Extended Data Figure 2 : Phylogenetic signal in host sharing.

From: Phylogenetic structure and host abundance drive disease pressure in communities

Extended Data Figure 2

a, b, The influence of phylogenetic relationship on the probability of sharing a pest between two hosts was modelled from a database of 1,670 pests on 210 angiosperm host genera in the US Department of Agriculture Global Pest and Pathogen Database (described in ref. 35). Phylogenetic distances are calculated from the updated phylogenetic tree R2G2_20140601 (Supplementary Information). The regression takes the form of logit(S) = β0 + β1 × log10(PD + 1), where S is the probability of susceptibility and PD is the phylogenetic distance (time of independent evolution, in Myr) between the source and target host genera. The probability that a target host is susceptible to a pest from a source host is then S = exp(logit(S))/[1 + exp(logit(S))]. Coefficients were calculated for nine groups of pests/pathogens: bacteria, fungi, oomycetes, insects, mites, molluscs, nematodes, viruses and plants (Extended Data Table 1). a, b, Coefficients were generated for all pests (a), and for the subset of (polyphagous) pests known from more than one host genus (b). The latter is how the analysis was originally done in ref. 35.