Landscape Ecology

, Volume 20, Issue 3, pp 273–287 | Cite as

Scales of movement by elk (Cervus elaphus) in response to heterogeneity in forage resources and predation risk

  • Jacqueline L. Frair
  • Evelyn H. Merrill
  • Darcy R. Visscher
  • Daniel Fortin
  • Hawthorne L. Beyer
  • Juan M. Morales
Research article

Abstract

Animals may respond to spatial and temporal heterogeneity by altering their movement patterns. The time an animal spends in an area of a given size is termed ȁ8first-passage timeȁ9 and can be used to identify the scales at which different movement processes occur. Using first-passage time and 2-h observations, we identified nested spatial scales representing three movement behaviours for elk (Cervus elaphus) – inactive/resting (moves  < 50 m), active/foraging (x̄ = 276.7 m, SD = 56.6), and active/relocating (x̄ = 1628.3 m, SD = 436.6). Our ability to identify inactive behaviour was limited by GPS accuracy. The scale separating relocating and foraging behaviour ranged 550–1650 m across individuals and varied quadratically with the mean patch size of cutover forest in an animal’s home range. We classified path segments into the 3 movement behaviours and related behaviours to local environmental conditions. Elk were likely to be inactive in areas having a low predicted use by wolves (Canis lupus), farther than 50 m from anthropogenic linear clearings, and where microclimatic conditions were cool (high shrub cover and north to east-facing slopes). In contrast, elk were most likely to forage in areas having intermediate levels of herbaceous biomass and low movement costs. Elk were most likely to be relocating when in areas of high wolf use, when close to linear clearings, and in energetically costly situations such as moving upslope. We discuss how elk use of potential foraging habitats may be restricted in this landscape by risks imposed by predators, humans, or both.

Keywords

First-passage time Landscape structure Seismic lines Timber harvest Trade-offs 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Jacqueline L. Frair
    • 1
  • Evelyn H. Merrill
    • 1
  • Darcy R. Visscher
    • 1
  • Daniel Fortin
    • 1
    • 3
  • Hawthorne L. Beyer
    • 1
  • Juan M. Morales
    • 2
  1. 1.Department of Biological SciencesUniversity of AlbertaAlbertaCanada
  2. 2.Ecology and Evolutionary BiologyUniversity of ConnecticutUSA
  3. 3.Département de biologieUniversité LavalQuébecCanada

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