Table 3 Parameter estimation under the finite island model (FIM).

Model FIM	Median	Mode	0.025^a	0.975^a	Prior^b
SCD
N_anc	33,567	42,704	1604	62,242	U: 100–100,000
T_i	72,760	56,354	24,124	141,628	U: 100–200,000
Nm	52.85	47.17	38.80	109.77	U: 0.05–250
SID
N_anc	31,016	30,737	1571	86,026	U: 100–100,000
T_i	63,431	61,671	6095	163,634	U: 100–200,000
Nm	42.04	38.61	28.51	117.80	U: 0.05–250
Pooled dataset
N_anc	52,541	58,148	8176	84,492	U: 100–100,000
T_i	65,004	18,329	4255	176,692	U: 100–200,000
Nm	58.7	51.4	38.3	150.9	U: 0.05–250

N_anc: effective population size of the ancestral deme; T_i: time of the onset of the island (in generations); Nm: product of the effective population size N and the migration rate m for each deme; SCD: scatter dataset (9 individuals); SID: single deme dataset (11 individuals); pooled dataset: SCD + SID without shared samples (18 individuals).
^aUpper and lower limits of the 95% credible interval about the estimated mode.
^bU, uniform probability, in the range of the two values.

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