FIGURE 2.

Evolutionary history of semelparous mammals. (a) Inferred phylogeny of ten marsupials and the platypus (outgroup) based on whole‐coding sequences of 6090 1:1 orthologues. Blue numbers at nodes represent the estimated divergence time from present (million years ago; Ma) between lineages. Semelparous lineages are indicated in red. (b) Demography of the dasyurid subfamily Phascogalinae. Historical population sizes (N _e) were estimated using the pairwise sequentially Markovian coalescent (PSMC) method (Li & Durbin, 2011) and diploid genome sequences. The x‐axis shows the time before present in years on a log scale; the dashed grey line shows human arrival in Australia 59.3–65 ka (Clarkson et al., 2017); red dots indicate the extinction times of 15 species of Pleistocene Sahul (Saltre et al., 2016). The y‐axis shows N _e, with bootstrap estimates indicated by lighter lines. Plots were scaled using a mutation rate (μ) of 1.37 × 10⁻⁹ substitutions per nucleotide per generation and species‐specific generation times (g) of 1 year. Two Antechinus flavipes (coloured in orange and blue) and two Antechinus stuartii (in brown and black) individuals were interrogated. (c) Map showing the location (coloured circles) and elevation (m amsl; metres above sea level) of sampled dasyurids (see panel b)