Figure 3. Host migratory distribution and IAV circulation in
the North Atlantic. Significant discrete phylogeographic transitions
between Iceland, the rest of Europe, and North America are represented
by arrows from mainland Europe to Iceland (Bayes Factor (BF)= 110,622),
Northeastern USA to Iceland (BF= 414.87), and Iceland to northeastern
Canada and Greenland (BF= 127.22). Arrows signify directionality and
greater arrow width corresponds to higher BF support of phylogeographic
transitions between intracontinental geographic states. BFs for state
transitions between all global regions can be found in Supplementary
Table 4. Host migratory ranges for populations of shorebirds (yellow),
gulls (green), ducks (blue), and geese (red) were compiled from
individual species-specific shape files acquired from IUCN Red List
(IUCN, 2021). Species-specific migratory range maps can be found in the
Supplementary figure 7.