10.5061/DRYAD.T281K
Amorim, C. E. G.
Columbia University
Hofer, T
University of Bern
Ray, N
University of Geneva
Foll, M
International Agency For Research On Cancer
Ruiz-Linares, A
University College London
Excoffier, L
University of Bern
Data from: Long-distance dispersal suppresses introgression of local
alleles during range expansions
Dryad
dataset
2016
Homo Sapiens
interbreeding
Barriers to gene flow
2016-07-20T15:08:34Z
2016-07-20T15:08:34Z
en
https://doi.org/10.1038/hdy.2016.68
9737 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
During range expansions, even low levels of interbreeding can lead to
massive introgression of local alleles into an invader's genome.
Nonetheless, this pattern is not always observed in human populations. For
instance, European Americans in North America are barely introgressed by
Amerindian genes in spite of known contact and admixture. With coalescent
spatially explicit simulations, we examined the impact of long-distance
dispersal (LDD) events on introgression of local alleles into the invading
population using a set of different demographic scenarios applicable to a
diverse range of natural populations and species. More specifically, we
consider two distinct LDD models: one where LDD events originate in the
range core and targets only the expansion front and a second one where LDD
events can occur from any area to any other. We find that LDD generally
prevents introgression, but that LDD events specifically targeting the
expansion front are most efficient in suppressing introgression. This is
likely due to the fact that LDD allows for the presence of a larger number
of invader alleles at the wave front, where effective population size is
thus increased and local introgressed alleles are rapidly outnumbered. We
postulate that the documented settlement of pioneers directly on the wave
front in North America has contributed to low levels of Amerindian
admixture observed in European Americans and that this phenomenon may well
explain the lack of introgression after a range expansion in natural
populations without the need to evoke other mechanisms such as natural
selection.
Inputs and executables for simulationsInputs and executables for
simulationsinputs.zip
South America
North America