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Related Experiment Video

Updated: Jun 20, 2026

JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning
09:23

JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning

Published on: March 21, 2025

Effects of predator functional diversity on grassland ecosystem function.

Oswald J Schmitz1

  • 1School of Forestry and Environmental Studies, Yale University, 370 Prospect Street, New Haven, Connecticut 06515, USA. oswald.schmitz@yale.edu

Ecology
|September 23, 2009
PubMed
Summary
This summary is machine-generated.

Predator functional diversity, influenced by hunting modes, impacts grassland ecosystems. These effects on plant diversity and nutrient cycling are largely predictable based on individual predator impacts.

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Area of Science:

  • Ecology
  • Ecosystem Science
  • Community Ecology

Background:

  • Individual predator species significantly influence plant communities and ecosystem functions like production and nutrient cycling.
  • Predator hunting mode is a key functional trait determining these impacts.
  • The combined effects of predators with different hunting modes on ecosystem function remain largely unknown.

Purpose of the Study:

  • To quantify the net effects of two spider species with different hunting modes (sit-and-wait vs. active hunting) on a New England grassland ecosystem.
  • To investigate how predator functional diversity, manipulated by varying the dominance ratio of these two species, influences plant composition and ecosystem functioning.

Main Methods:

  • An experiment was conducted in a New England grassland.
  • A replacement series design was used to manipulate predator functional diversity by altering the dominance ratio of a sit-and-wait and an actively hunting spider species across five treatments.
  • Effects on plant diversity, plant litter quality, elemental cycling, and production were quantified.

Main Results:

  • Predator functional diversity significantly impacted plant diversity and plant litter quality.
  • These effects extended to influence ecosystem processes such as elemental cycling and overall production.
  • Many observed ecosystem effects were closely approximated by the weighted average of the individual predator species' effects.

Conclusions:

  • Predator functional diversity, driven by distinct hunting modes, has cascading effects throughout grassland ecosystems, influencing both biotic and abiotic components.
  • The ecosystem-level impacts of predator functional diversity appear to be largely additive rather than exhibiting strong nonlinearities.
  • Understanding predator hunting modes is crucial for predicting their combined influence on ecosystem structure and function.