Model selection results for analysis evaluating the effects of vegetation structure, topography and grazing on the presence of three grassland bird species.

Models are top performing model set of 20 candidate models fit using a generalized linear mixed model with site and year as random effects. Top candidate model set includes models within AIC<4 of the top performing model. Table includes the number of parameters (k) in each model, the change in AICc from the best performing model to all others,the AICc weight (w) or strength of evidence for each model, the marginal R2 (R2GLMM(m)), and the conditional R2 (R2GLMM(c)) values indicating the variance explained by the fixed effects (marginal R2) and fixed and random effects (conditional R2) terms in each model.