Pearson correlation coefficients (r) of disturbance variables examined at both sites (north and south) and spatial extents (200m and 450 m radius) along with the complete set of models used to evaluate the influence of natural gas disturbance on grassland songbird abundance.

Also included with the models are their Akaike Information Criterion (AIC) ranks, AIC weights, parameter estimates and 85% confidence limits. See S1 Table for description of explanatory variables. HOLA = horned lark, SPPI = Sprague’s pipit, CCLO = chestnut-collared longspur, TBLO = Thick-billed longspur, GRSP = grasshopper sparrow, CCSP = clay-colored sparrow, BRSP = Brewer’s sparrow, VESP = vesper sparrow, BAIS = Baird’s sparrow, SAVS = Savannah sparrow, and WEME = western meadowlark. (XLSX)