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Development of New Methods for Quantifying Fish Density Using Underwater Stereo-video Tools
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Quantifying behavioral changes in territorial animals caused by sudden population declines.

Jonathan R Potts1, Stephen Harris, Luca Giuggioli

  • 1Bristol Centre for Complexity Sciences, University of Bristol, Bristol, UK.

The American Naturalist
|August 13, 2013
PubMed
Summary
This summary is machine-generated.

Urban red foxes (Vulpes vulpes) dynamically adjust their territories in response to population density changes. This study explains how individual movement and interaction strategies maintain contiguous territories even during population declines, validating the elastic disc hypothesis.

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Area of Science:

  • Behavioral Ecology
  • Movement Ecology
  • Mathematical Biology

Background:

  • Territorial animals maintain exclusive space, yet home ranges often overlap.
  • Mechanistic models of collective animal movement offer a new approach to understanding space use.
  • Previous explanations for territorial dynamics lacked empirical validation.

Purpose of the Study:

  • To unify the concepts of exclusive territories and overlapping home ranges using mechanistic models.
  • To investigate how red fox (Vulpes vulpes) territorial behavior changed during a population density decline.
  • To provide a data-validated, mechanistic explanation for the elastic disc hypothesis.

Main Methods:

  • Applied recently developed mechanistic models of collective animal movement.
  • Analyzed movement and interaction data from an urban red fox population experiencing a sarcoptic mange epizooty.
  • Quantified changes in territory border movement and response to olfactory cues.

Main Results:

  • Red foxes adapted their behavior to acquire vacated areas following neighbor mortality.
  • Territory boundaries remained contiguous despite population density reduction.
  • The rate of territory border movement increased eightfold, and response time to neighboring scent decreased by one-third.

Conclusions:

  • Observed territorial patterns emerge from individual animal movements and interactions.
  • The study provides the first data-validated, mechanistic explanation of the elastic disc hypothesis.
  • Mechanistic models effectively explain complex spatial dynamics in animal populations.