Cited by 574Paleontology and Stratigraphy of FossilsProtist diversity and phylogenyEvolution and Paleontology Studies

The rise of algae in Cryogenian oceans and the emergence of animals

Brocks, Jochen J., Jarrett, Amber J. M., Sirantoine, Eva, Hallmann, Christian, Hoshino, Yosuke, Liyanage, Tharika·2017·Nature

Abstract

The transition from dominant bacterial to eukaryotic marine primary productivity was one of the most profound ecological revolutions in the Earth's history, reorganizing the distribution of carbon and nutrients in the water column and increasing energy flow to higher trophic levels. But the causes and geological timing of this transition, as well as possible links with rising atmospheric oxygen levels and the evolution of animals, remain obscure. Here we present a molecular fossil record of eukaryotic steroids demonstrating that bacteria were the only notable primary producers in the oceans before the Cryogenian period (720-635 million years ago). Increasing steroid diversity and abundance marks the rapid rise of marine planktonic algae (Archaeplastida) in the narrow time interval between the Sturtian and Marinoan 'snowball Earth' glaciations, 659-645 million years ago. We propose that the incumbency of cyanobacteria was broken by a surge of nutrients supplied by the Sturtian deglaciation. The 'Rise of Algae' created food webs with more efficient nutrient and energy transfers, driving ecosystems towards larger and increasingly complex organisms. This effect is recorded by the concomitant appearance of biomarkers for sponges and predatory rhizarians, and the subsequent radiation of eumetazoans in the Ediacaran period.

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Crossref · 10.1038/nature23457

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  • There are claims for the earliest reliable organic biomarkers for ancient eukaryotes around 800 Ma.

    “An equally intriguing possibility lies with claims for the earliest reliable organic biomarkers for ancient eukaryotes around 800 Ma (Brocks et al., 2016, 2017; Zumberge et al., 2020; and references cited therein)”
  • The interglacial between the Sturtian and Marinoan glaciations is the same interval that produced the earliest records of animals (sponges) and diversification among eukaryotes more generally, including emergence of the earliest predatory rhizarians.

    “The interglacial is the same interval that produced the earliest records of animals (sponges; Love et al., 2009; Love and Summons, 2015), as well as diversification among eukaryotes more generally, including emergence of the earliest predatory rhizarians (Brocks et al., 2017)—a group that includes radiolaria and foraminifera.”
  • Recent organic geochemical data suggest that bacteria continued to dominate primary production until the interglacial between the Sturtian and Marinoan glaciations starting at roughly 660 Ma, while other data indicate a proliferation of eukaryotes starting closer to 800-750 Ma.

    “Some recent organic geochemical data suggest that bacteria continued to dominate primary production until the interglacial between the Sturtian and Marinoan glaciations (Brocks et al., 2017) starting at roughly 660 Ma, while other data indicate a proliferation of eukaryotes starting closer to 800–750 Ma (Brocks et al., 2017; Brocks, 2018; Isson et al., 2018).”

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Authors
Brocks, J. J., Jarrett, A. J. M., Sirantoine, E., Hallmann, C., Hoshino, Y., & Liyanage, T.
Affiliations
  • Australian National University (AU)
  • University of Bremen (DE)
  • Max Planck Institute for Biogeochemistry (DE)
Corresponding author
Brocks, Jochen J.
Venue
Nature
Published
2017-08
Volume
548
Issue
7669
Pages
578-581
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2749763761
Cited by
574
References
42
Citations by year
2026: 48 · 2025: 59 · 2024: 57 · 2023: 66 · 2022: 68 · 2021: 80 · 2020: 69 · 2019: 62 · 2018: 54 · 2017: 11
FWCI
38.24
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • ANU Open Research (Australian National University) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Publication Database GFZ (GFZ German Research Centre for Geosciences) (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Funders
  • Australian National University
  • Australian Research Council
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protist diversity and phylogeny
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
Keywords
Cryogenian, Ediacaran, molecular fossils, Archaeplastida, phytoplankton, Snowball Earth, Sturtian glaciation, Marinoan glaciation, cyanobacteria, atmospheric oxygen, food webs, origin of animals
MeSH terms
Cyanobacteria, Animals, Fossils, Oceans and Seas, Phosphorus, Biomarkers, Food Chain, Ice Cover, History, Ancient, Eukaryota, Carbon Cycle

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