1 | INTRODUCTION
Hybridization between species and admixture between populations are
powerful mechanisms influencing biological evolution. Genetic admixture
patterns have thus been extensively studied to
reconstruct past population
migrations and understand admixture-related adaptation such as heterosis
or post-admixture selection (Brandenburg
et al., 2017; Hellenthal et al., 2014;
Skoglund, Ersmark, Palkopoulou, & Dalen,
2015).
A long history of statistical developments in population genetics
provided tools to identify and describe admixture patterns from genetic
data (Bernstein, 1931;
Cavalli-Sforza & Bodmer, 1971;
Chakraborty & Weiss, 1988; Long 1991;
Falush, Stephens, & Pritchard, 2003;
Patterson et al., 2012), They enabled
inferring the ancestral origins of admixed populations or investigate
adaptive introgression in numerous species (e.g.
Martin et al., 2013;
Patin et al., 2017;
Stryjewski & Sorenson, 2017).