Microbial Diversity in Sediments of Saline Qinghai Lake, China: Linking Geochemical Controls to Microbial Ecology

  title={Microbial Diversity in Sediments of Saline Qinghai Lake, China: Linking Geochemical Controls to Microbial Ecology},
  author={Hailiang Dong and Gengxin Zhang and Hongchen Jiang and Bingsong Yu and Leah R. Chapman and C. R. Lucas and Matthew W. Fields},
  journal={Microbial Ecology},
Saline lakes at high altitudes represent an important and extreme microbial ecosystem, yet little is known about microbial diversity in such environments. The objective of this study was to examine the change of microbial diversity from the bottom of the lake to sediments of 40 cm in depth in a core from Qinghai Lake. The lake is saline (12.5 g/L salinity) and alkaline (pH 9.4) and is located on the Qinghai–Tibetan Plateau at an altitude of 3196 m above sea level. Pore water chemistry of the… 

Microbial Diversity in Water and Sediment of Lake Chaka, an Athalassohaline Lake in Northwestern China

The observed changes in the microbial community structure across the water-sediment interface were correlated with a decrease in salinity from the lake water to the sediments and with the redox state changing from oxic to anoxic and may also have contributed to the observed shift in the bacterial community.

Microbial response to salinity change in Lake Chaka, a hypersaline lake on Tibetan plateau.

The effects of salinity and mineralogy on microbial community composition was studied by using a 900-cm sediment core collected from a stable, inland hypersaline lake, Lake Chaka, on the Tibetan Plateau, north-western China, using an integrated approach combining mineralogy and geochemistry, molecular microbiology, cultivation and lipid biomarker analyses.

Abundance and Diversity of Sulfur-Oxidizing Bacteria along a Salinity Gradient in Four Qinghai-Tibetan Lakes, China

Overall, salinity played a key role in controlling the diversity and distribution of SOB populations in the investigated Qinghai-Tibetan lakes.

Shifts in microbial community structure along an ecological gradient of hypersaline soils and sediments

The results of this study provide new information regarding a previously uncharacterized, hypersaline ecosystem and show the value of high-throughput sequencing in the study of complex ecosystems.

Salinity Impact on Bacterial Community Composition in Five High-Altitude Lakes from the Tibetan Plateau, Western China

The influence of salinity and geographical distance on bacterial community composition (BCC) in five freshwater, oligosaline or polysaline lakes located at altitudes higher than 4400 m on the central

Impacts of environmental change and human activity on microbial ecosystems on the Tibetan Plateau, NW China

Microorganisms play important roles in maintaining ecosystem functions. It is poorly known, however, how microbial ecosystems respond to environmental changes and human activities. The purpose of

The role of clay minerals in the preservation of organic matter in sediments of Qinghai Lake, NW China

The role of saline lake sediments in preserving organic matter has long been recognized. In order to further understand the preservation mechanisms, the role of clay minerals was studied. Three

[Bacterial diversity in Lianyungang marine sediment and Qinghai Lake sediment].

The 16S rRNA clone libraries of two different saline environments the Lianyungang marine sediment and the Qinghai Lake sediment were constructed and it was concluded that the bacterial communities in the two samples were diverse.



Microbial diversity of soda lakes

Although present-day soda lakes are geologically quite recent, they have probably existed since archaean times, permitting the evolution of independent communities of alkaliphiles since an early period in the Earth's history.

Prokaryotic communities of the north-eastern Mongolian soda lakes

The prokaryotic communities of the Mongolian alkaline salt lakes represent an interesting new example of a diverse community of haloalkaliphilic bacteria well adopted to a broad salinity range.

Depth Distribution of Microbial Diversity in Mono Lake, a Meromictic Soda Lake in California

Elevated diversity in anoxic bottom water samples relative to oxic surface water samples suggests a greater opportunity for niche differentiation in bottom versus surface waters of this lake.

Prokaryotic Metabolic Activity and Community Structure in Antarctic Continental Shelf Sediments

The prokaryote community activity and structural characteristics within marine sediment sampled across a continental shelf area located off eastern Antarctica were studied and it was revealed that at greater sediment depths, successional shifts in community structure were evident.

Microbial Communities from Methane Hydrate-Bearing Deep Marine Sediments in a Forearc Basin

The results of these analyses suggest that the microbial community in this environment is distinct from those in previously characterized methane hydrate-bearing sediments.

Vertical and temporal shifts in microbial communities in the water column and sediment of saline meromictic Lake Kaiike (Japan), as determined by a 16S rDNA-based analysis, and related to physicochemical gradients.

The measurements of bicarbonate assimilation rates showed significant phototrophicAssimilation in the chemocline and lithoautotrophic assimilation throughout the anoxic water, but were not clearly linked with net sulphide turnover rates, indicating that sulphur and carbon metabolisms were not directly correlated.

Biogeochemical and Molecular Signatures of Anaerobic Methane Oxidation in a Marine Sediment

Molecular signatures of organisms present in the transition zone were detected by using selective PCR primers for sulfate-reducing bacteria and for Archaea and revealed that they all belonged to a novel deeply branching lineage of diverse DSR gene sequences not related to any previously described DSR genes.

Activity, Distribution, and Diversity of Sulfate Reducers and Other Bacteria in Sediments above Gas Hydrate (Cascadia Margin, Oregon)

Cold seep environments such as sediments above outcropping hydrate at Hydrate Ridge (Cascadia margin off Oregon) are characterized by methane venting, high sulfide fluxes caused by the anaerobic

A carbon- and oxygen-isotope record of recent environmental change from Qinghai Lake, NE Tibetan Plateau

A c. 300-year oxygen and carbon isotope record derived from fine-grained and ostracod carbonate from Qinghai Lake testifies to dramatic interannual to interdecadal limnological change. Fine-grained