Resilience of microbial communities in Mediterranean soil after induced drought and manipulated <scp>UV</scp> radiation

Bañeras, Lluís; Llorens, Laura; Díaz-Guerra, L.; Gispert, María; Amo, Elena Hernández-del; Massart, Sébastien; Verdaguer, Dolors

doi:10.1111/ejss.13218

Cited by 10 publications

(6 citation statements)

References 69 publications

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“…For instance, the effect of soil moisture produced a gradient of richness and diversity (from higher to lower) from humid, subhumid to semiarid soils [ 27 ]. However, studies have established these differences as dual parameters, considering for example that variations in ultraviolet (UV) radiation do not alter diversity and richness indices in bacterial communities at the genus level, but a decrease in water resources associated with precipitation generates inversely proportional changes in their diversity and richness (low abundance and higher diversity) [ 28 ]. Moreover, other authors relate this effect to thermal and hydric factors, which, combined, trigger a rapid decrease in bacterial diversity in soils, either in the short term [ 29 ] or in the long term [ 30 ], associating their results to a rapid response to adverse climatic conditions.…”

Section: Discussionmentioning

confidence: 99%

Topsoil and subsoil bacterial community assemblies across different drainage conditions in a mountain environment

et al. 2023

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Background High mountainous environments are of particular interest as they play an essential role for life and human societies, while being environments which are highly vulnerable to climate change and land use intensification. Despite this, our knowledge of high mountain soils in South America and their microbial community structure is strikingly scarce, which is of more concern considering the large population that depends on the ecosystem services provided by these areas. Conversely, the Central Andes, located in the Mediterranean region of Chile, has long been studied for its singular flora, whose diversity and endemism has been attributed to the particular geological history and pronounced environmental gradients in short distances. Here, we explore soil properties and microbial community structure depending on drainage class in a well-preserved Andean valley on the lower alpine vegetation belt (~2500 m a.s.l.) at 33.5˚S. This presents an opportunity to determine changes in the overall bacterial community structure across different types of soils and their distinct layers in a soil depth profile of a highly heterogeneous environment. Methods Five sites closely located (<1.5 km) and distributed in a well preserved Andean valley on the lower alpine vegetation belt (~2500 m a.s.l.) at 33.5˚S were selected based on a pedological approach taking into account soil types, drainage classes and horizons. We analyzed 113 soil samples using high-throughput sequencing of the 16S rRNA gene to describe bacterial abundance, taxonomic composition, and co-occurrence networks. Results Almost 18,427 Amplicon Sequence Variant (ASVs) affiliated to 55 phyla were detected. The bacterial community structure within the same horizons were very similar validating the pedological sampling approach. Bray-Curtis dissimilarity analysis revealed that the structure of bacterial communities in superficial horizons (topsoil) differed from those found in deep horizons (subsoil) in a site-specific manner. However, an overall closer relationship was observed between topsoil as opposed to between subsoil microbial communities. Alpha diversity of soil bacterial communities was higher in topsoil, which also showed more bacterial members interacting and with higher average connectivity compared to subsoils. Finally, abundances of specific taxa could be considered as biological markers in the transition from topsoil to subsoil horizons, like Fibrobacterota, Proteobacteria, Bacteroidota for shallower soils and Chloroflexi, Latescibacterota and Nitrospirota for deeper soils. Conclusions The results indicate the importance of the soil drainage conditions for the bacterial community composition, suggesting that information of both structure and their possible ecological relationships, might be useful in clarifying the location of the edge of the topsoil-subsoil transition in mountainous environments.

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Section: Discussionmentioning

confidence: 99%

Topsoil and subsoil bacterial community assemblies across different drainage conditions in a mountain environment

et al. 2023

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“…However, the increase in depth caused an important change in the composition of the microbiome, leaving only one OTUs as dominant, FN436189 (Figure 3B), taxonomically related to the order Solirubrobacterales. The Actinobacteria assigned to this order are mostly related to soils and, although many aspects of their ecological significance are unknown, they are associated with environments exhibiting extreme conditions [103]. The existing difficulties to grow them in laboratory conditions greatly limit the available knowledge, despite which [104] postulate their cosmopolitan character, including aquatic environments based on their mobility and oligotrophic nature.…”

Section: Discussionmentioning

confidence: 99%

Comparative Study of Microbial Diversity in Different Coastal Aquifers: Determining Factors

Vargas-Garcı́a

Sola

Vallejos

2023

Water

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Coastal aquifers have been extensively studied from the hydrodynamic and geochemical points of view, but there is still a significant gap in the knowledge of their microbial diversity. The bacterial communities of four coastal aquifers at different depths and salinities were studied in order to infer the anthropogenic and physico-chemical influences on groundwater microbiota. At the physico-chemical level, samples from different aquifers, but with similar salinities, are more similar than those taken within the same aquifer. The microbial community at the phylum level shows the dominance of Proteobacteria, Firmicutes, and Actinobacteria. Samples from the same aquifer, although having very different salinities, are more similar than samples with similar physico-chemical characteristics. Therefore, the taxa present in these media are resilient to environmental variations. The aquifer preserving the most pristine conditions harbors the lowest values of biodiversity, compared to those affected by anthropic activities. The incorporation of pollutants into the aquifer favors the development of a so-called “rare biosphere”, consisting of a high number of taxa which represent a low percentage (<1%) of the total microbial community. The analysis of microbial biodiversity in a coastal aquifer could be used as an indicator of the degree of anthropic alteration.

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“…This may explain the higher abundance of saprotroph taxa or taxa able to degrade cellulose and lignin. Bacterial taxa such as Verrucomicrobiae and Ktedonobacteria at the class level, Chthoniobacterales and Ktedonobacterales at the order level, and Ktedonobacteriaceae at the family level, possess the capability to degrade lignin, cellulose, and other complex forms of carbon The abundance of the Ktedonobacteria class and its descendant taxa is higher under elevated levels of UV radiation (Maccario et al 2019;Bañeras et al 2022). This phenomenon could account for their higher abundance in sites under hydroelectric lines, where the absence of tree cover results in greater exposure to UV radiation.…”

Section: Effect Of Disturbances On Soil Microbiomementioning

confidence: 99%

Unraveling the interplay of the soil microbiome and (poly)phenol content in blueberry in response to disturbances

Thomas,

Lamara,

Desjardins

et al. 2024

Preprint

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Aims Disturbances exert direct and indirect effects on plants through alterations of soil properties and microbiota composition. This can induce stress, resulting in modifications of plants’ phytochemical profile. This in turn can affect the possibility for Indigenous people to engage in cultural activities depending on wild plants used as food or medicine. As a case study, we evaluated correlations between (poly)phenols in Vaccinium angustifolium fruits, disturbances from mining and hydroelectric activities, soil properties, and soil microbiome composition. Methods We collected fruit and soil samples in the territories of three Indigenous communities in eastern Canada. Fruits were analyzed for their concentrations in anthocyanins, proanthocyanidins and other (poly)phenols. Soil microbial DNA was extracted to reconstruct bacterial and fungal communities. A secondary subset of soil samples was used to measure soil properties. Relationships between soil, disturbances and (poly)phenols were investigated using multivariate analyses. Results Disturbances affected soil properties and microbiome, but not fruit (poly)phenol content. Two soil bacterial classes unaffected by disturbances, Bacilli and Desulfitobacteriia, were positively correlated with levels of proanthocyanidines and delphinidin-, cyanidin-, and petunidin-3-glucoside in fruits. Conclusion Disturbances did not affect (poly)phenol content in V. angustifolium fruits. However, mine disturbances may contaminate fruits with pollutants detrimental to human health, which should be evaluated before drawing conclusions about the effect of disturbances on plant nutritional and medicinal properties. Some soil bacterial classes seem to enhance the (poly)phenolic content of V. angustifolium fruits, suggesting that a strategy could be developed for enhancing the nutritional and medicinal properties of this culturally salient species.

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Resilience of microbial communities in Mediterranean soil after induced drought and manipulated UV radiation

Cited by 10 publications

References 69 publications

Topsoil and subsoil bacterial community assemblies across different drainage conditions in a mountain environment

Topsoil and subsoil bacterial community assemblies across different drainage conditions in a mountain environment

Comparative Study of Microbial Diversity in Different Coastal Aquifers: Determining Factors

Unraveling the interplay of the soil microbiome and (poly)phenol content in blueberry in response to disturbances

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