Fig. 2.
From: Fire regime effects on annual grass seeds as food for threatened grass-finch
The change (Δ) in response variables (plant density, plant seed density, and seed density) shown for highly influential predictor variables, i.e., month of last fire (a, c), and time since last fire (b). Relationships are displayed as contrast plots of fixed effects, with the mean value of the response variable as a reference point for change. In this way, random effects drop out of the model, which allows estimation of confidence intervals. The black line is model fit and the grey band represents 95% confidence interval. P-values for response variables included as polynomial terms (2° = quadratic, 3° = cubic) are shown with significance levels (** = 0.01, * = 0.05). Plant density, plant seed density, and seed density data were collected from all Wyndham, Western Australia, sites (Bastion Hill, Caravan Park, King River Road 1 and 2, Golf Course 1 and 2, and Parry Creek Reserve) during Sorghum spp. seed set in March and April of 2013, 2014, and 2015.