We estimated model parameters of competing hypotheses of annual maxima of bison migrating beyond the northern and western boundaries of Yellowstone National Park during 1990–2009.

<p>Point estimates represent medians and ranges are 95% credible intervals of posterior distributions. Abbreviations for models of north migration are intercept (β₀), central herd size (β₁), northern herd size (β₂), accumulated SWE (β₃), aboveground dried biomass (β₄), interaction between the sum of herd sizes and accumulated SWE (β₅), saturation (<i>a</i>), and count detection (<i>d).</i> Abbreviations for models of west migration are intercept (β₀), central herd size (β₁), accumulated SWE (β₂), aboveground dried biomass (β₃), interaction between the central herd size and accumulated SWE (β₄), saturation (<i>a</i>), and count detection (<i>d)</i>. The negative exponential and modified negative exponential models violated convergence criteria and results are not reported.