Cenozoic migration of a desert plant lineage across the North Atlantic

Autor(en)

Thomas Denk, Johannes Martin Bouchal, Tuncay H. Guner, Mario Coiro

Abstrakt

Previous palaeobotanical work concluded that Paleogene elements of the sclerophyllous subhumid vegetation of western Eurasia and western North America were endemic to these disjunct regions, suggesting that the southern areas of the Holarctic flora were isolated at that time. Consequently, molecular studies invoked either parallel adaptation to dry climates from related ancestors, or long-distance dispersal in explaining disjunctions between the two regions, dismissing the migration of dry-adapted lineages via land bridges as unlikely. We report Vauquelinia (Rosaceae), currently endemic to western North America, in Cenozoic strata of western Eurasia. Revision of North American fossils previously assigned to 101 Vauquelinia identified a single fossil-species of Vauquelinia and one of its close relative Kageneckia. We established taxonomic relationships of fossil -taxa using diagnostic character combinations shared with modern species and construct ed a time-calibrated phylogeny. The fossil record suggests that Vauquelinia, currently endemic to arid and sub-desert environments, originated under seasonally arid climates in the Eocene of western
North America and subsequently crossed the Paleogene North Atlantic land bridge (NALB) to Europe. This pattern is replicated by other sclerophyllous, dry-adapted and warmth-loving plants, suggesting that several of these taxa crossed the North Atlantic via the NALB during Eocene times.

Organisation(en)

Department für Botanik und Biodiversitätsforschung, Institut für Paläontologie

Externe Organisation(en)

Swedish Museum of Natural History, Istanbul University

Publikationsdatum

2022

ÖFOS 2012

105117 Paläobotanik, 106008 Botanik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/51805ff6-7b2c-4807-a24d-6d57a6de4990