Figure legends
FIGURE 1. Introductory figure with data from the Australian Monsoonal Tropics (AMT). A) Map with elevation, rivers, and evapotranspiration, highlighting the location of the three principal regions — Kimberley, Top End and Cape York; B) Average monthly temperature (in degrees Celsius) and rainfall (in millimetres) values for the AMT region; and C) Generalized linear model between clade depth (based on number of substitutions of ultrametric mtDNA trees) and clade distribution area (logkm2 values) for the four lizard genera included in the paper. This includes all known lineages present east of the Gulf break. Colours represent different lizard clade. Symbols represent different habitat preferences.
FIGURE 2. Species structure analysis for the AMT skink lizard cladeCarlia amax , where A) Isolation by distance plot; B) Principal Coordinate Analysis; C) ConStruct analysis and D)FastStructure analysis. Colours represent three distinct species found in our dataset across all analyses.
FIGURE 3. Isolation by distance graphs plotted across taxa (skinks, geckos and agamids), same environmental condition (using mean annual rainfall as a proxy; see Methods for more details) and habitat requirements (rock specialists vs. generalists). Higher values show stronger IBD relationship. Slopes represent the uncertainty (width) along the slope IBD estimate, where the circle is the point estimate.
FIGURE 4. Regression plot of mean lineage distribution area and clade age against observed heterozygosity (Ho ), Tajima’s D values and isolation by distance (IBD) slope values. Colours represent different lizard clade groups. Symbols represent different habitat preferences. Significance values are indicated for each regression.