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Yue L, Kong W, Li C, Zhu G, Zhu L, Makhalanyane TP, Cowan DA. Dissolved inorganic carbon determines the abundance of microbial primary producers and primary production in Tibetan Plateau lakes. FEMS Microbiol Ecol 2021; 97:6006872. [PMID: 33242086 DOI: 10.1093/femsec/fiaa242] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 11/24/2020] [Indexed: 11/13/2022] Open
Abstract
Climate change globally accelerates the shrinkage of inland lakes, resulting in increases in both water salinity and dissolved inorganic carbon (DIC). The increases of salinity and DIC generate contrasting effects on microbial primary producers and primary production, however, their combined effects remain unclear in aquatic ecosystems. We hypothesized that increased DIC mitigates the constraints of enhanced salinity on microbial primary producers and primary production. To test this, we employed isotope labeling and molecular methods to explore primary production and four dominant types of microbial primary producers (form IA, IB, IC and ID) in lakes on the Tibetan Plateau. Results showed that DIC was positively correlated with the abundance of the form IAB and ID microbial primary producers and primary production (all P < 0.001) and offset salinity constraints. Structural equation models elucidated that DIC substantially enhanced primary production by stimulating the abundance of form ID microbial primary producers. The abundance of form ID primary producers explained more variations (14.6%) of primary production than form IAB (6%) and physicochemical factors (6.8%). Diatoms (form ID) played a determinant role in primary production in the lakes by adapting to high DIC and high salinity. Our findings suggest that inland lakes may support higher primary productivity in future climate change scenarios.
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Affiliation(s)
- Linyan Yue
- Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing 100101, China.,College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China.,Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria 0028, South Africa
| | - Weidong Kong
- Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing 100101, China.,College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China.,College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100039, China
| | - Chunge Li
- CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China
| | - Guibing Zhu
- College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China.,CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China
| | - Liping Zhu
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100039, China.,Key Lab Drinking Water Science & Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100086, China
| | - Thulani P Makhalanyane
- Key Laboratory of Tibetan Environmental Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Don A Cowan
- Key Laboratory of Tibetan Environmental Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
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Kuznetsova AI, Ivanova EA, Samylina OS, Kurbanova FG, Gruzdev DS, Kanapatskiy TA, Pimenov NV. Prokaryotic Communities in Saline Soils of the Lake Elton Area in a Soil Catena along the Khara River. Microbiology (Reading) 2020. [DOI: 10.1134/s0026261720060119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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Methanogenesis in the Lake Elton saline aquatic system. Extremophiles 2020; 24:657-672. [PMID: 32533307 DOI: 10.1007/s00792-020-01185-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Accepted: 06/08/2020] [Indexed: 12/26/2022]
Abstract
Cultivation and molecular approaches were used to study methanogenesis in saline aquatic system of the Lake Elton (southern Russia), the largest hypersaline lake in Europe. The potential rates of hydrogenotrophic, acetoclastic, methylotrophic and methyl-reducing methanogenesis and diversity of the growth-enriched for by adding electron donors methanogenic communities were studied in the sediment slurry incubations at salinity range from 7 to 275 g/L. The most active pathway detected at all salinities was methylotrophic with a dominance of Methanohalobium and Methanohalophilus genera, at salt saturation and moderately halophilic Methanolobus and Methanococcoides at lower salinity. The absence of methane production from acetate, formate and H2/CO2 under hypersaline conditions was most probably associated with the energy constraints. The contribution of hydrogenotrophic, acetoclastic, and methyl-reducing methanogens to the community increases with a decrease in salinity. Temperature might play an important regulatory function in hypersaline habitats; i.e. methylotrophic methanogens and hydrogenotrophic sulfate-reducing bacteria (SRB) outcompeting methyl-reducing methanogens under mesophilic conditions, and vice versa under thermophilic conditions. An active methane production together with negligible methane oxidation makes hypersaline environments a potential source of methane emission.
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