Early Palaeozoic ocean anoxia and global warming driven by the evolution of shallow burrowing

Early Palaeozoic ocean anoxia and global warming driven by the evolution of shallow burrowing

Van De Velde, Sebastiaan (Vrije Universiteit Brussel; Universiteit Antwerpen)
Mills, Benjamin J.W. (University of Leeds)
Meysman, F.J.R. (TU Delft BT/Environmental Biotechnology; Universiteit Antwerpen)
Lenton, Timothy M. (University of Exeter)
Poulton, Simon W. (University of Leeds)

2018-12-01

The evolution of burrowing animals forms a defining event in the history of the Earth. It has been hypothesised that the expansion of seafloor burrowing during the Palaeozoic altered the biogeochemistry of the oceans and atmosphere. However, whilst potential impacts of bioturbation on the individual phosphorus, oxygen and sulphur cycles have been considered, combined effects have not been investigated, leading to major uncertainty over the timing and magnitude of the Earth system response to the evolution of bioturbation. Here we integrate the evolution of bioturbation into the COPSE model of global biogeochemical cycling, and compare quantitative model predictions to multiple geochemical proxies. Our results suggest that the advent of shallow burrowing in the early Cambrian contributed to a global low-oxygen state, which prevailed for ~100 million years. This impact of bioturbation on global biogeochemistry likely affected animal evolution through expanded ocean anoxia, high atmospheric CO₂ levels and global warming.

http://resolver.tudelft.nl/uuid:45f0dd9a-b24f-4583-83cb-1551bf3c0a52

https://doi.org/10.1038/s41467-018-04973-4

2041-1723

Nature Communications, 9 (1)

Institutional Repository

journal article

© 2018 Sebastiaan Van De Velde, Benjamin J.W. Mills, F.J.R. Meysman, Timothy M. Lenton, Simon W. Poulton