Animal Ecology
|June 23, 2025
PubMed
Summary
This summary is machine-generated.

Predator body size variation can strengthen top-down control in ecological communities. Increased variation in predator size led to stronger effects on prey populations and trophic cascades.

Keywords:
food websfunctional traitsmulti‐channel consumptionsize structuretop‐down control

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Area of Science:

  • Ecology
  • Community Ecology
  • Predator-Prey Dynamics

Background:

  • Predation significantly influences community structure and can trigger trophic cascades.
  • Intraspecific variation in predator traits, like body size, may affect the strength of top-down control.

Purpose of the Study:

  • To investigate how body size variation in predatory mole salamanders (Ambystoma talpoideum) influences top-down control and trophic cascades.
  • To test the hypothesis that increased predator size variation leads to weaker top-down control.

Main Methods:

  • Mesocosm experiment manipulating body size variation in mole salamander populations.
  • Monitoring of biotic responses across multiple trophic levels, including invertebrate predators and collectors.
  • Analysis of trophic cascades through both 'green' and 'brown' pathways.

Main Results:

  • Salamander presence broadly impacted community parameters, altering populations of invertebrate predators and collectors.
  • Increased predator body size variation, contrary to predictions, resulted in stronger top-down control on focal prey.
  • Dietary specialization among differently sized predators may explain the enhanced control observed with size variation.

Conclusions:

  • Predator body size structure can significantly influence community dynamics and trophic interactions.
  • Increased intraspecific body size variation in predators can enhance overall top-down control and cascade strength.
  • Predators exert pervasive, multichannel effects on ecosystems irrespective of their size structure.