Modeling multi-scale resource selection for bear rubs in northwestern Montana

Matthew J. Morgan Henderson, Mark Hebblewhite, Michael S. Mitchell, Jeff B. Stetz, Katherine C. Kendall, Ross T. Carlson

Research output: Contribution to journalArticlepeer-review

Abstract

Both black (Ursus americanus) and grizzly bears (U. arctos) are known to rub on trees and other objects, producing a network of repeatedly used and identifiable rub sites. In 2012, we used a resource selection function to evaluate hypothesized relationships between locations of 887 bear rubs in northwestern Montana, USA, and elevation, slope angle, density of open roads and distance from areas of heightened plant-productivity likely containing forage for bears. Slope and density of open roads were negatively correlated with rub presence. No other covariates were supported as explanatory variables. We also hypothesized that bear rubs would be more strongly associated with closed roads and developed trails than with game trails. The frequencies of bear rubs on 30 paired segments of developed tracks and game trails were not different. Our results suggest bear rubs may be associated with bear travel routes, and support their use as "random" sampling devices for non-invasive spatial capture-recapture population monitoring.

Original languageEnglish
Pages (from-to)28-39
Number of pages12
JournalUrsus
Volume26
Issue number1
DOIs
StatePublished - May 1 2015

Keywords

  • Resource Selection Function
  • Ursus americanus
  • Ursus arctos
  • bear rub
  • non-invasive genetic sampling

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