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Cenozoic migration of a desert plant lineage across the North Atlantic. | LitMetric

Cenozoic migration of a desert plant lineage across the North Atlantic.

New Phytol

Department of Earth Science and College of Creative Studies, University of California, Santa Barbara, CA, 93106, USA.

Published: June 2023

AI Article Synopsis

  • Previous studies indicated that certain dry-adapted plant elements in western Eurasia and North America were thought to be isolated from each other, leading to theories of parallel adaptation or long-distance dispersal.
  • New findings disclose that the genus Vauquelinia, mainly found in western North America, actually has fossils in western Eurasia, suggesting it migrated across the ancient North Atlantic land bridge.
  • The research confirms that Vauquelinia likely originated in Eocene North America and supports the idea that various dry-adapted plants may have crossed to Europe through this land bridge during the Paleogene period.

Article Abstract

Previous paleobotanical 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 contemporaneous 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 Vauquelinia confirmed 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 constructed a time-calibrated phylogeny. The fossil record suggests that Vauquelinia, currently endemic to arid and subdesert 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 potentially crossed the North Atlantic via the NALB during Eocene times.

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Source
http://dx.doi.org/10.1111/nph.18743DOI Listing

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