FST in a hierarchical island model
Slatkin, M.; Voelm, L.
Genetics 127(3): 627-629
1991
ISSN/ISBN: 0016-6731 PMID: 2016058 Document Number: 386537
The population genetic consequences of a species having a hierarchical population structure are described. It is shown that in a hierarchical island model, in which demes within a neighbourhood exchange migrants at a much higher rate than do demes in different neighbourhoods, hierarchical F statistics introduced by S. Wright can indicate the extent of gene flow within and between neighbourhoods. At equilibrium, the within-neighbourhood inbreeding coefficient, FSN, is approx. 1/(1 + 4Nm1), where N is the deme size and m1 is the migration rate among demes in the same neighbourhood. The between-neighbourhood inbreeding coefficient, FNT, is approx. 1/(1 + 4Ndm2), where d is the number of demes in a neighbourhood and m2 is the migration rate among demes in different neighbourhoods.