ArticleNature communications2019
Bisnorgammacerane traces predatory pressure and the persistent rise of algal ecosystems after Snowball Earth.
Article in Nature communications, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Ecosystem relocation on Snowball Earth: Polar-alpine ancestry of the extant surface biosphere?Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Preservation of early Tonian macroalgal fossils from the Dolores Creek Formation, Yukon.Scientific reports · 2022Article
- Laboratory exploration of mineral precipitates from Europa's subsurface ocean.Journal of applied crystallography · 2021Article
- Modern dolomite formation caused by seasonal cycling of oxygenic phototrophs and anoxygenic phototrophs in a hypersaline sabkha.Scientific reports · 2021Article
- Geological alteration of Precambrian steroids mimics early animal signatures.Nature ecology & evolution · 2021Article
- Algal origin of sponge sterane biomarkers negates the oldest evidence for animals in the rock record.Nature ecology & evolution · 2021Article
- The origin of phagocytosis in Earth history.Interface focus · 2020Review
- Free and kerogen-bound biomarkers from late Tonian sedimentary rocks record abundant eukaryotes in mid-Neoproterozoic marine communities.Geobiology · 2020Article
- Food sources for the Ediacara biota communities.Nature communications · 2020Article
- Individual Microfossil δGeobiologyArticle
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Authors and funding
19 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Eukaryotic algae rose to ecological relevance after the Neoproterozoic Snowball Earth glaciations, but the causes for this consequential evolutionary transition remain enigmatic. Cap carbonates were globally deposited directly after these glaciations, but they are usually organic barren or thermally overprinted. Here we show that uniquely-preserved cap dolostones of the Araras Group contain exceptional abundances of a newly identified biomarker: 25,28-bisnorgammacerane. Its secular occurrence, carbon isotope systematics and co-occurrence with other demethylated terpenoids suggest a mechanistic connection to extensive microbial degradation of ciliate-derived biomass in bacterially dominated ecosystems. Declining 25,28-bisnorgammacerane concentrations, and a parallel rise of steranes over hopanes, indicate the transition from a bacterial to eukaryotic dominated ecosystem after the Marinoan deglaciation. Nutrient levels already increased during the Cryogenian and were a prerequisite, but not the ultimate driver for the algal rise. Intense predatory pressure by bacterivorous protists may have irrevocably cleared self-sustaining cyanobacterial ecosystems, thereby creating the ecological opportunity that allowed for the persistent rise of eukaryotic algae to global importance.
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