Fig. 4From: Oviposition preference of the forest cockchafer (Melolontha hippocastani Fabr. 1801) at the stand scale depends on oak proportion, canopy openness and ground accessibilityMelolontha hippocastani egg-cluster density plotted against relative proportion of oak basal area (A) and canopy openness (B) in the study plots. The black line is the regression curve from the negative binomial model (with a log-transformation of x for canopy openness) and the gray area indicates the 95% confident intervalBack to article page