Table 2

Isolation-with-migration estimates
Parameter estimates
Group/Species Ancestral Effective Population Size Ne [95%HPD] Effective Population Size Ne [95%HPD] Effective Number of Migrants into the population 2 Nm [95%HPD] Time Since Divergence T [95%HPD]
Absolute (millions of individuals) Absolute (millions of individuals) Absolute (migrant gene copies per generation) Absolute (in million years)
P. s. sundbergi + P. s. ladiguesis (northern) 0.600 [0.104-2.452] 1.826 [1.046-3.148] 1.584 [0.3513 – 3.59]** 0.536 [0.266-1.901]
P. sundbergi longisulae (southern) 3.584 [2.228-5.598] 0.0075 [0 – 1.995]
P. astriata astriata (northern) 0.296 [0.0014 – 0.868] 0.764 [0.424-1.280] 0.1311 [0 – 0.692] 0.580 [0.251-2.876]
P. astriata semicarinata (southern) 0.752 [0.390-1.436] 0.3910 [0 – 1.503] *
P. sundbergi 0.002 [0 – 2.408] 2.880 [2.143 – 3.737] 0.0006 [0 – 0.1763] 6.39 [4.264 – 8.297]
P. astriata 0.765 [0.564 – 1.035] 0.0003 [0 – 0.08]

Estimates and 95% highest posterior densities (HPD) of population sizes (θ), effective number of migrants (2 Nm) and time since divergence (T) between groups, as inferred with IMa2 (three different comparisons). Values for migration that are significantly different from zero [LLR test: * p-value <0.05; ** p-value <0.01, 82] are indicated with asterisk. A substitution rate of 1% per site per million years and a generation time of one year were assumed to convert the estimates into absolute quantities.

Rocha et al.

Rocha et al. BMC Evolutionary Biology 2013 13:3   doi:10.1186/1471-2148-13-3

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