Ongoing modification of Mediterranean Pleistocene sapropels mediated by prokaryotes

被引:115
作者
Coolen, MJL
Cypionka, H
Sass, AM
Sass, H
Overmann, J
机构
[1] Carl von Ossietzky Univ Oldenburg, Inst Chem Biol & Marine Environm, Paleomicrobiol Grp, D-26111 Oldenburg, Germany
[2] Royal Netherlands Inst Sea Res, Dept Biogeochem & Toxicol, NL-1797 SZ Den Hoorn, Netherlands
[3] Univ Munich, Inst Genet & Microbiol, D-80638 Munich, Germany
关键词
D O I
10.1126/science.1071893
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Late Pleistocene organic-rich sediments (sapropels) from the eastern Mediterranean Sea harbor unknown, metabolically active chemoorganotrophic prokaryotes. As compared to the carbon-lean intermediate layers, sapropels exhibit elevated cell numbers, increased activities of hydrolytic exoenzymes, and increased anaerobic glucose degradation rates, suggesting that microbial carbon substrates originate from sapropel layers up to 217,000 years old. 16 S ribosomal RNA gene analyses revealed that as-yet-uncultured green nonsulfur bacteria constitute up to 70% of the total microbial biomass. Crenarchaeota constitute a smaller fraction (on average, 16%). A slow but significant turnover of glucose could be detected. Apparently, sapropels are still altered by the metabolic activity of green nonsulfur bacteria and crenarchaeota.
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页码:2407 / 2410
页数:5
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