population expansion
Browning SR, Browning BL, Daviglus ML, Durazo-Arvizu RA, Schneiderman N, Kaplan RC & Laurie CC 2018 Ancestry-specific recent effective population size in the Americas. PLoS Genet 14:e1007385.
- we use identity by descent and local ancestry inferred from genome-wide genetic data to estimate overall and ancestry-specific effective population size during the past hundred generations for nine admixed American populations
- overall effective population sizes dropped substantially in the generations immediately after the commencement of European and African immigration, reaching a minimum around 12 generations ago
- in modern human populations with low levels of immigration, the overall effective population size tends to be around one-third of the census size, largely because the generation time is approximately one-third of the expected lifespan
- our pre-admixture model is based on a published model inferred from the 1000 Genomes project data [18]
- the initial population size (in Africa) was 7310
- which increased 5920 generations ago to 14474
- the out of Africa event occurred 2040 generations ago, with the out-of-Africa population size being 1861
- the Asian and European populations split from the out-of-Africa population 920 generations ago, with sizes of 1032 for Europe and 554 for Asia
- growth rates of 3.8 × 10−3 for Europe
- 4.8 × 10−3 for Asia