<i>Hyphomonas</i>

Weiner, Ronald M.

doi:10.1002/9781118960608.gbm00855

Cited by 2 publications

(2 citation statements)

References 39 publications

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“…By way of exception, Blastopirellula is the dominant aerobic chemoorganotrophs indicative of sediments older than 5.2 ka BP after which it was succeeded by mainly Hyphomonas, Saccharophagus, Idiomarina, Cellvibrio and Endoriftia (Figure c). Blastopirellula grows optimally at neutral pH (Lee et al., ) while Hyphomonas is alkaliphilic (Weiner, ). The shift toward a predominance of akaliphilic Hyphomonas agrees with the timing of the Black Sea becoming more alkaline (Bahr et al., ).…”

Section: Discussionmentioning

confidence: 99%

Holocene paleodepositional changes reflected in the sedimentary microbiome of the Black Sea

Giosan

Grice

et al. 2019

Geobiology

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Subsurface microbial communities are generally thought to be structured through in situ environmental conditions such as the availability of electron acceptors and donors and porosity, but recent studies suggest that the vertical distribution of a subset of subseafloor microbial taxa, which were present at the time of deposition, were selected by the paleodepositional environment. However, additional highly resolved temporal records of subsurface microbiomes and paired paleoenvironmental reconstructions are needed to justify this claim. Here, we performed a highly resolved shotgun metagenomics survey to study the taxonomic and functional diversity of the subsurface microbiome in Holocene sediments underlying the permanently stratified and anoxic Black Sea. Obligate aerobic bacteria made the largest contribution to the observed shifts in microbial communities associated with known Holocene climate stages and transitions. This suggests that the aerobic fraction of the subseafloor microbiome was seeded from the water column and did not undergo post‐depositional selection. In contrast, obligate and facultative anaerobic bacteria showed the most significant response to the establishment of modern‐day environmental conditions 5.2 ka ago that led to a major shift in planktonic communities and in the type of sequestered organic matter available for microbial degradation. No significant shift in the subseafloor microbiome was observed as a result of environmental changes that occurred shortly after the marine reconnection, 9 ka ago. This supports the general view that the marine reconnection was a gradual process. We conclude that a high‐resolution analysis of downcore changes in the subseafloor microbiome can provide detailed insights into paleoenvironmental conditions and biogeochemical processes that occurred at the time of deposition.

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Section: Discussionmentioning

confidence: 99%

Holocene paleodepositional changes reflected in the sedimentary microbiome of the Black Sea

Giosan

Grice

et al. 2019

Geobiology

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“…The La Brava–La Punta lake system can be classified as a predominantly oxy-type environment, as DO levels were above 2.00 mg/L for most of the sampling points analyzed. This condition favors the prevalence of aerobic-type bacterial microorganisms, such as Rubritalea , Kiloniella , Pseudonomas , Hypnomonas , and Thiomicrospira [ 66 , 67 , 74 , 75 , 76 ]. In hypoxic sites, however, there was a predominance of the genera Thiomicrospira and Arcobacter ( Table 2 , Figure 5 ).…”

Section: Discussionmentioning

confidence: 99%

Physicochemical Parameters Affecting the Distribution and Diversity of the Water Column Microbial Community in the High-Altitude Andean Lake System of La Brava and La Punta

et al. 2020

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Due to the low incidence of precipitation attributed to climate change, many high-altitude Andean lakes (HAALs) and lagoons distributed along the central Andes in South America may soon disappear. This includes La Brava–La Punta, a brackish lake system located south of the Salar de Atacama within a hyper-arid and halophytic biome in the Atacama Desert. Variations in the physicochemical parameters of the water column can induce changes in microbial community composition, which we aimed to determine. Sixteen sampling points across La Brava–La Punta were studied to assess the influence of water physicochemical properties on the aquatic microbial community, determined via 16S rRNA gene analysis. Parameters such as pH and the concentrations of silica, magnesium, calcium, salinity, and dissolved oxygen showed a more homogenous pattern in La Punta samples, whereas those from La Brava had greater variability; pH and total silica were significantly different between La Brava and La Punta. The predominant phyla were Proteobacteria, Bacteroidetes, Actinobacteria, and Verrucomicrobia. The genera Psychroflexus (36.85%), Thiomicrospira (12.48%), and Pseudomonas (7.81%) were more abundant in La Brava, while Pseudospirillum (20.73%) and Roseovarius (17.20%) were more abundant in La Punta. Among the parameters, pH was the only statistically significant factor influencing the diversity within La Brava lake. These results complement the known microbial diversity and composition in the HAALs of the Atacama Desert.

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Hyphomonas

Cited by 2 publications

References 39 publications

Holocene paleodepositional changes reflected in the sedimentary microbiome of the Black Sea

Holocene paleodepositional changes reflected in the sedimentary microbiome of the Black Sea

Physicochemical Parameters Affecting the Distribution and Diversity of the Water Column Microbial Community in the High-Altitude Andean Lake System of La Brava and La Punta

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