Spatial microbial community structure and biodiversity analysis in “extreme” hypersaline soils of a semiarid Mediterranean area

Canfora, Loredana; Papa, Giuseppe Lo; Antisari, Livia Vittori; Bazan, Giuseppe; Dazzi, Carmelo; Benedetti, Antonio

doi:10.1016/j.apsoil.2015.04.014

Cited by 35 publications

(19 citation statements)

References 32 publications

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“…These characters made the unique prokaryotic community in soils of Qarhan Salt Lake. Several reports showed that Bacteria were numerically dominant relative to Archaea in saline soils of the areas they explored 10 , 28 , 29 , and there were also reports showing that Archaea were dominant 30 , 31 . In the present study, we found that Archaea were dominant in saline soil samples with EC about 58 dS/m to 93 dS/m; Bacteria were dominant in soil samples with lower or higher salinity except three outliers (SD6, SD3, SS3) in Qarhan Salt Lake (Fig.…”

Section: Discussionmentioning

confidence: 99%

Prokaryotic Community Distribution along an Ecological Gradient of Salinity in Surface and Subsurface Saline Soils

Xie

Deng

Zhang

et al. 2017

Sci Rep

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Salinity effects on microbial communities in saline soils is still unclear, and little is known about subsurface soil microbial communities especially in saline or hypersaline ecosystems. Here we presented the survey of the prokaryotic community in saline soils along a salinity gradient (17.3–148.3 dS/m) in surface (0–10 cm) and subsurface (15–30 cm) saline soils of Qarhan Salt Lake, China. Moreover, we compared them with three paired nonsaline normal soils. Using the high-throughput sequencing technology and several statistical methods, we observed no significant community difference between surface soils and subsurface soils. For environmental factors, we found that TOC was the primary driver of the prokaryotic community distribution in surface saline soils, so was pH in subsurface saline soils. Salinity had more effects on the prokaryotic community in subsurface saline soils than in surface saline soils and played a less important role in saline soils than in saline waters or saline sediments. Our research provided references for the prokaryotic community distribution along a salinity gradient in both surface and subsurface saline soils of arid playa areas.

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Section: Discussionmentioning

confidence: 99%

Prokaryotic Community Distribution along an Ecological Gradient of Salinity in Surface and Subsurface Saline Soils

Xie

Deng

Zhang

et al. 2017

Sci Rep

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“…Second, EC was not the driving force and the archaeal community was controlled by pH or organic matter, that did not change with flooding. Tripathi et al (2015) found that pH correlated with the composition of the archaeal community in temperate and tropical soils, but also the biome, while Canfora et al (2015) reported that organic matter in soil favored their diversity. Navarro-Noya et al (2015) reported that differences in pH better explained the composition of the archaeal community in haloalkaline Texcoco soils.…”

Section: Discussionmentioning

confidence: 99%

Reducing Salinity by Flooding an Extremely Alkaline and Saline Soil Changes the Bacterial Community but Its Effect on the Archaeal Community Is Limited

et al. 2017

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Regular flooding of the soil to reduce salinity will change soil characteristics, but also the microbial community structure. Soil of the former lake Texcoco with electrolytic conductivity (EC) 157.4 dS m-1 and pH 10.3 was flooded monthly in the laboratory under controlled conditions for 10 months while soil characteristics were determined and the archaeal and bacterial community structure monitored by means of 454 pyrosequencing of the 16S rRNA gene. The EC of the soil dropped from 157.8 to 1.7 dS m-1 and the clay content decreased from 430 to 270 g kg-1 after ten floodings, but the pH (10.3) did not change significantly over time. Flooding the soil had a limited effect on the archaeal community structure and only the relative abundance of Haloferax-like 16S rRNA phylotypes changed significantly. Differences in archaeal population structure were more defined by the initial physicochemical properties of the soil sample than by a reduction in salinity. Flooding, however, had a stronger effect on bacterial community structure than on the archaeal community structure. A wide range of bacterial taxa was affected significantly by changes in the soil characteristics, i.e., four phyla, nine classes, 17 orders, and 28 families. The most marked change occurred after only one flooding characterized by a sharp decrease in the relative abundance of bacterial groups belonging to the Gammaproteobacteria, e.g., Halomonadaceae (Oceanospirillales), Pseudomonadaceae, and Xanthomonadaceae and an increase in that of the [Rhodothermales] (Bacteroidetes), Nitriliruptorales (Actinobacteria), and unassigned Bacteria. It was found that flooding the soil sharply reduced the EC, but also the soil clay content. Flooding the soil had a limited effect on the archaeal community structure, but altered the bacterial community structure significantly.

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“…In this work, analyses were concentrated at La Fossa Crater (38 • Interstitial soil gases were collected from 8 sampling sites, as follows: (i) 3 sites on the northern flank of La Fossa Crater at different distances from fumarolic emissions (CSCS, CSF56, CSF94), (ii) 1 site on the western flank of the volcanic edifice characterized by the presence of a pioneer plant (CPBS), and (iii) 4 sites in the Levante Bay (LSV11, LSV13, LSV14, LPBS), selected according to in situ soil CO 2 flux measurements. Soil CO 2 fluxes were measured according to the accumulation chamber (AC) method [39], using a cylindrical chamber (basal area 200 cm 2 and inner volume 3060 cm 3 ) and a Licor ® (NE, USA) Li-820 Infra-Red (IR) spectrophotometer, as described in Venturi et al [40].…”

Section: Interstitial Soil Gas Sampling and Analysesmentioning

confidence: 99%

“…Understanding the mechanisms underlying the adaptation of microbes to extreme environments is of fundamental importance to deeply investigate processes that led to the evolution of Earth [2]; for example, it has been shown that microbial communities are mainly shaped by environmental conditions and the microbes inhabiting extreme habitats evolve faster than those populating benign environments [1]. Bacterial communities from natural extreme environments represent not only a gene reservoir for potential biotechnological applications (e.g., the discovery of the Taq polymerase, isolated from the thermophilic bacteria Thermus aquaticus), but they can be used as a model system to explore relationships between diversity and environmental factors [3]. Adaptative features of these extremophiles permit them to survive under such extreme and hostile environmental conditions [4].…”

Section: Introductionmentioning

confidence: 99%

Bacterial Communities from Extreme Environments: Vulcano Island

et al. 2019

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Although volcanoes represent extreme environments for life, they harbour bacterial communities. Vulcano Island (Aeolian Islands, Sicily) presents an intense fumarolic activity and widespread soil degassing, fed by variable amounts of magmatic gases (dominant at La Fossa Crater) and hydrothermal fluids (dominant at Levante Bay). The aim of this study is to analyse the microbial communities from the different environments of Vulcano Island and to evaluate their possible correlation with the composition of the gas emissions. Microbial analyses were carried out on soils and pioneer plants from both La Fossa Crater and Levante Bay. Total DNA has been extracted from all the samples and sequenced through Illumina MiSeq platform. The analysis of microbiome composition and the gases sampled in the same sites could suggest a possible correlation between the two parameters. We can suggest that the ability of different bacterial genera/species to survive in the same area might be due to the selection of particular genetic traits allowing the survival of these microorganisms. On the other side, the finding that microbial communities inhabiting different sites exhibiting different emission profiles are similar might be explained on the basis of a possible sharing of metabolic abilities related to the gas composition.

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Spatial microbial community structure and biodiversity analysis in “extreme” hypersaline soils of a semiarid Mediterranean area

Cited by 35 publications

References 32 publications

Prokaryotic Community Distribution along an Ecological Gradient of Salinity in Surface and Subsurface Saline Soils

Prokaryotic Community Distribution along an Ecological Gradient of Salinity in Surface and Subsurface Saline Soils

Reducing Salinity by Flooding an Extremely Alkaline and Saline Soil Changes the Bacterial Community but Its Effect on the Archaeal Community Is Limited

Bacterial Communities from Extreme Environments: Vulcano Island

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