Fig. 3From: The patterns of co-occurrence variation are explained by the low dependence of bark beetles (Coleoptera: Scolytinae and Platypodinae) on hosts along altitude gradientsPCA analysis of the correlation between communities of bark beetles (A) and trees (B) with selected seven environmental variables at regional scale based on the RDA method. All bark beetles and trees abundances data were Hellinger transformedBack to article page