Evolutionary model of the demographic history of two groups of populations corresponding to the Central and Eastern mtDNA evolutionary lineages of the common vole Microtus arvalis. An ancestral population of size NA diverges into the two population groups TDIV generations ago. We assumed a continent-island model for each of the two population groups. Islands (numbered subscripts) represent populations from which genetic data is available and the continents (subscripts "Eastern" and "Central") represent collectively all unsampled populations from a given evolutionary lineage. We further assumed the population sizes of the continents (NCentral and NEastern) to be large (107 individuals) and the population sizes of the islands (N1, N2, N3, etc.) to follow a Normal distribution with mean N and standard deviation σN. Note that only four out of the 11 islands are shown. Backward in time, migration was only allowed from islands to the continent at rates Nm. While the same demographic model was assumed for both marker types, population sizes and migration rates were scaled differently (see text).
Wegmann et al. BMC Bioinformatics 2010 11:116 doi:10.1186/1471-2105-11-116