气候变化领域集成服务门户(CCPortal): Survival of the fewest: Microbial dormancy and maintenance in marine sediments through deep time

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DOI	10.1111/gbi.12313
	Survival of the fewest: Microbial dormancy and maintenance in marine sediments through deep time
	Bradley J.A.; Amend J.P.; LaRowe D.E.
发表日期	2019
ISSN	14724677
起始页码	43
结束页码	59
卷号	17 期号:1
英文摘要	Microorganisms buried in marine sediments are known to endure starvation over geologic timescales. However, the mechanisms of how these microorganisms cope with prolonged energy limitation is unknown and therefore yet to be captured in a quantitative framework. Here, we present a novel mathematical model that considers (a) the physiological transitions between the active and dormant states of microorganisms, (b) the varying requirement for maintenance power between these phases, and (c) flexibility in the provenance (i.e., source) of energy from exogenous and endogenous catabolism. The model is applied to sediments underlying the oligotrophic South Pacific Gyre where microorganisms endure ultra-low fluxes of energy for tens of millions of years. Good fits between model simulations and measurements of cellular carbon and organic carbon concentrations are obtained and are interpreted as follows: (a) the unfavourable microbial habitat in South Pacific Gyre sediments triggers rapid mortality and a transition to dormancy; (b) there is minimal biomass growth, and organic carbon consumption is dominated by catabolism to support maintenance activities rather than new biomass synthesis; (c) the amount of organic carbon that microorganisms consume for maintenance activities is equivalent to approximately 2% of their carbon biomass per year; and (d) microorganisms must rely solely on exogenous rather than endogenous catabolism to persist in South Pacific Gyre sediments over long timescales. This leads us to the conclusion that under oligotrophic conditions, the fitness of an organism is determined by its ability to simply stay alive, rather than to grow. This modelling framework is designed to be flexible for application to other sites and habitats, and thus serves as a new quantitative tool for determining the habitability of and an ultimate limit for life in any environment. © 2018 The Authors. Geobiology Published by John Wiley & Sons Ltd.
关键词	bioenergetics catabolism dormancy gyre marine sediment microbial community numerical model oligotrophic environment physiological response survival Pacific Ocean Pacific Ocean (South)carbon aquatic species biological model biomass ecosystem metabolism microbiology microflora Pacific Ocean physiology sediment Aquatic Organisms Biomass Carbon Ecosystem Geologic Sediments Microbiota Models, Biological Pacific Ocean
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133257
推荐引用方式 GB/T 7714	Bradley J.A.,Amend J.P.,LaRowe D.E.. Survival of the fewest: Microbial dormancy and maintenance in marine sediments through deep time[J]. Geobiology,2019,17(1).
APA	Bradley J.A.,Amend J.P.,&LaRowe D.E..(2019).Survival of the fewest: Microbial dormancy and maintenance in marine sediments through deep time.,17(1).
MLA	Bradley J.A.,et al."Survival of the fewest: Microbial dormancy and maintenance in marine sediments through deep time".17.1(2019).