Climate Networks among Wildlife Refuges
Network analysis investigates structures by identifying networks among component individuals (Otte and Rousseau 2002). Each individual is called a node and links are the relations between nodes (Cumming et al. 2010). Here, refuges are the nodes and we linked refuges using the relationships of climate space of each refuge. We used arrows to represent the directions of links. If an initial refuge node’s current climate space is found in other refuge nodes, those nodes are final nodes and the arrowheads point to the final nodes. The density of vectors is an indicator of the connectedness in the network (Otte and Rousseau 2002). We calculated the levels of connections for each refuge unit and the number of nodes from which climate departs or arrives can be found under future projections.
After mapping the temporal climate networks among refuges for each climate projection, we asked how many distinct types of climate connections could be identified. For the future-climate connections among refuges, we report on 2070-2099 in the main text, and see Table S2 for other future periods results.