Fig. 2: Genetic population structure, agent model dispersal behavior, and genetic relatedness results for muskrat in the delta.

a STRUCTURE results assign fractions of the ancestry of individual sampled muskrat (shown with vertical bars) to population 1 (purple) or population 2 (green), with individuals ordered by year and sample site. The vertical axis represents the fraction of ancestry from either population, ranging from 0 to 1. b Dispersal flux in the agent model, the number of dispersing individual muskrat traveling through a given location, is shown as the difference between dispersal flux in 2016 and 2015 for a portion of the delta encompassing genetic sample sites A through E. The map indicates locations of increased dispersal (blue), locations of decreased dispersal (red), and locations where the amount of dispersal is unchanged across the two years (white). Colored circles show genetic sampling site locations. Colors indicate the year of sampling according to the color scheme in Fig. 1b. Dispersal flux data shown here is the mean of n = 30 model realizations. c In each year, the number of muskrat sampled and the number of first order relationships. First order relationships are made up of pairs of individuals found within the same sampling site (gray) or pairs of individuals from different sampling sites (blue). d The per mil of first order relationships observed out of all possible relationships within (gray) or between (blue, along arrows) sampled sites in each year. Distances between sites are not to scale. Sites not sampled in a given year are grayed out.