Fig. 3
Values of betweenness centrality in the (a) post-breeding and (b) pre-breeding migratory networks for blackpoll warblers and time-adjusted node weights in the (c) post-breeding and (d) pre-breeding migratory networks. Nodes with high betweenness centrality are located at the intersection of the shortest path between other nodes in the network. Nodes with high time-adjusted weight are expected to have a higher relative abundance of blackpoll warblers and are used for longer stopovers. The maps were generated in R using package sf version 1.0-16 (https://cran.r-project.org/web/packages/sf/), ggplot2 version 3.5.1 (https://ggplot2.tidyverse.org/), and lake and country polygons obtained from the Natural Earth dataset (www.naturalearthdata.com), via the naturalearth package version 1.0.1 (https://docs.ropensci.org/rnaturalearth/).
