Ancient gene flow shapes phylogenetic discordance in a genus of wood-warblers (Aves: Parulidae: Leiothlypis)

Key Points

• Phylogenetic discordance arises due to ancient gene flow among species.
• Evidence shows widespread gene flow shaping the evolutionary history across wood-warbler lineages.
• Genomic analysis was used to explore lineage relationships within the genus Leiothlypis.
• This highlights the complexity of speciation processes and adds nuance to understanding evolution.