Figure 4.

Observed (boxplots) versus expected (diamonds) female antler concentrations at the Jago Bitty calving ground. Expected antler concentration is based on aerial survey data from 1983 to 2010 (see the electronic supplementary material, text 6.0). To approximate the time period represented by aerial surveys, observed antler concentrations only include shed female antlers in WSs 0–3. Expected antler concentration at Jago Bitty is near the median of observed antler concentrations from the bone assemblage (combined habitats). Plots of tussock tundra-dominated habitats have lower-than-expected concentrations of antlers. Riparian terraces have higher-than-expected concentrations of shed female antlers. Data suggest parturient female caribou strongly stratify their habitat use during portions of the calving period in favour of riparian terraces.