Fig. 10. Robustness-testing, performed by varying the assumed relative length of the winter used in the set of equations for τw [τwSWi = blogit(cWISWi), τwNEi = blogit(cWINEi)], and predicted change in the annual dynamic for increasing length of winter season. Estimates of density dependencies from pooled analyses (Table 1) are utilized to predict how changes in the relative length of the winter may influence the annual dynamic. For each area (the northern and southern part of Groups 1, 2, and 5), seasonal estimates are divided by average season length to estimate per time-unit seasonal density dependencies. The direct and delayed annual density dependencies are generally predicted to become stronger the longer the winter. Arrows show the expected change for an increase of 0.1 in τw.