Spatial and temporal distribution of Caulobacter spp. in two mesotrophic lakes

Staley, James T.

doi:10.1016/0378-1097(87)90035-8

Cited by 12 publications

(13 citation statements)

References 10 publications

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“…The Oceanicaulis genus belongs to the Caulobacteriales order that includes known SQDG lipid producers (http://onlinelibrary.wiley.com/doi/10.1111/1462-2920.12202/suppinfo). Caulobacteria are ubiquitous, thrive in oligotrophic conditions, and presumed to be important in the mineralization of dissolved organic material in aquatic environments (Staley et al ., ). In fact, the lifestyle of Caulobacteria , based on a mode of reproduction with a motile cell to disperse and avoid competition for resources, is consistent with a high tolerance to nutrient starvation (Poindexter, ) and might explain why this microbial group displays the ability to produce SQDG in their membranes.…”

Section: Resultsmentioning

confidence: 97%

Diversity and distribution of a key sulpholipid biosynthetic gene in marine microbial assemblages

Villanueva

Bale

Hopmans

et al. 2013

Environmental Microbiology

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Summary Sulphoquinovosyldiacylglycerols (SQDG) are polar sulphur‐containing membrane lipids, whose presence has been related to a microbial strategy to adapt to phosphate deprivation. In this study, we have targeted the sqdB gene coding the uridine 5′‐diphosphate‐sulphoquinovose (UDP‐SQ) synthase involved in the SQDG biosynthetic pathway to assess potential microbial sources of SQDGs in the marine environment. The phylogeny of the sqdB‐coding protein reveals two distinct clusters: one including green algae, higher plants and cyanobacteria, and another one comprising mainly non‐photosynthetic bacteria, as well as other cyanobacteria and algal groups. Evolutionary analysis suggests that the appearance of UDP‐SQ synthase occurred twice in cyanobacterial evolution, and one of those branches led to the diversification of the protein in members of the phylum Proteobacteria. A search of homologues of sqdB‐proteins in marine metagenomes strongly suggested the presence of heterotrophic bacteria potential SQDG producers. Application of newly developed sqdB gene primers in the marine environment revealed a high diversity of sequences affiliated to cyanobacteria and Proteobacteria in microbial mats, while in North Sea surface water, most of the detected sqdB genes were attributed to the cyanobacterium Synechococcus sp. Lipid analysis revealed that specific SQDGs were characteristic of microbial mat depth, suggesting that SQDG lipids are associated with specific producers.

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Section: Resultsmentioning

confidence: 97%

Diversity and distribution of a key sulpholipid biosynthetic gene in marine microbial assemblages

Villanueva

Bale

Hopmans

et al. 2013

Environmental Microbiology

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“…Other taxa at appreciably higher abundance in indoor air, relative to outdoor air, include Mycoplana, Thermoanaerobacter, Comamonas, Acidaminococcus, Paraprevotella, Methylobacter, Chloroflexi, and Sphingophyxis, several of which are commonly associated with human skin. Only Caulobacter, which is commonly found in freshwater lakes, streams, and soil, [71][72][73][74] was significantly more abundant in outdoor air, relative to indoor air. The detection of human-associated taxa indoors is not surprising and is consistent with previous studies that have shown human occupants to be a major source of indoor air bacterial taxa.…”

Section: Composition Of Indoor Air Microbial Communities As Comparementioning

confidence: 93%

High temporal variability in airborne bacterial diversity and abundance inside single‐family residences

et al. 2016

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Our homes are microbial habitats, and although the amounts and types of bacteria in indoor air have been shown to vary substantially across residences, temporal variability within homes has rarely been characterized. Here, we sought to quantify the temporal variability in the amounts and types of airborne bacteria in homes, and what factors drive this variability. We collected filter samples of indoor and outdoor air in 15 homes over 1 year (approximately eight time points per home, two per season), and we used culture-independent DNA sequencing approaches to characterize bacterial community composition. Significant differences in indoor air community composition were observed both between homes and within each home over time. Indoor and outdoor air community compositions were not significantly correlated, suggesting that indoor and outdoor air communities are decoupled. Indoor air communities from the same home were often just as different at adjacent time points as they were across larger temporal distances, and temporal variation correlated with changes in environmental conditions, including temperature and relative humidity. Although all homes had highly variable indoor air communities, homes with the most temporally variable communities had more stable, lower average microbial loads than homes with less variable communities.

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“…Furthermore, a relative of Caulobacter (with 97% sequence similarity to insect intestine clone D AJ459874) and one clone of the order Sphingomonadales were obtained. Both, Caulobacterales and Sphingomonadales, are aerobic chemoorganotrophs common in oligotrophic aquatic habitats (e.g., Staley et al 1987;Stahl et al 1992;Cavicchioli et al 1999).…”

Section: Orange Layermentioning

confidence: 99%

Photosynthesis versus Exopolymer Degradation in the Formation of Microbialites on the Atoll of Kiritimati, Republic of Kiribati, Central Pacific

Arp¹,

Helms²,

Karlinska³

et al. 2012

Geomicrobiology Journal

188

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International audienceAragonitic microbialites, characterized by a reticulate fabric,were discovered beneath lacustrine microbial mats on the atoll ofKiritimati, Republic of Kiribati, Central Pacific. The microbialmats, with cyanobacteria as major primary producers, grow inevaporated seawater modified by calcium carbonate and gypsumprecipitation and calcium influx via surface and/or groundwaters.Despite the high aragonite supersaturation and a high photosyntheticactivity, onlyminor aragonite precipitates are observed in thetop parts of the microbial mats. Instead, major aragonite precipitationtakes place in lower mat parts at the transition to the anoxiczone. The prokaryotic community shows a high number of phylotypesclosely related to halotolerant taxa and/or taxa with preferenceto oligotrophic habitats. Soil- and plant- inhabiting bacteriaunderline a potential surface or subsurface influx from terrestrialareas, while chitinase-producing representatives coincide with theoccurrence of insect remains in the mats. Strikingly, many of theclones have their closest relatives inmicroorganisms either involvedin methane production or consumption ofmethane or methyl compounds.Methanogens, represented by the methylotrophic genusMethanohalophilus, appear to be one of the dominant organisms inanaerobic mat parts. All this points to a significant role of methaneand methyl components in the carbon cycle of the mats. Nonetheless,thin sections and physicochemical gradients through themats,as well as the 12C-depleted carbon isotope signatures of carbonatesindicate that spherulitic components of the microbialites initiatein the photosynthesis-dominated orange mat top layer, and furthergrow in the green and purple layer below. Therefore, thesespherulites are considered as product of an extraordinary highphotosynthesis effect simultaneous to a high inhibition by pristineexopolymers. Then, successive heterotrophic bacterial activityleads to a condensation of the exopolymer framework, and finallyto the formation of crevice-like zones of partly degraded exopolymers.Here initiation of horizontal aragonite layers and verticalaragonite sheets of the microbialite occurs, which are consideredas a product of high photosynthesis at decreasing degree of inhibition.Finally, at low supersaturation and almost lack of inhibition,syntaxial growth of aragonite crystals at lamellae surfaces leadsto thin fibrous aragonite veneers. While sulfate reduction, methylotrophy,methanogenesis and ammonification play an importantrole in element cycling of the mat, there is currently no evidencefor a crucial role of them in CaCO3 precipitation. Instead, photosynthesisand exopolymer degradation sufficiently explain theobserved pattern and fabric of microbialite formation

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Spatial and temporal distribution of Caulobacter spp. in two mesotrophic lakes

Cited by 12 publications

References 10 publications

Diversity and distribution of a key sulpholipid biosynthetic gene in marine microbial assemblages

Diversity and distribution of a key sulpholipid biosynthetic gene in marine microbial assemblages

High temporal variability in airborne bacterial diversity and abundance inside single‐family residences

Photosynthesis versus Exopolymer Degradation in the Formation of Microbialites on the Atoll of Kiritimati, Republic of Kiribati, Central Pacific

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