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Related Experiment Video

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Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
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Published on: March 13, 2014

Multiple predators indirectly alter community assembly across ecological boundaries.

Jeff S Wesner1, Eric J Billman, Mark C Belk

  • 1Department of Biology, 401 WIDB, Brigham Young University, Provo, Utah 84602, USA. jeffwesner@gmail.com

Ecology
|August 28, 2012
PubMed
Summary
This summary is machine-generated.

Predator cues, not just their presence, significantly reduce insect populations in high-quality habitats. This indicates that indirect effects of predators strongly influence habitat selection and community assembly.

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Area of Science:

  • Ecology
  • Behavioral Ecology
  • Community Ecology

Background:

  • Habitat selection models often overlook landscape position, focusing solely on intrinsic habitat quality.
  • The influence of predator presence versus cues on habitat choice remains incompletely understood.

Purpose of the Study:

  • To investigate how predator cues, independent of direct predation, affect habitat selection and aquatic insect abundance.
  • To determine if the strength of predator effects varies with predator species number, biomass, or origin.

Main Methods:

  • Experimental aquatic habitat patches were established with varying proximity to caged predators (predator-associated vs. isolated controls).
  • Larval insect colonization was monitored over 16 days in high-quality, predator-free patches under different predator cue treatments.
  • Treatments included single or multiple predator species, varying predator biomass, and native/nonnative predators.

Main Results:

  • Larval insect abundance decreased by approximately 50% in both predator and predator-associated treatments compared to controls.
  • Predator effects were consistent across variations in predator species, biomass, and native/nonnative status.
  • The strength of the observed effects did not rely on the physical presence of predators, highlighting the impact of cues.

Conclusions:

  • Predator cues alone can significantly alter habitat selection and reduce abundance in intrinsically high-quality habitats.
  • Indirect ecological effects, mediated by predator cues, can cascade across landscape boundaries and influence community assembly.
  • Habitat selection is influenced by perceived risk, not solely by direct predation or intrinsic habitat value.