Activity and community structures of sulfate-reducing microorganisms in polar, temperate and tropical marine sediments

Robador, Alberto; Müller, Albert; Sawicka, Joanna; Berry, David; Hubert, Claude; Loy, Alexander; Jørgensen, Bo Barker; Brüchert, Volker

doi:10.1038/ismej.2015.157

Cited by 70 publications

(72 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…30–35%) (Leloup et al ., ; Leloup et al ., ). Available substrates and in situ temperatures are the key determinants of SRM community structure in sediment zones with sufficient sulfate (Robador et al ., ). Various SRM that are ecologically relevant in these marine sediment layers belong to the class Deltaproteobacteria , whereby members of the family Desulfobacteraceae are typically one of the most important taxonomic groups in terms of abundance and activity (Fig.…”

Section: Dissimilatory Sulfate Reductionmentioning

confidence: 97%

See 1 more Smart Citation

The life sulfuric: microbial ecology of sulfur cycling in marine sediments

Wasmund

Mußmann

Loy

2017

Environ Microbiol Rep

Self Cite

308

266

View full text Add to dashboard Cite

SummaryAlmost the entire seafloor is covered with sediments that can be more than 10 000 m thick and represent a vast microbial ecosystem that is a major component of Earth's element and energy cycles. Notably, a significant proportion of microbial life in marine sediments can exploit energy conserved during transformations of sulfur compounds among different redox states. Sulfur cycling, which is primarily driven by sulfate reduction, is tightly interwoven with other important element cycles (carbon, nitrogen, iron, manganese) and therefore has profound implications for both cellular‐ and ecosystem‐level processes. Sulfur‐transforming microorganisms have evolved diverse genetic, metabolic, and in some cases, peculiar phenotypic features to fill an array of ecological niches in marine sediments. Here, we review recent and selected findings on the microbial guilds that are involved in the transformation of different sulfur compounds in marine sediments and emphasise how these are interlinked and have a major influence on ecology and biogeochemistry in the seafloor. Extraordinary discoveries have increased our knowledge on microbial sulfur cycling, mainly in sulfate‐rich surface sediments, yet many questions remain regarding how sulfur redox processes may sustain the deep‐subsurface biosphere and the impact of organic sulfur compounds on the marine sulfur cycle.

show abstract

Section: Dissimilatory Sulfate Reductionmentioning

confidence: 97%

“…Various SRM that are ecologically relevant in these marine sediment layers belong to the class Deltaproteobacteria , whereby members of the family Desulfobacteraceae are typically one of the most important taxonomic groups in terms of abundance and activity (Fig. ) (Robador et al ., ).…”

Section: Dissimilatory Sulfate Reductionmentioning

confidence: 97%

The life sulfuric: microbial ecology of sulfur cycling in marine sediments

Wasmund

Mußmann

Loy

2017

Environ Microbiol Rep

Self Cite

308

266

View full text Add to dashboard Cite

show abstract

“…Warming also affects metabolic processes driving biogeochemical cycles in coastal benthic ecosystems. Warming enhances sediment sulfate reduction rates (Robador et al, 2016), leading to an increase in sulfide accumulation in coastal bare sediments (Sanz-Lázaro et al, 2011) and seagrass-colonized sediments (Koch et al, 2007). In the Mediterranean Sea, heat waves and warming trigger sulfide intrusion in P. oceanica shoots (García et al, 2013), which has toxic effects on plant meristems (Garcias-Bonet et al, 2008) and increases shoot mortality (Calleja et al, 2007).…”

Section: N Garcias-bonet Et Al: Nitrogen Fixation In Mediterranean mentioning

confidence: 99%

Warming effect on nitrogen fixation in Mediterranean macrophyte sediments

et al. 2019

View full text Add to dashboard Cite

Abstract. The Mediterranean Sea is warming faster than the global ocean, with important consequences for organisms and biogeochemical cycles. Warming is a major stressor for key marine benthic macrophytes. However, the effect of warming on marine N2 fixation remains unknown, despite the fact that the high productivity of macrophytes in oligotrophic waters is partially sustained by the input of new nitrogen (N) into the system by N2 fixation. Here, we assess the impact of warming on the N2 fixation rates of three key marine macrophytes: Posidonia oceanica, Cymodocea nodosa, and Caulerpa prolifera. We experimentally measured N2 fixation rates in vegetated and bare sediments at temperatures encompassing current summer mean (25 and 27 ∘C), projected summer mean (29 and 31 ∘C), and projected summer maximum (33 ∘C) seawater surface temperatures (SSTs) by the end of the century under a scenario of moderate greenhouse gas emissions. We found that N2 fixation rates in vegetated sediments were 2.8-fold higher than in bare sediments at current summer mean SST, with no differences among macrophytes. Currently, the contribution of N2 fixation to macrophyte productivity could account for up to 7 %, 13.8 %, and 1.8 % of N requirements for P. oceanica, C. nodosa, and C. prolifera, respectively. We show the temperature dependence of sediment N2 fixation rates. However, the thermal response differed for vegetated sediments, in which rates showed an optimum at 31 ∘C followed by a sharp decrease at 33 ∘C, and bare sediments, in which rates increased along the range of the experimental temperatures. The activation energy and Q10 were lower in vegetated than bare sediments, indicating the lower thermal sensitivity of vegetated sediments. The projected warming is expected to increase the contribution of N2 fixation to Mediterranean macrophyte productivity. Therefore, the thermal dependence of N2 fixation might have important consequences for primary production in coastal ecosystems in the context of warming.

show abstract

“…Phylotypes associated with the utilization of the added substrate at a given dose or with sulfate reduction had to be significantly enriched in at least two 16S rRNA gene and/or transcript libraries (n = 4 for substrate utilization, n = 8 for sulfate reduction) compared to the respective control (no substrate control or inhibited control). Significant enrichment of phylotypes was determined using a two-proportion T-test (Müller et al, 2014;Robador et al, 2016). P-values were corrected for multiple comparisons using the Benjamini-Hochberg false discovery rate method with p.adjust() from the R statistical package (R Core Team, 2015).…”

Section: S Rrna Gene and Transcript Sequence Analysesmentioning

confidence: 99%

Bacterial interactions during sequential degradation of cyanobacterial necromass in a sulfidic arctic marine sediment

Müller

Pelikan

Rezende

et al. 2018

Environmental Microbiology

Self Cite

View full text Add to dashboard Cite

SummarySeafloor microorganisms impact global carbon cycling by mineralizing vast quantities of organic matter (OM) from pelagic primary production, which is predicted to increase in the Arctic because of diminishing sea ice cover. We studied microbial interspecies‐carbon‐flow during anaerobic OM degradation in arctic marine sediment using stable isotope probing. We supplemented sediment incubations with 13C‐labeled cyanobacterial necromass (spirulina), mimicking fresh OM input, or acetate, an important OM degradation intermediate and monitored sulfate reduction rates and concentrations of volatile fatty acids (VFAs) during substrate degradation. Sequential 16S rRNA gene and transcript amplicon sequencing and fluorescence in situ hybridization combined with Raman microspectroscopy revealed that only few bacterial species were the main degraders of 13C‐spirulina necromass. Psychrilyobacter, Psychromonas, Marinifilum, Colwellia, Marinilabiaceae and Clostridiales species were likely involved in the primary hydrolysis and fermentation of spirulina. VFAs, mainly acetate, produced from spirulina degradation were mineralized by sulfate‐reducing bacteria and an Arcobacter species. Cellular activity of Desulfobacteraceae and Desulfobulbaceae species during acetoclastic sulfate reduction was largely decoupled from relative 16S rRNA gene abundance shifts. Our findings provide new insights into the identities and physiological constraints that determine the population dynamics of key microorganisms during complex OM degradation in arctic marine sediments.© 2018 Society for Applied Microbiology and John Wiley & Sons Ltd

show abstract

Activity and community structures of sulfate-reducing microorganisms in polar, temperate and tropical marine sediments

Cited by 70 publications

References 71 publications

The life sulfuric: microbial ecology of sulfur cycling in marine sediments

The life sulfuric: microbial ecology of sulfur cycling in marine sediments

Warming effect on nitrogen fixation in Mediterranean macrophyte sediments

Bacterial interactions during sequential degradation of cyanobacterial necromass in a sulfidic arctic marine sediment

Contact Info

Product

Resources

About