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Revisiting the Great Ordovician diversification of land plants : recent data and perspectives.

Servais, Thomas and Cascales-Miñana, Borja and Cleal, Christopher J. and Gerrienne, Philippe and Harper, David A.T. and Neumann, Mareike (2019) 'Revisiting the Great Ordovician diversification of land plants : recent data and perspectives.', Palaeogeography, Palaeoclimatology, Palaeoecology, 534 . p. 109280.

Abstract

Recent molecular clock data suggest with high probability a Cambrian origin of Embryophyta (also called land plants), indicating that their terrestrialization most probably started about 500 Ma. The fossil record of the ‘Cambrian Explosion’ was limited to marine organisms and not visible in the plant fossil record. The most significant changes in early land plant evolution occurred during the Ordovician. For instance, the earliest bryophyte-like cryptospores and the oldest fragments of the earliest land plants are from the Middle and Late Ordovician, respectively. Organic geochemistry studies on biomarker compositions hint at a transition from green algae to land plants during the ‘Great Ordovician Biodiversification Event’ (GOBE). The colonization of the terrestrial realms by land plants clearly had an impact on marine ecosystems. Interactions between the terrestrial and marine biospheres have been proposed and the radiation of land plants potentially impacted on CO2 and O2 concentrations and on global climate. In addition, the shift of strontium isotopes during the Ordovician is probably linked to changing terrestrial landscapes, affected by the first massive land invasion of eukaryotic terrestrial life. The land plants seem unaffected by the first global mass extinction at the end of the Ordovician that eliminated many marine invertebrate taxa.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.palaeo.2019.109280
Publisher statement:© 2019 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Date accepted:19 July 2019
Date deposited:03 February 2020
Date of first online publication:04 August 2019
Date first made open access:02 August 2020

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