Phylogenomic conflict resulting from ancient introgression following species diversification in Stewartia s.l. (Theaceae)

Molecular Phylogenetics and Evolution
Han-Yang LinYun-Peng Zhao

Abstract

Phylogenetic analyses using diverse datasets can yield conflicting inference of evolutionary history. Phylogenetic conflicts observed in both animal and plant systems have often been explained by two competing (but not mutually exclusive) hypotheses, i.e., hybridization vs. incomplete lineage sorting (ILS). The likelihood of either process contributing to phylogenetic conflict in a given group is context-dependent, involving attributes of life history, distribution, and phylogeny, among others. Here we explore phylogenetic conflict in Stewartia s.l., a genus with ca. 20 species of trees and shrubs from the tea family (Theaceae) disjunctly distributed between eastern Asia (EAS) and eastern North America (ENA). We use both restriction-site associated DNA sequencing (RAD-seq) and complete plastome sequence data to reconstruct the phylogeny of the group using concatenation and coalescence approaches. Our results indicate strong conflicts between the topologies reconstructed using nuclear and plastid data. Four-taxon D-statistic (ABBA-BABA) tests detected prevailing signals of introgression. Bayesian Analysis of Macro-evolutionary Mixtures (BAMM) inferred that species diversification occurred in the middle to late Miocene. Ancestral...Continue Reading

Citations

Oct 13, 2019·Molecular Phylogenetics and Evolution·Hong-Xin WangHua-Feng Wang
Mar 30, 2021·Plant Diversity·Changkun LiuYunheng Ji
May 30, 2021·BMC Ecology and Evolution·Xiu-Lian CaiHua-Feng Wang
Jun 11, 2021·Systematic Biology·Yujing YanMichael Krabbe Borregaard
Sep 2, 2021·Systematic Biology·Tauana Junqueira CunhaGonzalo Giribet

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