Integrating palaeontological and molecular data uncovers multiple ancient and recent dispersals in the pantropical Hamamelidaceae

作  者:Xiang XG, Xiang KL, Ortiz RD, Jabbour F, Wang W*
影响因子:3.884
刊物名称:Journal of Biogeography
出版年份:2019
卷:  期:  页码:DOI: 10.1111/jbi.13690

论文摘要:

Aim

The integration of palaeontological and phylogenetic data can improve our understanding in the spatiotemporal evolutionary processes of living organisms. However, how best to use fossil data in divergence time estimation and ancestral range reconstruction remains challenging. Here, we integrated palaeontological and molecular data to investigate the historical biogeography of Hamamelidaceae, a pantropical angiosperm family with abundant fossils outside its present distribution.

Location

Global tropical/subtropical areas.

Methods

Using seven DNA regions (>7,500 bp) from plastid and nuclear genomes, we reconstructed a robust phylogenetic framework for Hamamelidaceae with the first complete genuslevel sampling. We used the tipdating method with the 22 fossils to estimate divergence times for the family, and inferred the ancestral range of lineages under the dispersal–extinction–cladogenesis model by incorporating the fossils.

Results

Our biogeographic analysis indicates that extant Hamamelidaceae most likely originated in tropical Asia during the midCretaceous, and in the family 20 dispersals occurred during three major time intervals: the Upper Cretaceous (c. 93–69 Ma), Palaeocene–Eocene (c. 63–39 Ma) and late Oligocene (c. 27–23 Ma).

Main conclusions

Overland migrations through available land bridges and island chains may have been mainly responsible for hamamelidaceous range expansions during these three episodes. This study contributes to our knowledge on the assembly and evolution of angiospermdominated tropical and subtropical forests.

全文链接:https://onlinelibrary.wiley.com/doi/full/10.1111/jbi.13690