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. 2021 May 26;7(22):eabe2592. doi: 10.1126/sciadv.abe2592

Fig. 4. Phylogenetic evidence of transmission between populations.

Fig. 4

Maximum clade credibility phylogeographic tree of samples from the Eastern Pacific (n = 190) (based on full genome sequences where available). The tree is time scaled, and branch colors depict the most probable inferred population ancestor (populations originating from BC rivers and hatcheries, the Columbia River, farmed Atlantic salmon, and farmed Chinook salmon). The inset circular plot depicts the relative rates of transmission (depicted by the thickness of the arrows) between populations in the NE Pacific. These rates were estimated by the structured coalescent model implemented in BEAST 2.6.2. Note that phylogeographic reconstruction is sampling dependent, and in our study, the number of farmed (n = 133) and wild/hatchery (n = 57) salmon is relatively equal, whereas we estimate the number of PRV-infected farmed fish to vastly exceed the number of PRV-infected wild fish (table S3). Therefore, we predict that our model may substantially underestimate transmission from farmed to wild salmon.