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Development of New Methods for Quantifying Fish Density Using Underwater Stereo-video Tools
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Evaluating distributional shifts in home range estimates.

Justin G Clapp1, Jeffrey L Beck2

  • 1Department of Ecosystem Science and Management University of Wyoming Dept. 3354 1000 East University Avenue Laramie Wyoming 82071 ; Wyoming Game and Fish Department 260 Buena Vista Drive Lander Wyoming 82520.

Ecology and Evolution
|October 8, 2015
PubMed
Summary
This summary is machine-generated.

Comparing utilization distributions (UDs) across isopleths reveals multiscale home range changes. This method provides a more comprehensive evaluation of animal movement and habitat use shifts.

Keywords:
Brownian bridgeOvis canadensisglobal positioning systemhome range comparisonsisoplethutilization distribution

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Area of Science:

  • Ecology
  • Wildlife Biology
  • Spatial Ecology

Background:

  • Animal home range estimation commonly uses location data from telemetry.
  • Global positioning system (GPS) technology enables quantification of home range use intensities via utilization distributions (UDs).
  • Variability within UDs is often overlooked, complicating comparisons and summary of distributional shifts.

Purpose of the Study:

  • To introduce a novel approach for analyzing home range changes by comparing utilization distributions (UDs) across isopleths.
  • To provide a method for summarizing these comparisons into meaningful results for enhanced ecological insights.
  • To demonstrate the approach's efficacy using bighorn sheep (Ovis canadensis) movement data before and after habitat alterations.

Main Methods:

  • Utilized global positioning system (GPS) location data from 16 bighorn sheep.
  • Constructed utilization distributions (UDs) to represent home range use intensity.
  • Compared UDs across multiple isopleths to assess distributional changes at various scales.
  • Quantified changes in home range size, overlap, and joint-space use.

Main Results:

  • A consistent increase in bighorn sheep home range size was observed across all measured levels.
  • Home range overlap and similarity values decreased when analyzed at higher core utilization levels.
  • Multiscale assessment revealed nuanced changes in spatial distribution and habitat use.

Conclusions:

  • Comparing utilization distributions (UDs) across isopleths offers a more comprehensive evaluation of animal home range dynamics.
  • This multiscale approach enhances the understanding of distributional shifts, particularly after habitat alterations.
  • Researchers are encouraged to adopt expanded comparative home range analyses for deeper ecological insights.