Figure 6: Elk births and carnivore use of predicted elk
parturition habitat as a function of Julian week in northeastern Oregon,
2016-2019. a) The density of elk births as a function of Julian week.
Bars indicate counts of births per week and the blue curve is a normal
distribution fit to the data. The dashed tan line indicates the mean
birth date. b-d) Predictions from linear mixed models relating the
weekly average resource selection function (RSF) score for parturient
elk at carnivore GPS relocations for male bears (b), female bears (c),
and cougars (d) as a quadratic function of Julian week. The solid blue
lines display the model predictions for carnivore use of elk parturition
habitat and the gray shading represents its 95% confidence interval.P -values correspond to the outcome of likelihood ratio tests
assessing whether the models containing quadratic terms for Julian week
were supported over models with only a linear term for Julian week.