DOI: 10.1002/2017JG004186
Scopus记录号: 2-s2.0-85042419796
论文题名: Necromass as a Limited Source of Energy for Microorganisms in Marine Sediments
作者: Bradley J.A. ; Amend J.P. ; LaRowe D.E.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 2 起始页码: 577
结束页码: 590
语种: 英语
英文关键词: energy
; geobiology
; marine sediment
; microbial ecology
; modeling
; necromass
英文摘要: The in situ production of necromass and its role as a power source in sustaining heterotrophic microorganisms in marine sediments has never been quantified. Here we quantify the power availability from necromass oxidation to living microorganisms buried in marine sediments over millions of years, first in the oligotrophic South Pacific Gyre (SPG) and second on a global scale. We calculate that power from autochthonously produced necromass in the upper meter of sediment underlying SPG provides only a small fraction (~0.02%) of the maintenance power demand of the living community (1.9 × 10−19 W cell−1). Power from necromass oxidation diminishes considerably with increasing sediment depth (and thus sediment age). Alternatively, the oxidation of allochthonous organic matter, and of radiolytic H2, provides power equivalent to or in excess of the maintenance demands of living microorganisms at SPG. On a global scale, necromass may support the maintenance power demand of 2 to 13% of the microbial community in relatively young sediments (<10,000 years) when it is oxidized with SO4 2− and O2, respectively. However, in older sediments, the power supplied by necromass is negligible (<0.01%). Nevertheless, the oxidation of a single dead cell per year provides sufficient power to support the maintenance demands of dozens to thousands of cells in low-energy marine sediments. This raises the possibility that the production and oxidation of necromass may provide a mechanism for non-growing microorganisms to endure unfavorable, low-energy settings over geological timescales. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114547
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States; Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States
Recommended Citation:
Bradley J.A.,Amend J.P.,LaRowe D.E.. Necromass as a Limited Source of Energy for Microorganisms in Marine Sediments[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(2)