Variation of High and Low Nucleic Acid-Content Bacteria in Tibetan Ice Cores and Their Relationship to Black Carbon

Mao, Guannan; Ji, Mukan; Xu, Bin; Liu, Yongqin; Jiao, Nianzhi

doi:10.3389/fmicb.2022.844432

Cited by 5 publications

(2 citation statements)

References 57 publications

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“…The meltwater of snow, ice, and ice core samples were fixed with glutaraldehyde (final concentration: 1 %) and then stored at 4 • C, and were analyzed within 8 h after being stained with SYBR Green I (final concentration: 1 × 10 −4 ; Marie et al, 1997). SYBR Green I is the standard dye used to distinguish microorganisms from abiotic particles in various environments (Van Nevel et al, 2017;Mao et al, 2022). Stained samples were filtered using a cell strainer (pore size 420 µm) before being analyzed using flow cytometry to prevent clotting of the machine.…”

Section: Laboratory Measurementsmentioning

confidence: 99%

A comprehensive dataset of microbial abundance, dissolved organic carbon, and nitrogen in Tibetan Plateau glaciers

Liu

Fang

Guo

et al. 2022

Earth Syst. Sci. Data

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Abstract. Glaciers are recognized as a biome dominated by microorganisms and a reservoir of organic carbon and nutrients. Global warming remarkably increases glacier melting rate and runoff volume, which have significant impacts on the carbon and nitrogen cycles in downstream ecosystems. The Tibetan Plateau (TP), dubbed “the water tower of Asia”, owns the largest mountain glacial area at mid- and low-latitudes. However, limited data on the microbial abundance, organic carbon, and nitrogen in TP glaciers are available in the literature, which severely hinders our understanding of the regional carbon and nitrogen cycles. This work presents a new dataset on microbial abundance, dissolved organic carbon (DOC), and total nitrogen (TN) for TP glaciers. In this dataset, there are 5409 records from 12 glaciers for microbial abundance in ice cores and snow pits, and 2532 records from 38 glaciers for DOC and TN in the ice core, snow pit, surface ice, surface snow, and proglacial runoff. These glaciers are located across diverse geographic and climatic regions, where the multiyear average air temperature ranges from −13.4 to 2.9 ∘C and the multiyear average precipitation ranges from 76.9 to 927.8 mm. This makes the constructed dataset qualified for large-scale studies across the TP. To the best of our knowledge, this is the first dataset of microbial abundance and TN in TP glaciers and also the first dataset of DOC in ice cores of the TP. This new dataset provides important information for studies on carbon and nitrogen cycles in glacial ecosystems, and is especially valuable for the assessment of potential impacts of glacier retreat on downstream ecosystems under global warming. The dataset is available from the National Tibetan Plateau/Third Pole Environment Data Center (https://doi.org/10.11888/Cryos.tpdc.271841; Liu, 2021).

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Section: Laboratory Measurementsmentioning

confidence: 99%

A comprehensive dataset of microbial abundance, dissolved organic carbon, and nitrogen in Tibetan Plateau glaciers

Liu

Fang

Guo

et al. 2022

Earth Syst. Sci. Data

Self Cite

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“…Ice cores provide the highest resolution records of past climate states [10][11][12][13][14][15]. Of particular relevance to our study is their role as a refuge for micro-organisms, from the recent past [16,17] to millennia [18][19][20]. Ice microbes are taxonomically diverse and have a wide range of taxonomic relatives [9,19,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Biolocomotion and Premelting in Ice

Vachier

Wettlaufer

2022

Front. Phys.

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Biota are found in glaciers, ice sheets and permafrost. Ice bound micro-organisms evolve in a complex mobile environment facilitated or hindered by a range of bulk and surface interactions. When a particle is embedded in a host solid near its bulk melting temperature, a melted film forms at the surface of the particle in a process known as interfacial premelting. Under a temperature gradient, the particle is driven by a thermomolecular pressure gradient toward regions of higher temperatures in a process called thermal regelation. When the host solid is ice and the particles are biota, thriving in their environment requires the development of strategies, such as producing exopolymeric substances (EPS) and antifreeze glycoproteins (AFP) that enhance the interfacial water. Therefore, thermal regelation is enhanced and modified by a process we term bio-enhanced premelting. Additionally, the motion of bioparticles is influenced by chemical gradients influenced by nutrients within the icy host body. We show how the overall trajectory of bioparticles is controlled by a competition between thermal regelation and directed biolocomotion. By re-casting this class of regelation phenomena in the stochastic framework of active Ornstein-Uhlenbeck dynamics, and using multiple scales analysis, we find that for an attractive (repulsive) nutrient source, that thermal regelation is enhanced (suppressed) by biolocomotion. This phenomena is important in astrobiology, the biosignatures of extremophiles and in terrestrial paleoclimatology.

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Black carbon: a general review of its sources, analytical methods, and environmental effects in snow and ice in the Tibetan Plateau

Wang,

Luo,

Zhang

et al. 2023

Environ Sci Pollut Res

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Variation of High and Low Nucleic Acid-Content Bacteria in Tibetan Ice Cores and Their Relationship to Black Carbon

Cited by 5 publications

References 57 publications

A comprehensive dataset of microbial abundance, dissolved organic carbon, and nitrogen in Tibetan Plateau glaciers

A comprehensive dataset of microbial abundance, dissolved organic carbon, and nitrogen in Tibetan Plateau glaciers

Biolocomotion and Premelting in Ice

Black carbon: a general review of its sources, analytical methods, and environmental effects in snow and ice in the Tibetan Plateau

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