Table 4. Model results for winter climate variability (mean
number of above-zero days during January-March), July mean temperature,
and bioclimatic zones (proportion of presumed optimal bioclimatic zone
of the surrounding 25 km2 landscape) on
characteristics of rodent population dynamics. The models for community
contribution (abbreviated as “community cont.”) include all available
sampling units, while the models for cycle amplitude include only the
sampling units where a given genus was present, sample size given in
parenthesis. For voles, the presumed optimal bioclimatic zone is the low
alpine zone, for lemming the middle alpine zone. Results for best models
are shown, dataset A refers to “all data” (n=22 locations), dataset N
to “Norwegian data only” (n=17 locations). Values in parentheses show
95% confidence limits; predictor variable estimates for which the 95%
confidence interval does not cross zero are denoted in bold. Random
effects are given as standard deviation of variation; in parentheses is
the proportion of variance assigned to location effect. Star denotes
effects that were statistically significant when data from fall only was
included in the models. Dash denotes variables that were included in the
set of evaluated models, but did not appear in the best model, whereas
empty cells denote variables that were not evaluated in the given model
set. Reference level for the factorial variable sampling season is fall;
the effect size estimate corresponds to a difference between fall and
spring. See Appendix 1 for model selection table (Tables A6, A7) and
results at 9 km2 and 1 km2 (Tables
A8, A9).