Quantifying ecospace utilization and ecosystem engineering during the early Phanerozoic – the role of bioturbation and bioerosion

Luis Buatois*, Gabriela Mángano, Nic Minter, Kai Zhou, Max Wisshak, Mark Wilson, Ricardo Olea

*Corresponding author for this work

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Abstract

The Cambrian Explosion (CE) and the Great Ordovician Biodiversification Event (GOBE) are the two most important radiations in Paleozoic oceans. We quantify the role of bioturbation and bioerosion in ecospace utilization and ecosystem engineering using information from 1367 stratigraphic units. An increase in all diversity metrics is demonstrated for the Ediacaran-Cambrian transition, followed by a decrease in most values during the middle to late Cambrian, and by a more modest increase during the Ordovician. A marked increase in ichnodiversity and ichnodisparity of bioturbation is shown during the CE, and of bioerosion during the GOBE. Innovations took place first in offshore settings and later expanded into marginal-marine, nearshore, deep-water, and carbonate environments. This study highlights the unique significance of the Cambrian Explosion, despite its Ediacaran roots. Differences in infaunalization in offshore and shelf paleoenvironments favor the hypothesis of early Cambrian wedge-shaped oxygen minimum zones instead of a horizontally stratified ocean.
Original languageEnglish
Article numbereabb0618
Number of pages11
JournalScience Advances
Volume6
Issue number33
DOIs
Publication statusPublished - 14 Aug 2020

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