Seed dispersal innovations and ancient hybridization shaped the expansion of oak forests
In short: Researchers analyzing the genomes of the oak family (Fagaceae) found that innovations in seed dispersal triggered rapid diversification across the Northern Hemisphere. The study revealed that as these trees moved into new temperate habitats during the early Miocene, they frequently encountered and hybridized with other species. This process, known as introgression, may have helped drive the adaptation and expansion of lineages like white oaks across Eurasia.
By analyzing nuclear and plastid genomes, the researchers mapped major evolutionary events and ancient signatures of hybridization. The findings suggest that these genetic exchanges helped amplify diversity as species moved into newly available habitats. However, the study focuses on reconstructing ancient macroevolutionary patterns from genomic signatures, which involves interpreting complex historical events.
Why it matters: Ancient genetic mixing and new ways to spread seeds helped oaks dominate Northern Hemisphere forests.
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