Data S1. Methods

Table S1. Point locality data used to model the geographic distribution of subspecies cinerea and coryphaeus.

Table S2. Parameters and priors used for each of the scenarios simulated under the ABC framework. Mutation rates were sampled from a uniform distribution: autosomal introns [1 × 10−9–1 × 10−7], Z-linked locus [1 × 10−9–1 × 10–8], and microsatellites [1 × 10−4−1 × 10−3].

Table S3: Likelihood ratio test of nested models of divergence in isolation (m1 =  m2 = 0). m1 = migration from cinerea into coryphaeus; m2 = migration from coryphaeus into cinera.

Figure S1. Summary of the results obtained with the two most commonly used tests statistics implemented to detect departures from the constant population size model: Tajima's D and Fu's Fs. Suffix TD and Fs after locus name denote the test statistics, Tajima's D and Fu's Fs, respectively. Actual values of the summary statistic are reported in Table 1.

Figure S2. Allele frequency spectra for cinerea (red), coryphaeus (blue), and overall (green) for each nuclear locus are analyzed. ‘O’ and ‘E’ denote the observed variation and the variation expected under a model of stable population size, respectively.

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