Fig. 3: Results for site-level correlations of the total insect community and further environmental variables.
From: Insect decline in forests depends on species’ traits and may be mitigated by management
Site-level correlations (each shown as partial residuals of Pearson’s r between year and the respective community response) for species richness were related to a change in deadwood volume, b change in the proportion of non-native trees, c change in canopy openness, and d PC1 of landscape heterogeneity. For species abundance, site-level correlations were related to e tree diversity, f the effective number of layers, and g change in canopy openness. Site-level correlations for biomass were related to h the change in the proportion of non-native trees. For explanations of variables see Supplementary Table 1. Full statistical details are available in Supplementary Data 1. Regression lines (95% CI in shaded polygons) indicate the marginal predictions of linear mixed-effects models. Dashed horizontal lines mark null with negative values indicating sites with declining and positive values sites with increasing community responses over time. Note that the x-axes in a, b, c, g and h are on a symmetric square-root scale.
