Cited by 83Paleontology and Stratigraphy of FossilsEvolution and Paleontology StudiesPaleontology and Evolutionary Biology

Early Palaeozoic diversifications and extinctions in the marine biosphere: a continuum of change

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Harper, David A.T., Cascales-Miñana, Borja, Servais, Thomas·2020·Geological Magazine

Abstract

A review of biodiversity curves of marine organisms indicates that, despite fluctuations in amplitude (some large), a large-scale, long-term radiation of life took place during the early Palaeozoic Era; it was aggregated by a succession of more discrete and regionalized radiations across geographies and within phylogenies. This major biodiversification within the marine biosphere started during late Precambrian time and was only finally interrupted in the Devonian Period. It includes both the Cambrian Explosion and the Great Ordovician Biodiversification Event. The establishment of modern marine ecosystems took place during a continuous chronology of the successive establishment of organisms and their ecological communities, developed during the ‘Cambrian substrate revolution’, the ‘Ordovician plankton revolution’, the ‘Ordovician substrate revolution’, the ‘Ordovician bioerosion revolution’ and the ‘Devonian nekton revolution’. At smaller scales, different regional but important radiations can be recognized geographically and some of them have been identified and named (e.g. those associated with the ‘Richmondian Invasion’ during Late Ordovician time in Laurentia and the contemporaneous ‘Boda event’ in parts of Europe and North Africa), in particular from areas that were in or moved towards lower latitudes, allowing high levels of speciation on epicontintental seas during these intervals. The datasets remain incomplete for many other geographical areas, but also for particular time intervals (e.g. during the late Cambrian ‘Furongian Gap’). The early Palaeozoic biodiversification therefore appears to be a long-term process, modulated by bursts in significant diversity and intervals of inadequate data, where its progressive character will become increasingly clearer with the availability of more complete datasets, with better global coverage and more advanced analytical techniques.

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Crossref · 10.1017/s0016756819001298

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  • Many other fossil groups demonstrate different scenarios, with the two distinct Cambrian and Ordovician radiations largely invisible.

    “On the other hand, many other groups demonstrate different scenarios, with the two distinct Cambrian and Ordovician radiations largely invisible (Harper et al., 2020).”

    From No (Cambrian) explosion and no (Ordovician) event: A single long-term radiation in the early Palaeozoic (2023) · cites this paper as Harper et al., 2020

    In “The early Palaeozoic radiation” (page unavailable), the paper says individual fossil groups show different diversity trends and that the Cambrian Explosion is visible for some groups but not all. It also describes Ordovician biodiversity as a sum of radiations occurring at different times and intensities. That supports the differing scenarios, but not the stronger claim that both distinct radiations are largely invisible in many groups. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • None of the available datasets is complete in terms of palaeocontinental coverage.

    “It became obvious that none of the available datasets is complete in terms of palaeocontinental coverage.”

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Cites

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Research works printed but not linked: 7

  1. Brenchley PJ, Carden GA, Kaljo D, Marshall J, Martma T, Meidla T and Nõlvak J (2003) High-resolution stable isotope stratigraphy of Upper Ordovician sequences: constraints on the timing of bioevents and environ- mental changes associated with mass extinction and glaciation. GSA Bulletin 115, 89-104.
  2. Cooper RA (2004) Measures of diversity. In The Great Ordovician Biodiversification Event (eds BD Webby, F Paris, ML Droser and IG Percival), pp. 52-57. New York: Columbia University Press.
  3. Harper DAT and Rong JY (2001) Palaeozoic brachiopod extinctions and recoveries. Geological Journal 36, 317-28.
  4. Maletz J (2017) Graptolite Palaeobiology. Chichester: Wiley-Blackwell, 336 p.
  5. Rozhnov SV (2017) The beginning of the Ordovician evolutionary radiation in the Baltic Region: substrate revolution, explosive increase in diversity of stalked echinoderms, and the cyanobacterial origin of hardgrounds. In Filling the Gap between the Cambrian Explosion and the GOBE-IGCP Project 653: Annual Meeting 2017, Extended Summaries (eds YD Zhang, RB Zhan, JX Fan and LA Muir), pp. 133-9. Hangzhou: Zhejiang University Press.
  6. Shields GA, Veizer J (2004) Isotopic signatures. In The Great Ordovician Biodiversification Event (eds BD Webby, F Paris, ML Droser and IG Percival), pp. 68-71. New York: Columbia University Press.
  7. Webby BD (2004) Introduction. In The Great Ordovician Biodiversification Event (eds BD Webby, F Paris, ML Droser and IG Percival), pp. 1-37. New York, NY: Columbia University Press.

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Authors
Harper, D. A. T., Cascales-Miñana, B., & Servais, T.
Affiliations
  • Durham University (GB)
  • Centre National de la Recherche Scientifique (FR)
Corresponding author
Harper, David A.T.
Venue
Geological Magazine
Published
2019-12-03
Volume
157
Issue
1
Pages
5-21
ISSN
  • 0016-7568 (ISSN-L)
  • 1469-5081
OpenAlex
W2992068687
Cited by
83
References
134
Citations by year
2026: 15 · 2025: 13 · 2024: 3 · 2023: 25 · 2022: 14 · 2021: 11 · 2020: 2
FWCI
5.13
Type
journal article
Language
en
Open access
Locations
  • Geological Magazine (publishedVersion)
  • Durham Research Online (Durham University) (acceptedVersion, cc-by-nc-nd)
  • Durham Research Online (Durham University) (submittedVersion, cc-by-nc-nd)
  • HAL (submittedVersion, other-oa)
  • LillOA (Université de Lille (University Of Lille)) (submittedVersion, other-oa)
Funders
Leverhulme Trust
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
Keywords
Lower Paleozoic, marine biodiversity, diversification, extinction, Cambrian explosion, Great Ordovician Biodiversification Event, Precambrian, Devonian, bioerosion, nekton, epicontinental sea, speciation, Laurentia

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