| Registro completo |
| Provedor de dados: |
ArchiMer
|
| País: |
France
|
| Título: |
Bisnorgammacerane traces predatory pressure and the persistent rise of algal ecosystems after Snowball Earth
|
| Autores: |
Van Maldegem, Lennart M.
Sansjofre, Pierre
Weijers, Johan W. H.
Wolkenstein, Klaus
Strother, Paul K.
Woermer, Lars
Hefter, Jens
Nettersheim, Benjamin J.
Hoshino, Yosuke
Schouten, Stefan
Damste, Jaap S. Sinninghe
Nath, Nilamoni
Griesinger, Christian
Kuznetsov, Nikolay B.
Elie, Marcel
Elvert, Marcus
Tegelaar, Erik
Gleixner, Gerd
Hallmann, Christian
|
| Data: |
2019-01
|
| Ano: |
2019
|
| Resumo: |
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.
|
| Tipo: |
Text
|
| Idioma: |
Inglês
|
| Identificador: |
https://archimer.ifremer.fr/doc/00637/74951/76030.pdf
https://archimer.ifremer.fr/doc/00637/74951/76031.pdf
https://archimer.ifremer.fr/doc/00637/74951/76032.pdf
https://archimer.ifremer.fr/doc/00637/74951/76033.pdf
https://archimer.ifremer.fr/doc/00637/74951/76034.xlsx
DOI:10.1038/s41467-019-08306-x
https://archimer.ifremer.fr/doc/00637/74951/
|
| Editor: |
Nature Publishing Group
|
| Formato: |
application/pdf
|
| Fonte: |
Nature Communications (2041-1723) (Nature Publishing Group), 2019-01 , Vol. 10 , P. 476 (11p.)
|
| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
|
|
