Girish R Nair, Bhaveni B Kooverjee, Storme de Scally, Don A Cowan, Thulani P Makhalanyane
{"title":"养分供应的变化极大地改变了南极土壤中的细菌和细胞外酶活性","authors":"Girish R Nair, Bhaveni B Kooverjee, Storme de Scally, Don A Cowan, Thulani P Makhalanyane","doi":"10.1093/femsec/fiae071","DOIUrl":null,"url":null,"abstract":"In polar regions, global warming has accelerated the melting of glacial and buried ice, resulting meltwater run-off and mobilisation of surface nutrients. Yet, the short-term effects of altered nutrient regimes, on the diversity and function of soil microbiota in poly-extreme environments such as Antarctica, remains poorly understood. We studied these effects by simulating such environments via constructing soil microcosms through augmented carbon, nitrogen, and moisture supplements. Addition of nitrogen significantly decreased the diversity of Antarctic soil microbial assemblages, compared with other treatment groups. Other treatments led to shift in relative abundances of these microbial assemblages with random distributional patterns. Only nitrogen treatment appeared to show clear community structural patterns, with increase in abundance of Proteobacteria (Gammaproteobateria) and decrease in Verrucomicrobiota (Chlamydiae, Verrucomicrobiae). Effects of extracellular enzyme activities and soil parameters on changes in microbial taxa also showed significance impacts of nitrogen treatment. Microbial response to nutrient addition was predicted using structural equation modelling which revealed that nutrient source and extracellular enzyme activities were positive predictors of microbial diversity. Our study highlights the effect of nitrogen addition on Antarctic soil microorganisms which showed resilience to nutrient increases. Rather than being resistant to change, these microorganisms rapidly responded to augmented nutrient regimes.","PeriodicalId":12312,"journal":{"name":"FEMS microbiology ecology","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Changes in nutrient availability substantially alter bacteria and extracellular enzymatic activities in Antarctic soils\",\"authors\":\"Girish R Nair, Bhaveni B Kooverjee, Storme de Scally, Don A Cowan, Thulani P Makhalanyane\",\"doi\":\"10.1093/femsec/fiae071\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In polar regions, global warming has accelerated the melting of glacial and buried ice, resulting meltwater run-off and mobilisation of surface nutrients. Yet, the short-term effects of altered nutrient regimes, on the diversity and function of soil microbiota in poly-extreme environments such as Antarctica, remains poorly understood. We studied these effects by simulating such environments via constructing soil microcosms through augmented carbon, nitrogen, and moisture supplements. Addition of nitrogen significantly decreased the diversity of Antarctic soil microbial assemblages, compared with other treatment groups. Other treatments led to shift in relative abundances of these microbial assemblages with random distributional patterns. Only nitrogen treatment appeared to show clear community structural patterns, with increase in abundance of Proteobacteria (Gammaproteobateria) and decrease in Verrucomicrobiota (Chlamydiae, Verrucomicrobiae). Effects of extracellular enzyme activities and soil parameters on changes in microbial taxa also showed significance impacts of nitrogen treatment. Microbial response to nutrient addition was predicted using structural equation modelling which revealed that nutrient source and extracellular enzyme activities were positive predictors of microbial diversity. Our study highlights the effect of nitrogen addition on Antarctic soil microorganisms which showed resilience to nutrient increases. 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Changes in nutrient availability substantially alter bacteria and extracellular enzymatic activities in Antarctic soils
In polar regions, global warming has accelerated the melting of glacial and buried ice, resulting meltwater run-off and mobilisation of surface nutrients. Yet, the short-term effects of altered nutrient regimes, on the diversity and function of soil microbiota in poly-extreme environments such as Antarctica, remains poorly understood. We studied these effects by simulating such environments via constructing soil microcosms through augmented carbon, nitrogen, and moisture supplements. Addition of nitrogen significantly decreased the diversity of Antarctic soil microbial assemblages, compared with other treatment groups. Other treatments led to shift in relative abundances of these microbial assemblages with random distributional patterns. Only nitrogen treatment appeared to show clear community structural patterns, with increase in abundance of Proteobacteria (Gammaproteobateria) and decrease in Verrucomicrobiota (Chlamydiae, Verrucomicrobiae). Effects of extracellular enzyme activities and soil parameters on changes in microbial taxa also showed significance impacts of nitrogen treatment. Microbial response to nutrient addition was predicted using structural equation modelling which revealed that nutrient source and extracellular enzyme activities were positive predictors of microbial diversity. Our study highlights the effect of nitrogen addition on Antarctic soil microorganisms which showed resilience to nutrient increases. Rather than being resistant to change, these microorganisms rapidly responded to augmented nutrient regimes.
期刊介绍:
FEMS Microbiology Ecology aims to ensure efficient publication of high-quality papers that are original and provide a significant contribution to the understanding of microbial ecology. The journal contains Research Articles and MiniReviews on fundamental aspects of the ecology of microorganisms in natural soil, aquatic and atmospheric habitats, including extreme environments, and in artificial or managed environments. Research papers on pure cultures and in the areas of plant pathology and medical, food or veterinary microbiology will be published where they provide valuable generic information on microbial ecology. Papers can deal with culturable and non-culturable forms of any type of microorganism: bacteria, archaea, filamentous fungi, yeasts, protozoa, cyanobacteria, algae or viruses. In addition, the journal will publish Perspectives, Current Opinion and Controversy Articles, Commentaries and Letters to the Editor on topical issues in microbial ecology.
- Application of ecological theory to microbial ecology
- Interactions and signalling between microorganisms and with plants and animals
- Interactions between microorganisms and their physicochemical enviornment
- Microbial aspects of biogeochemical cycles and processes
- Microbial community ecology
- Phylogenetic and functional diversity of microbial communities
- Evolutionary biology of microorganisms