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219 results on '"Liu, Keshao"'

15. Salinity as a key factor affecting viral activity and life strategies in alpine lakes.

Author

Zang, Lin, Liu, Yongqin, Jiao, Nianzhi, Zhong, Kevin Xu, Song, Xuanying, Yang, Yunlan, Cai, Lanlan, Liu, Keshao, Mao, Guannan, Ji, Mukan, and Zhang, Rui

Subjects
LAKES, SALINITY, LYSIS, CLIMATE change, LYSOGENY, CARBON cycle, MOUNTAIN soils
Abstract

Viruses are major players in the biosphere, yet little is known about their dynamics and life strategies in alpine lakes, particularly those on the Tibetan Plateau. We investigated microbial abundance, viral dynamics, and viral life strategies in 10 high‐altitude Tibetan lakes and found that they harbor high levels of active viruses. Salinity was identified as a crucial factor influencing viral abundance, dynamics, as well as viral life strategies. Lytic and lysogenic viral productions in moderate‐ and high‐salinity lakes were significantly higher than those in freshwater lakes. A trade‐off between viral life strategies resulted in a switch from lysis to lysogeny in high‐salinity lakes. Virus‐mediated cell lysis and virus decay in sampled Tibetan lakes could release about 162.72 and 2.84 μg C L−1 d−1, respectively. These findings revealed the crucial role of viruses in the carbon cycle of Tibetan lakes, and a switch in viral life strategies may impact their contribution to the carbon cycle. The potential impact of salinity changes triggered by climate change on the carbon cycle in alpine lakes worldwide is highlighted. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Habitat-specific patterns of bacterial communities in a glacier-fed lake on the Tibetan Plateau.

Author

Guo, Xuezi, Yan, Qi, Wang, Feng, Wang, Wenqiang, Zhang, Zhihao, Liu, Yongqin, and Liu, Keshao

Subjects
BACTERIAL communities, LAKES, WATER temperature, WATER sampling, BACTERIAL diversity, MICROBIAL communities, ECOSYSTEMS
Abstract

Different types of inlet water are expected to affect microbial communities of lake ecosystems due to changing environmental conditions and the dispersal of species. However, knowledge of the effects of changes in environmental conditions and export of microbial assemblages on lake ecosystems is limited, especially for glacier-fed lakes. Here, we collected water samples from the surface water of a glacier-fed lake and its two fed streams on the Tibetan Plateau to investigate the importance of glacial and non-glacial streams as sources of diversity for lake bacterial communities. Results showed that the glacial stream was an important source of microorganisms in the studied lake, contributing 45.53% to the total bacterial community in the lake water, while only 19.14% of bacterial community in the lake water was seeded by the non-glacial stream. Bacterial communities were significantly different between the glacier-fed lake and its two fed streams. pH, conductivity, total dissolved solids, water temperature and total nitrogen had a significant effect on bacterial spatial turnover, and together explained 36.2% of the variation of bacterial distribution among habitats. Moreover, bacterial co-occurrence associations tended to be stronger in the lake water than in stream habitats. Collectively, this study may provide an important reference for assessing the contributions of different inlet water sources to glacier-fed lakes. [ABSTRACT FROM AUTHOR]

Published
2024
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23. Bacterial Communities in Cryoconite Holes of the Adjacent Glaciers on the Tibetan Plateau

Author

Wang, Wenqiang, Liu, Yongqin, Liu, Keshao, Yan, Qi, Ji, Mukang, Wang, Feng, and Zhang, Zhihao

Abstract

Cryoconite holes are biological hotspots on the glacier surface. Cryoconite bacterial communities are strongly spatially heterogeneous at the regional scale which is closely associated with environmental variables and geographic distance. However, knowledge about the distribution patterns of cryoconite bacterial communities at a small scale and the underlying drivers is still limited. Here, we investigated bacterial communities in cryoconite holes of two adjacent glaciers of Tangula mountain range, DKMD (Dongkemadi) and LXZLB (Longxiazailongba) glacier, on the Tibetan Plateau using amplicon sequencing of the 16S rRNA gene. Cryoconite bacteria on the two glaciers have similar alpha diversity, but significantly different community compositions. Geospatial factors were the most important drivers (24.0% of the community variation) for predicting the cryoconite bacterial beta diversity in both glaciers. Latitude was the primary driver of the beta diversity of bacterial communities in the DKMD glacier, while the depth of the cryoconite holes played a dominant role in the LXZLB glacier. Collectively, these results demonstrated cryoconite bacterial communities exhibited spatial heterogeneity even at the small local scale and highlighted the importance of morphological properties of cryoconite holes instructing the distribution of cryoconite bacterial communities.

Published
2023
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33. Sink or Source: Alternative Roles of Glacier Foreland Meadow Soils in Methane Emission Is Regulated by Glacier Melting on the Tibetan Plateau

Author

Xing, Tingting, Liu, Pengfei, Ji, Mukan, Deng, Yongcui, Liu, Keshao, Wang, Wenqiang, and Liu, Yongqin

Subjects
Microbiology (medical), Microbiology
Abstract

Glacier foreland soils have long been considered as methane (CH4) sinks. However, they are flooded by glacial meltwater annually during the glacier melting season, altering their redox potential. The impacts of this annual flooding on CH4 emission dynamics and methane-cycling microorganisms are not well understood. Herein, we measured in situ methane flux in glacier foreland soils during the pre-melting and melting seasons on the Tibetan Plateau. In addition, high-throughput sequencing and qPCR were used to investigate the diversity, taxonomic composition, and the abundance of methanogenic archaea and methanotrophic bacteria. Our results showed that the methane flux ranged from −10.11 to 4.81 μg·m−2·h−1 in the pre-melting season, and increased to 7.48–22.57 μg·m−2·h−1 in the melting season. This indicates that glacier foreland soils change from a methane sink to a methane source under the impact of glacial meltwater. The extent of methane flux depends on methane production and oxidation conducted by methanogens and methanotrophs. Among all the environmental factors, pH (but not moisture) is dominant for methanogens, while both pH and moisture are not that strong for methanotrophs. The dominant methanotrophs were Methylobacter and Methylocystis, whereas the methanogens were dominated by methylotrophic Methanomassiliicoccales and hydrogenotrophic Methanomicrobiales. Their distributions were also affected by microtopography and environmental factor differences. This study reveals an alternative role of glacier foreland meadow soils as both methane sink and source, which is regulated by the annual glacial melt. This suggests enhanced glacial retreat may positively feedback global warming by increasing methane emission in glacier foreland soils in the context of climate change.

Published
2022

34. Compatibility of Diatom Valve Records With Sedimentary Ancient DNA Amplicon Data: A Case Study in a Brackish, Alkaline Tibetan Lake

Author

Anslan, Sten, primary, Kang, Wengang, additional, Dulias, Katharina, additional, Wünnemann, Bernd, additional, Echeverría-Galindo, Paula, additional, Börner, Nicole, additional, Schwarz, Anja, additional, Liu, Yongqin, additional, Liu, Keshao, additional, Künzel, Sven, additional, Kisand, Veljo, additional, Rioual, Patrick, additional, Peng, Ping, additional, Wang, Junbo, additional, Zhu, Liping, additional, Vences, Miguel, additional, and Schwalb, Antje, additional

Published
2022
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