Figure captions
Figure 1: Behavioural reaction norms testing the relationship between population density and A) social network strength and B) habitat specialization for caribou (Rangifer tarandus ; n = 127) in Newfoundland. Each line represents an individual behavioural response to changes in population density and crossing of lines represents individual differences in plasticity (i.e., an individual-environment interaction).
Figure 2: phenotypic covariance between social strength and habitat specialization in caribou (Rangifer tarandus , n = 127) in Newfoundland.
Figure 3: phenotypic covariance between reproductive success and habitat specialization at relatively high (orange points) and relatively low (blue points) population density for caribou (Rangifer tarandus , n = 127) in Newfoundland. At high density, more specialized individuals also tended to have an overall higher fitness value, whereas there was no effect of habitat specialization on fitness at low density. Note, both variables are extracted from best linear unbiased predictors (BLUPs) extracted from mixed models for visualization.