Fig. 2: The distribution of baculovirus morphotypes over the range of the Douglas-fir tussock moth across Western North America.

Each pie chart represents the frequency of the two morphotypes aggregated over space from 128 sampled locations using the hclust hierarchical clustering function in the stats v4.3.2 R package. Orange pie slices represent the fraction of insects infected with the single-capsid morphotype, while blue pie slices represent the fraction of insects infected with the multi-capsid morphotype. The size of each pie chart indicates the number of larvae used to calculate the frequencies in that pie chart, with the sample size given to the right of each pie chart. The shading shows the distributions of the preferred host tree species, Douglas-fir (beige), and Abies firs (dark green). The Abies spp. distribution represents multiple Abies species, including grand fir (A. grandis), white fir (A. concolor), subalpine fir (A. lasiocarpa), Pacific silver fir (A. amabilis), and red fir (A. magnifica). Distributions of individual tree species are given in Supplementary Fig. 4. State and Province administrative boundaries for the United States and Canada were downloaded using the gadm function in the geodata v0.5.9 R package. Source data are provided as a Source Data file.