Fig. 2.

The distribution of heterozygosity across the PPM genome reflects recent inbreeding. (A) Mean heterozygosity in 500 KB windows (points), sliding mean heterozygosity (lines), and runs of homozygosity (ROH > 1 MB; bars at top). (B) Total lengths of ROH in each 1 MB bin (for 1 MB < ROH < 67 MB). Hatched lines and corresponding labels show the approximate number of generations since inbreeding for ROH of a given size range, assuming 100 MB tracts are inherited per meiosis. (C) N_e over time, showing population decline at the beginning of the last glacial period followed by stable N_e ∼ 50,000. Lighter lines are replicate PSMC runs, and the dark line shows the mean of all replicates.