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The body-size dependence of mutual interference.

John P DeLong1

  • 1School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE 68588, USA jpdelong@unl.edu.

Biology Letters
|June 13, 2014
PubMed
Summary

Population dynamics are influenced by body size, but mutual interference, linking foraging rates to consumer density, is often body-size independent. This study models and supports the idea that interference effects are constant across consumer sizes.

Keywords:
allometryinteraction strengthinterferencepopulation dynamics

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Area of Science:

  • Ecology
  • Theoretical Ecology
  • Population Dynamics

Background:

  • Population dynamics are typically linked to organism body size.
  • Mutual interference, which relates foraging rates to consumer density, lacks established body-size dependence.
  • Existing theory and empirical data do not support a relationship between mutual interference and body size.

Purpose of the Study:

  • To develop a model predicting the relationship between mutual interference and body size.
  • To investigate how resource body size scaling influences interference.
  • To test the hypothesis of body-size independence for mutual interference.

Main Methods:

  • Development of a theoretical model for mutual interference.
  • Analysis of how resource body size scales with consumer body size.
  • Empirical testing using a new dataset on interference and consumer body size.

Main Results:

  • The model predicts interference can be positively or negatively related to body size based on resource scaling.
  • Over a broad range of body sizes, the model predicts body-size independence of interference.
  • Empirical data supported the prediction of body-size independent interference.

Conclusions:

  • The stabilizing effect of intermediate mutual interference is largely constant across different consumer body sizes.
  • Body size impacts population dynamics primarily through parameters other than mutual interference.
  • This finding has implications for understanding ecological stability and community structure across diverse taxa.