Global distribution of microbial abundance and biomass in subseafloor sediment
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- Jens Kallmeyer
- Institut für Erd- und Umweltwissenschaften, Universität Potsdam, 14476 Potsdam, Germany;
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- Robert Pockalny
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02882
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- Rishi Ram Adhikari
- Institut für Erd- und Umweltwissenschaften, Universität Potsdam, 14476 Potsdam, Germany;
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- David C. Smith
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02882
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- Steven D’Hondt
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02882
書誌事項
- 公開日
- 2012-08-27
- DOI
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- 10.1073/pnas.1203849109
- 公開者
- Proceedings of the National Academy of Sciences
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説明
<jats:p> The global geographic distribution of subseafloor sedimentary microbes and the cause(s) of that distribution are largely unexplored. Here, we show that total microbial cell abundance in subseafloor sediment varies between sites by <jats:italic>ca.</jats:italic> five orders of magnitude. This variation is strongly correlated with mean sedimentation rate and distance from land. Based on these correlations, we estimate global subseafloor sedimentary microbial abundance to be 2.9⋅10 <jats:sup>29</jats:sup> cells [corresponding to 4.1 petagram (Pg) C and ∼0.6% of Earth’s total living biomass]. This estimate of subseafloor sedimentary microbial abundance is roughly equal to previous estimates of total microbial abundance in seawater and total microbial abundance in soil. It is much lower than previous estimates of subseafloor sedimentary microbial abundance. In consequence, we estimate Earth’s total number of microbes and total living biomass to be, respectively, 50–78% and 10–45% lower than previous estimates. </jats:p>
収録刊行物
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- Proceedings of the National Academy of Sciences
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Proceedings of the National Academy of Sciences 109 (40), 16213-16216, 2012-08-27
Proceedings of the National Academy of Sciences