Massive Expansion of Marine Archaea During a Mid-Cretaceous Oceanic Anoxic Event

Biogeochemical and stable carbon isotopic analysis of black-shale sequences deposited during an Albian oceanic anoxic event (∼112 million years ago) indicate that up to 80 weight percent of sedimentary organic carbon is derived from marine, nonthermophilic archaea. The carbon-13 content of archaeal molecular fossils indicates that these archaea were living chemoautotrophically. Their massive expansion may have been a response to the strong stratification of the ocean during this anoxic event. Indeed, the sedimentary record of archaeal membrane lipids suggests that this anoxic event marks a time in Earth history at which certain hyperthermophilic archaea adapted to low-temperature environments.

[1]  E. Delong,et al.  Archaeal dominance in the mesopelagic zone of the Pacific Ocean , 2001, Nature.

[2]  R. Norris,et al.  Increased thermohaline stratification as a possible cause for an ocean anoxic event in the Cretaceous period , 2001, Nature.

[3]  Stefan Schouten,et al.  Widespread occurrence of structurally diverse tetraether membrane lipids: evidence for the ubiquitous presence of low-temperature relatives of hyperthermophiles. , 2000, Proceedings of the National Academy of Sciences of the United States of America.

[4]  Stefan Schouten,et al.  Analysis of intact tetraether lipids in archaeal cell material and sediments by high performance liquid chromatography/atmospheric pressure chemical ionization mass spectrometry. , 2000, Rapid communications in mass spectrometry : RCM.

[5]  R. Pancost,et al.  A large and abrupt fall in atmospheric CO2 concentration during Cretaceous times , 1999, Nature.

[6]  E. Delong,et al.  Dibiphytanyl Ether Lipids in Nonthermophilic Crenarchaeotes , 1998, Applied and Environmental Microbiology.

[7]  Stefan Schouten,et al.  Recognition of n-alkyl and isoprenoid algaenans in marine sediments by stable carbon isotopic analysis of pyrolysis products of kerogens , 1998 .

[8]  Stefan Schouten,et al.  A newly discovered norisoprenoid, 2,6,15,19-tetramethylicosane, in Cretaceous black shales , 1998 .

[9]  Stefan Schouten,et al.  Ether lipids of planktonic archaea in the marine water column , 1997, Applied and environmental microbiology.

[10]  Stefan Schouten,et al.  Is there evidence for a substantial contribution of prokaryotic biomass to organic carbon in Phanerozoic carbonaceous sediments , 1997 .

[11]  R. Huber,et al.  2,6,10,15,19-Pentamethylicosenes in Methanolobus bombayensis, a marine methanogenic archaeon, and in Methanosarcina mazei , 1997 .

[12]  G. Ourisson,et al.  HOPANOIDS. I: GEOHOPANOIDS : THE MOST ABUDANT NATURAL PRODUCTS ON EARTH ? , 1992 .

[13]  R. Larson.  Latest pulse of Earth: Evidence for a mid-Cretaceous superplume , 1991 .

[14]  W. Dean,et al.  Geochemical and climatic effects of increased marine organic carbon burial at the Cenomanian/Turonian boundary , 1988, Nature.

[15]  W. Dean,et al.  Anomalous 13C enrichment in modern marine organic carbon , 1985, Nature.

[16]  William D. Grant,et al.  Extremophiles : microbial life in extreme environments , 1998 .

[17]  J. Fuhrman,et al.  Dominance of bacterial biomass in the Sargasso Sea and its ecological implications , 1989 .

[18]  M. Rosa,et al.  The lipids of archaebacteria. , 1988, Progress in lipid research.

[19]  T. Bralower,et al.  Organic carbon and metal accumulation rates in Holocene and mid-Cretaceous sediments: palaeoceanographic significance , 1987, Geological Society, London, Special Publications.

[20]  J. Volkman.  A review of sterol markers for marine and terrigenous organic matter , 1986 .