Fig. 2
From: Global diversity and biogeography of DNA viral communities in activated sludge systems
Biogeographic diversity patterns of activated sludge (AS) viruses. A, B Distance-decay relationships (DDRs) based on Bray–Curtis dissimilarity of viral community and functional gene structures. C Latitudinal diversity patterns of viral community richness. First- and second-order polynomial fits are shown in blue and black, respectively. The best polynomial fit was determined (as underlined) based on the corrected Akaike Information Criterion (AICc)