Response of forest soil bacterial communities to mercury chloride application

Frey, Beat; Rieder, Stephan R.

doi:10.1016/j.soilbio.2013.06.001

Cited by 44 publications

(23 citation statements)

References 57 publications

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“…However, we found the shifts in the bacterial community structure of paddy soils along the Hg gradient. Many studies have suggested that Hg stress strongly affects the soil microbial function and community [7,12]; however, to date, there are still only few studies regarding the effects of long-term Hg contamination on the bacterial community in paddy soils using next generation sequencing techniques. The results of CCA demonstrate that the bacterial community structure varied across the four sites, implying the important roles of Hg pollution in influencing bacterial community structure.…”

Section: Effects Of Hg Contamination On the Diversity Abundance And mentioning

confidence: 99%

“…Extensive research has been devoted to exploring the influence of Hg pollution on human health [2,3]. Recently, the impact of Hg on soil microbial communities also has received great concern [4][5][6][7] because soil microorganisms are responsible for many fundamental ecological processes such as C and N biogeochemical cycles [8]. It has also been suggested that Hg contamination could adversely impact soil respiration [9], enzyme activities [10,11] and the potential nitrification rate [12].…”

Section: Introductionmentioning

confidence: 99%

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Patterns of Bacterial Diversity Along a Long-Term Mercury-Contaminated Gradient in the Paddy Soils

et al. 2014

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Mercury (Hg) pollution is usually regarded as an environmental stress in reducing microbial diversity and altering bacterial community structure. However, these results were based on relatively short-term studies, which might obscure the real response of microbial species to Hg contamination. Here, we analysed the bacterial abundance and community composition in paddy soils that have been potentially contaminated by Hg for more than 600 years. Expectedly, the soil Hg pollution significantly influenced the bacterial community structure. However, the bacterial abundance was significantly correlated with the soil organic matter content rather than the total Hg (THg) concentration. The bacterial alpha diversity increased at relatively low levels of THg and methylmercury (MeHg) and subsequently approached a plateau above 4.86 mg kg −1 THg or 18.62 ng g −1 MeHg, respectively. Contrasting with the general prediction of decreasing diversity along Hg stress, our results seem to be consistent with the intermediate disturbance hypotheses with the peak biological diversity under intermediate disturbance or stress. This result was partly supported by the inconsistent response of bacterial species to Hg stress. For instance, the relative abundance of Nitrospirae decreased, while that of Gemmatimonadetes increased significantly along the increasing soil THg and MeHg concentrations. In addition, the content of SO 4 2− , THg, MeHg and soil depth were the four main factors influencing bacterial community structures based on the canonical correspondence analysis (CCA). Overall, our findings provide novel insight into the distribution patterns of bacterial community along the long-term Hg-contaminated gradient in paddy soils.

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Section: Effects Of Hg Contamination On the Diversity Abundance And mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Patterns of Bacterial Diversity Along a Long-Term Mercury-Contaminated Gradient in the Paddy Soils

et al. 2014

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“…Studies conducted at the local scale seemed to support the idea that Hg pollution can alter soil microbial communities [ 10 – 12 ]. Moreover, previous work based on short-term incubation experiments demonstrated that Hg amendments can alter the soil microbiome and its ecological functions [ 13 , 14 ]. However, much less is known on the role of Hg pollution in shaping the taxonomic and functional attributes of microbial communities in natural ecosystems across large spatial scale and different types of croplands.…”

Section: Introductionmentioning

confidence: 99%

Consistent responses of soil microbial taxonomic and functional attributes to mercury pollution across China

et al. 2018

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BackgroundThe ecological consequences of mercury (Hg) pollution—one of the major pollutants worldwide—on microbial taxonomic and functional attributes remain poorly understood and largely unexplored. Using soils from two typical Hg-impacted regions across China, here, we evaluated the role of Hg pollution in regulating bacterial abundance, diversity, and co-occurrence network. We also investigated the associations between Hg contents and the relative abundance of microbial functional genes by analyzing the soil metagenomes from a subset of those sites.ResultsWe found that soil Hg largely influenced the taxonomic and functional attributes of microbial communities in the two studied regions. In general, Hg pollution was negatively related to bacterial abundance, but positively related to the diversity of bacteria in two separate regions. We also found some consistent associations between soil Hg contents and the community composition of bacteria. For example, soil total Hg content was positively related to the relative abundance of Firmicutes and Bacteroidetes in both paddy and upland soils. In contrast, the methylmercury (MeHg) concentration was negatively correlated to the relative abundance of Nitrospirae in the two types of soils. Increases in soil Hg pollution correlated with drastic changes in the relative abundance of ecological clusters within the co-occurrence network of bacterial communities for the two regions. Using metagenomic data, we were also able to detect the effect of Hg pollution on multiple functional genes relevant to key soil processes such as element cycles and Hg transformations (e.g., methylation and reduction).ConclusionsTogether, our study provides solid evidence that Hg pollution has predictable and significant effects on multiple taxonomic and functional attributes including bacterial abundance, diversity, and the relative abundance of ecological clusters and functional genes. Our results suggest an increase in soil Hg pollution linked to human activities will lead to predictable shifts in the taxonomic and functional attributes in the Hg-impacted areas, with potential implications for sustainable management of agricultural ecosystems and elsewhere.Electronic supplementary materialThe online version of this article (10.1186/s40168-018-0572-7) contains supplementary material, which is available to authorized users.

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“…To explain the lack of consistency concerning the impact of Hg on the genetic structure of the soil fungal community, Frey and Rieder (2013) suggested that Hg stress may be dependent on the soil properties and proposed a critical limit (environmental impacts) concentration for soluble Hg of 4 µg Hg/kg dry soil.…”

Section: Impact Of Hg On Soil Fungimentioning

confidence: 99%

Interactions between Hg and soil microbes: microbial diversity and mechanisms, with an emphasis on fungal processes

Durand

Maillard

Foulon

et al. 2020

Appl Microbiol Biotechnol

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Mercury (Hg) is a highly toxic metal with no known biological function, and it can be highly bioavailable in terrestrial ecosystems. Although fungi are important contributors to a number of soil processes including plant nutrient uptake and decomposition, little is known about the effect of Hg on fungi. Fungi accumulate the largest amount of Hg and are the organisms capable of the highest bioaccumulation of Hg. While referring to detailed mechanisms in bacteria, this mini-review emphasizes the progress made recently on this topic and represent the first step towards a better understanding of the mechanisms underlying Hg tolerance and accumulation in fungal species and hence on the role of fungi within the Hg cycle at Hg contaminated sites.

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Response of forest soil bacterial communities to mercury chloride application

Cited by 44 publications

References 57 publications

Patterns of Bacterial Diversity Along a Long-Term Mercury-Contaminated Gradient in the Paddy Soils

Patterns of Bacterial Diversity Along a Long-Term Mercury-Contaminated Gradient in the Paddy Soils

Consistent responses of soil microbial taxonomic and functional attributes to mercury pollution across China

Interactions between Hg and soil microbes: microbial diversity and mechanisms, with an emphasis on fungal processes

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