Table 1

Environmental variables used to measure hypothesized environmental drivers of body size patterns in grizzly bears within Alberta, Canada
Hypothesized environmental driver and measurement variable Units Measurement location(s)§ Temporal scale(s)
A. Regional habitat productivity
  Temperature (Winter, Spring, Summer) °C home range 1971-2000
  Precipitation (Winter, Spring, Summer) mm home range 1971-2000
  Ecosystem categories telemetry Ct-1
B. Inter-annual environments (deviations)
  Temperature (Winter, Spring, Summer) °C home range Bt-1, t0, t+1 & Ct-1, t0
  Precipitation (Winter, Spring, Summer) mm home range Bt-1, t0, t+1 & Ct-1, t0
C. Local habitat quality
  Shrub habitat (quadratic) % telemetry Ct-1
  Canopy cover (quadratic) % telemetry Ct-1
  Variation in canopy cover % telemetry Ct-1
  Deciduous canopy cover (quadratic) % telemetry Ct-1
  Forest age (quadratic) years telemetry Ct-1
  Forest age variation years telemetry Ct-1
  Regenerating forest habitat (quadratic) % telemetry Ct-1
  Variation in regen. forest age years telemetry Ct-1
  Soil wetness (quadratic) index telemetry Ct-1
D. Human footprint & activity
  Private lands % telemetry Ct-1
  Protected area % telemetry Ct-1
  Mortality risk index telemetry Ct-1
  Safe harbour habitat index telemetry Ct-1
  Linear feature density km/km2 telemetry Ct-1
  Distance to human feature m telemetry Ct-1
  Distance to active energy well m telemetry Ct-1
E. Landscape change
  Annual rate of habitat change % telemetry Ct-1

§ Home ranges estimated by 50% multi-annual kernels; climate variables measured at kernel centroid; † Temporal scales relate to time of measurements; B relates to birth year & C to capture year. For inter-annual variation, 2-yrs prior to and up to 1-yr following birth or 1-yr prior to and the year of capture are considered.

Nielsen et al.

Nielsen et al. BMC Ecology 2013 13:31   doi:10.1186/1472-6785-13-31

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