Mechanisms of microbial carbon sequestration in the ocean – future research directions

Jiao, Nianzhi; Robinson, Carol; Azam, Farooq; Thomas, Helmuth; Baltar, Federico; Dang, Hongyue; Hardman-Mountford, Nick J.; Johnson, Martin; Kirchman, David L.; Koch, Boris P.; Legendre, Louis; Li, C; Liu, Jialin; Luo, Tingwei; Luo, Ya‐Wei; Mitra, Aditee; Romanou, Anastasia; Tang, Kai; Wang, Fudi; Cong, Zixiang; Zhang, R

doi:10.5194/bg-11-5285-2014

Cited by 196 publications

(114 citation statements)

References 199 publications

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“…On the other hand, POC degradation by surface-colonizing microorganisms may also release recalcitrant DOC (209), facilitating carbon sequestration by the microbial carbon pump mechanism ( Fig. 1) (272,(282)(283)(284)(285). DOC (up to 662 Pg C) forms the largest organic carbon pool in the modern ocean, and a substantial fraction (ϳ97%) of DOC consists of refractory and ultrarefractory molecules that persist for thousands of years in the marine environment (286).…”

Section: Impacts Of Surface-associated Microbiota On Ocean Carbon Seqmentioning

confidence: 99%

“…DOC (up to 662 Pg C) forms the largest organic carbon pool in the modern ocean, and a substantial fraction (ϳ97%) of DOC consists of refractory and ultrarefractory molecules that persist for thousands of years in the marine environment (286). The quantitative contributions of surface-associated microorganisms to the size and dynamics of the ocean's POC and DOC reservoirs and the influence of spatiotemporally different environmental conditions on surface-associated microbial processes and activities are still poorly understood, especially under anthropogenic perturbation and global change scenarios (16,(284)(285)(286). In-depth studies of the marine surface-associated microbiota are fundamental for a mechanistic and predictive understanding of the marine carbon cycle.…”

Section: Impacts Of Surface-associated Microbiota On Ocean Carbon Seqmentioning

confidence: 99%

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Microbial Surface Colonization and Biofilm Development in Marine Environments

Dang

Lovell

2016

Microbiol Mol Biol Rev

870

636

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SUMMARYBiotic and abiotic surfaces in marine waters are rapidly colonized by microorganisms. Surface colonization and subsequent biofilm formation and development provide numerous advantages to these organisms and support critical ecological and biogeochemical functions in the changing marine environment. Microbial surface association also contributes to deleterious effects such as biofouling, biocorrosion, and the persistence and transmission of harmful or pathogenic microorganisms and their genetic determinants. The processes and mechanisms of colonization as well as key players among the surface-associated microbiota have been studied for several decades. Accumulating evidence indicates that specific cell-surface, cell-cell, and interpopulation interactions shape the composition, structure, spatiotemporal dynamics, and functions of surface-associated microbial communities. Several key microbial processes and mechanisms, including (i) surface, population, and community sensing and signaling, (ii) intraspecies and interspecies communication and interaction, and (iii) the regulatory balance between cooperation and competition, have been identified as critical for the microbial surface association lifestyle. In this review, recent progress in the study of marine microbial surface colonization and biofilm development is synthesized and discussed. Major gaps in our knowledge remain. We pose questions for targeted investigation of surface-specific community-level microbial features, answers to which would advance our understanding of surface-associated microbial community ecology and the biogeochemical functions of these communities at levels from molecular mechanistic details through systems biological integration.

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Section: Impacts Of Surface-associated Microbiota On Ocean Carbon Seqmentioning

confidence: 99%

Section: Impacts Of Surface-associated Microbiota On Ocean Carbon Seqmentioning

confidence: 99%

Microbial Surface Colonization and Biofilm Development in Marine Environments

Dang

Lovell

2016

Microbiol Mol Biol Rev

870

636

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“…The refractory organic carbon pool is large and comparable to the atmospheric CO 2 reservoir (Hansell et al, 2009), but it will have little impact on the climate system on timescales of several hundreds of years, unless an imbalance between sources and sinks evolves. Although it has been speculated that such changes may occur under ocean acidification and eutrophication (Jiao et al, 2014), there is insufficient knowledge to account for the microbial carbon pump and the corresponding functional groups in ESMs. In addition, no evaluation of the relevance of this pump with respect to contemporary climate change exists yet.…”

Section: M1 -Biogeochemical Pumpsmentioning

confidence: 99%

Ideas and perspectives: climate-relevant marine biologically driven mechanisms in Earth system models

2017

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Abstract. The current generation of marine biogeochemical modules in Earth system models (ESMs) considers mainly the effect of marine biota on the carbon cycle. We propose to also implement other biologically driven mechanisms in ESMs so that more climate-relevant feedbacks are captured. We classify these mechanisms in three categories according to their functional role in the Earth system: (1) "biogeochemical pumps", which affect the carbon cycling; (2) "biological gas and particle shuttles", which affect the atmospheric composition; and (3) "biogeophysical mechanisms", which affect the thermal, optical, and mechanical properties of the ocean. To resolve mechanisms from all three classes, we find it sufficient to include five functional groups: bulk phyto-and zooplankton, calcifiers, and coastal gas and surface mat producers. We strongly suggest to account for a larger mechanism diversity in ESMs in the future to improve the quality of climate projections.

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“…Its reactivity and in particular its availability for breakdown by marine microbes is a key factor controlling in its lifetime in relation to degradation to 5 inorganic carbon (e.g. Jiao et al, 2014) and thus capacity for long-term carbon storage. A recent synthesis of DOC in continental shelf seas observes a strong relationship between distance from rivers and decreasing DOC concentration, with significant enrichment of DOC in nearshore waters relative to the open ocean, leading to inferred global DOM flux across the shelf break ranging between 7 and 29 Pg C yr-1 (Barrón and Duarte, 2015).…”

Section: Dissolved Organic Matter and The Continental Shelf Pumpmentioning

confidence: 99%

“…a change to more refractory DOM leading to accumulation in the marine system and subsequent net removal of carbon from the atmosphere. The bioavailability of DOM in shelf environments has been proposed to be linked to nutrient availability, with higher nutrient (specifically, nitrogen) availability leading to greater remineralisation of DOM which has low bioavailabiliy as a result of its high C:N ratio and thus a decrease in microbial carbon pump efficiency (Jiao et al, 2014).…”

Section: Dissolved Organic Matter and The Continental Shelf Pumpmentioning

confidence: 99%

Distribution and C / N stoichiometry of dissolved organic matter in the North Sea in summer 2011–12

Chaichana

Jickells

Johnson

2017

Preprint

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Abstract. We present the distribution and C:N stoichiometry of dissolved organic matter (DOM) in the North Sea in 2 summers (August 2011 and August 2012), with supporting data from the intervening winter (January 2012). This data demonstrates local variability superimposed on a general pattern of decreasing DOM with increasing salinity, suggesting 10 strong control over broad scale concentrations by mixing between riverine sources and the open North Atlantic. We observe differences in DOC and DON concentrations and gradients between the two summers, leading to an estimated 10-20 Tg difference in the DOM carbon inventory between the 2 years, which is of the same order as the annual uptake of atmospheric CO 2 by the North Sea system, and thus significant for the carbon budget of the North Sea. Differences were particularly pronounced in the bottom layer of the seasonally stratifying Northern North Sea, with higher DOC and lower DON in 2011 15 and lower C:N ratio and more moderate concentrations of DOC and DON in 2012. Using other data we consider the extent to which these differences in the concentrations and C:N ratio of DOM could be due to differences in the biogeochemistry or physical circulation in the 2 years, or a combination of both. We discuss the implications of these observations for the shelf sea carbon pump and the export of carbon rich organic matter off the shelf. 20

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Mechanisms of microbial carbon sequestration in the ocean – future research directions

Cited by 196 publications

References 199 publications

Microbial Surface Colonization and Biofilm Development in Marine Environments

Microbial Surface Colonization and Biofilm Development in Marine Environments

Ideas and perspectives: climate-relevant marine biologically driven mechanisms in Earth system models

Distribution and C / N stoichiometry of dissolved organic matter in the North Sea in summer 2011–12

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