America bottleneck cheetah dating genetic primary source ps1 dating rpg

a–c Optimal phylogenetic placement of hybrid samples onto our non-admixed RAx ML topology (see also Supplementary Fig.5) based on f4-statistics fitting in Admixture Graph.With expanded genomic coverage, we test for signatures of refugial divergence and introgression, characterize the timing of introgression events relative to climatic oscillations, and infer the impact of introgressive hybridization on divergence across the complex landscape of northwestern North America.To test our hypothesis that the four mitochondrial stoat lineages originated as the result of isolation and divergence in each of the four major North American refugia, we generated whole-genome sequences for ten M.Although often difficult to parse introgression from incomplete lineage sorting in closely related taxa or lineages, investigations of divergent lineages, such as those within the M.erminea complex, provide insight into the genomic consequences of introgression.a PCA with all samples demonstrates substantial nuclear genetic differentiation of the West clade.

Upon glacial recession, populations subsequently expand and often come into contact with other independently diverging populations, resulting in gene flow.

Phylogeography of high-latitude Mustela erminea, the stoat or ermine (Family: Mustelidae) delineates four genetically distinct mitochondrial lineages geographically corresponding to these four refugia.

Although glacial isolation appears to have impacted the long-term evolution of this mammalian meso-carnivore, the effects of glacial recession and subsequent secondary contact between refugial lineages remain unexplored.

In some cases, admixture occurred upon secondary contact with other lineages. erminea experienced serial bouts of climate-mediated introgression, a repeated signature of introgressive hybridization should be evident in the genomes of refugial descendants now being explored on a genomic scale.

We define introgressive hybridization as interbreeding and the movement of alleles between two genetically distinct lineages.

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