Bacterial Diversity and Distribution in the Holocene Sediments of a Northern Temperate Lake

Nelson, David M.; Ohene-Adjei, Samuel; Hu, Feng Sheng; Cann, Isaac; Mackie, Roderick I.

doi:10.1007/s00248-006-9195-9

Cited by 41 publications

(32 citation statements)

References 26 publications

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“…1C and 2). High respiration rates and persistent microbial activity can be therein major contributors to early diagenetic processes (Miskin et al 1998;Bird et al 2001;Nelson et al 2007;Dong et al 2010). Generally, microbial imprints lead to coupled δ 13 C org and δ 15 N negative trends (Freudenthal et al 2001;Lehmann et al 2002) as heterotrophic bacteria favor the uptake of light isotopes when growing without substrate limitation (McGoldrick et al 2008).…”

Section: Microbial Signal In Om Signaturesmentioning

confidence: 99%

Paleoenvironmental conditions define current sustainability of microbial populations in Laguna Potrok Aike sediments, Argentina

Vuillemin

Ariztegui

Lücke³

et al. 2013

Aquat Sci

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Rainfall and geology of the catchment exert a dominant control on the trophic state of endorheic basins. River inflows and runoff provide nutrients, influencing primary productivity in the water column. Through time, paleoenvironmental conditions are recorded as variations within the sedimentary organic fraction. Thereafter, microbial populations settle and develop within sediments and lead to degradation processes as long as they remain active. However, their presence is generally not considered in Quaternary studies.The present study is based on the sedimentary record of the maar lake of Laguna Potrok Aike, southern Patagonia. We investigate the relationship between paleoenvironmental conditions and colonization of the corresponding sediments by microbes. Microbiological and geochemical analyses were combined to determine factors allowing microbes to sustain their activity over time. The study of Holocene sediments, containing dense and active microbial communities, provided means to evaluate the potential of microbial communities as agents of early diagenesis. We show that phosphorus released during organic matter degradation is essential for microbial growth. In highly colonized sediments, microbial communities appear capable of recycling the excreted ammonium, thus accounting for nitrogen fractionation toward high values in bulk sediment. Microbial activity in Laguna Potrok Aike still persists in 30 ka old sediments. Thus, we proposed that future lacustrine studies should include some microbial indicators to assess their impact in diagenetic processes.

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Section: Microbial Signal In Om Signaturesmentioning

confidence: 99%

Paleoenvironmental conditions define current sustainability of microbial populations in Laguna Potrok Aike sediments, Argentina

Vuillemin

Ariztegui

Lücke³

et al. 2013

Aquat Sci

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“…plumbophilus' DSM 6690 was 93 %. Several environmental clones closely related to the novel strain have been reported from cold sediment of a meromictic lake (Nelson et al, 2007); these sequences formed a phylogenetic cluster distinct from the cluster comprising species of the genus Thiobacillus with validly published names (Fig. 1).…”

mentioning

confidence: 97%

Sulfuricella denitrificans gen. nov., sp. nov., a sulfur-oxidizing autotroph isolated from a freshwater lake

Kojima

Fukui

2010

International Journal of Systematic and Evolutionary Microbiology

105

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Sulfuricella denitrificans gen. nov., sp. nov., a sulfur-oxidizing autotroph isolated from a freshwater lake Hisaya Kojima and Manabu FukuiCorrespondence Hisaya Kojima kojimah@pop.lowtem.hokudai. ac.jpInstitute of Low Temperature Science, Hokkaido University, Kita-19, Nishi-8, Kita-ku, Sapporo 060-0819, Japan A novel facultatively anaerobic, sulfur-oxidizing bacterium, strain skB26 T , was isolated from anoxic water of a freshwater lake in Japan. The cells were rod-shaped, motile and Gram-negative. Strain skB26 T oxidized elemental sulfur and thiosulfate to sulfate as sole energy sources. Strain skB26 T was microaerobic and could also utilize nitrate as an electron acceptor, reducing it to nitrogen. Growth was observed at temperatures below 28 6C; optimum growth was observed at 22 6C. The pH range for growth was 6.0-9.0, and the optimum pH was 7.5-8.0. Optimum growth of the isolate was observed in medium without NaCl, and no growth was observed in medium containing more than 220 mM NaCl. The G+C content of genomic DNA was around 59 mol%. Phylogenetic analysis based on the 16S rRNA gene sequence indicated that the strain was a member of the class Betaproteobacteria, and the closest cultivated relative was 'Thiobacillus plumbophilus' DSM 6690, with 93 % sequence similarity. Phylogenetic analyses were also performed using sequences of genes involved in sulfur oxidation, inorganic carbon fixation and nitrate respiration. On the basis of its phylogenetic and phenotypic properties, strain skB26 T (5NBRC 105220 T 5DSM 22764 T ) is proposed as the type strain of a novel species of a new genus, Sulfuricella denitrificans gen. nov., sp. nov.Nitrogen and sulfur are essential for all organisms as major components of cell materials. There are also a variety of abundant inorganic compounds of these elements in the biosphere, with a wide range of redox states. These chemical species have specific properties, and biogeochemical cycling of the elements is largely dependent on dissimilatory and assimilatory activities of prokaryotes. Compounds of nitrogen and sulfur act as electron acceptors or donors for diverse types of respiration, and cycles of these elements are coupled directly by sulfuroxidizing bacteria, which utilize oxidized forms of nitrogen as electron acceptors. Phylogenetically diverse bacteria and archaea are capable of chemolithotrophic growth on reduced forms of sulfur, but the majority of isolated mesophilic species belong to the phylum Proteobacteria.One of the major sources of reduced sulfur compounds in natural environments is sulfate reduction occurring under oxygen-and nitrate-depleted conditions. This terminal process of mineralization takes place mainly in marine and lake sediments. These environments are often associated with low temperature, and the presence of cold-adapted sulfur oxidizers is expected in such habitats.In the present study, a novel psychrotolerant, sulfuroxidizing, nitrate-reducing bacterium, strain skB26 T , was isolated from cold anoxic water obtained from a freshwater lake. Based on ...

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“…Each of them contains very different sediment and associated microbial assemblages. Understanding trophic states within the water columns and the sediments is essential to reconstructing past climates (Nelson et al, 2007) as well as to managing anthropogenic impact on modern lakes (Ye et al, 2009). …”

Section: Future Improvements In Detecting the Living Biosphere In Lakmentioning

confidence: 99%

Establishing Sampling Procedures in Lake Cores for Subsurface Biosphere Studies: Assessing In Situ Microbial Activity

Vuillemin

Ariztegui

Vásconcelos

2010

Scientific Drilling

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Sub-recent sediments in modern lakes are ideal to study early diagenetic processes with a combination of physical, chemical, and biological approaches. Current developments in the rapidly evolving ﬁeld of geomicrobiology have allowed determining the role of microbes in these processes. Their distribution and diversity in marine sediments have been studied for some years. Comparable studies in the lacustrine realm, however, are quite scarce and mainly focused on the water column and/or very shallow sedi-ments. Thus, there is a need to determine the presence of living microbes in older lacustrine sediments. During the PASADO (Potrok Aike Maar Lake Sediment Archive Drilling Project) ICDP (International Continental Scientiﬁc Drilling Program) drilling, more than 500 meters of sedimentary cores were retrieved from this crater lake. A 100-m-long core was dedicated to a detailed geomicrobiological study. Here we report a complete in situ sampling procedure that aims to recover aseptic samples as well as determining active in situ biological activit

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Bacterial Diversity and Distribution in the Holocene Sediments of a Northern Temperate Lake

Cited by 41 publications

References 26 publications

Paleoenvironmental conditions define current sustainability of microbial populations in Laguna Potrok Aike sediments, Argentina

Paleoenvironmental conditions define current sustainability of microbial populations in Laguna Potrok Aike sediments, Argentina

Sulfuricella denitrificans gen. nov., sp. nov., a sulfur-oxidizing autotroph isolated from a freshwater lake

Establishing Sampling Procedures in Lake Cores for Subsurface Biosphere Studies: Assessing In Situ Microbial Activity

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