Genome-wide markers reveal a complex evolutionary history involving divergence and introgression in the Abert’s squirrel (Sciurus aberti) species group

Table 1 Migration edges inferred by TREEMIX and results of four population tests

Migration edge added	Migration weight in final model	Variance explained	F₄ Test Tree	Observed f₄	P-value
No migration	–	97.8%	–	–	–
kaibabensis - > aberti Coc-Gila	0.146	98.6%	(ferreus Pike, kaibabensis; chuscensis, aberti Coc-Gila)	0.01514	< 0.00001
ferreus Pike - > ferreus Carson E	0.303	99.3%	(ferreus Pike, chuscensis; ferreus Carson E, aberti San Juan)	0.01082	< 0.00001
equally related to ferreus Carson E, aberti Carson-SFW, aberti San Juan - > aberti Carson-SFW	0.279	99.6%	–
barberi - > aberti Coc-Gila	0.101	99.8%	(aberti Coc-Gila, chuscensis; barberi, ferreus Pike)	0.00706	< 0.00001
kaibabensis - > common ancestor of chuscensis, aberti MT-Zuni, and aberti Coc-Gila	0.030	99.9%	(barberi, kaibabensis; ferreus Pike, aberti MT-Zuni)	0.00156	0.0160
	0.030	99.9%	(barberi, kaibabensis; ferreus Pike, chuscensis)	0.00116	0.0720

ISSN: 2730-7182