Sensitivity of landscape resistance estimates based on point selection functions to scale and behavioral state: Pumas as a case study

Katherine A. Zeller, Kevin McGarigal, Paul Beier, Samuel A. Cushman, T. Winston Vickers, Walter M. Boyce

Research output: Contribution to journalArticle

62 Scopus citations

Abstract

Estimating landscape resistance to animal movement is the foundation for connectivity modeling, and resource selection functions based on point data are commonly used to empirically estimate resistance. In this study, we used GPS data points acquired at 5-min intervals from radiocollared pumas in southern California to model context-dependent point selection functions. We used mixed-effects conditional logistic regression models that incorporate a paired used/available design to examine the sensitivity of point selection functions to the scale of available habitat and to the behavioral state of individual animals. We compared parameter estimates, model performance, and resistance estimates across 37 scales of available habitat, from 250 to 10,000 m, and two behavioral states, resource use and movement. Point selection functions and resistance estimates were sensitive to the chosen scale of the analysis. Multiple characteristic scales were found across our predictor variables, indicating that pumas in the study area are responding at different scales to different landscape features and that multi-scale models may be more appropriate. Additionally, point selection functions and resistance estimates were sensitive to behavioral state; specifically, pumas engaged in resource use behavior had an opposite selection response to some land cover types than pumas engaged in movement behavior. We recommend examining a continuum of scales and behavioral states when using point selection functions to estimate resistance.

Original languageEnglish (US)
Pages (from-to)541-557
Number of pages17
JournalLandscape Ecology
Volume29
Issue number3
DOIs
StatePublished - Mar 1 2014

Keywords

  • Conditional logistic regression
  • Connectivity
  • Cost-surface
  • Puma concolor
  • Resistance surface
  • Resource selection function

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Ecology
  • Nature and Landscape Conservation

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