Models tested for detecting factors influencing seed mass in caches based on nest-sampling investigations.

Abbreviations: SDP = sample distances to nearest Korean pine stand, SP = sample plot, ε was the residual.The last model was selected as the final explanatory model according to minimum AICc. Statistical tests of the model: ANOVA, Year effect, F4,666 = 3.47, P = 0.008; Effect of sample plot, F1,666 = 0.004, P = 0.95; Effect of interaction of year and sample plot, F4,666 = 2.78, P = 0.03.