FEMS microbiology ecology最新文献_第7页

Exploring methanogenic archaea and their thermal responses in the glacier-fed stream sediments of Rongbuk River basin, Mt. Everest. 珠穆朗玛峰绒布江流域冰川水系沉积物中产甲烷古菌及其热响应研究。

IF 3.5 3区生物学

FEMS microbiology ecology Pub Date : 2025-04-14 DOI: 10.1093/femsec/fiaf044

Wei Ma, Miao Lin, Peihua Shen, Hongfei Chi, Weizhen Zhang, Jingyi Zhu, Shaoyi Tian, Pengfei Liu

{"title":"Exploring methanogenic archaea and their thermal responses in the glacier-fed stream sediments of Rongbuk River basin, Mt. Everest.","authors":"Wei Ma, Miao Lin, Peihua Shen, Hongfei Chi, Weizhen Zhang, Jingyi Zhu, Shaoyi Tian, Pengfei Liu","doi":"10.1093/femsec/fiaf044","DOIUrl":"https://doi.org/10.1093/femsec/fiaf044","url":null,"abstract":"Glacier-fed streams (GFS) are emergent sources of greenhouse gas methane, and methanogenic archaea in sediments contribute largely to stream methane emissions. However, little is known about the methanogenic communities in GFS sediments and their key environmental driving factors. This study analyzed stream sediments from the Rongbuk River basin on Mt. Everest for methanogenic communities and their temperature responses through anaerobic microcosm incubations at 5°C and 15°C. Diverse methanogens were identified, including acetoclastic, hydrogenotrophic, and hydrogen-dependent methylotrophic types. Substantial methane and CO2 production were detected across altitudes and increased significantly at 15°C, with both methane and CO2 production rates negatively correlated with altitude. The temperature sensitivity of CO2 production also showed a negative altitude correlation. Methanogens increased substantially over long-term incubation, dominating the archaeal community. At 15°C, the relative abundance of several methanogenic groups was strongly correlated with altitude, with positive correlations observed for Methanomassiliicoccaceae and Methanoregulaceae, and negative correlations for Methanocellaceae, respectively. Besides altitude, phosphorus, carbon to nitrogen ratio, and pH also affected methanogenic structure, methane and CO2 production, and temperature sensitivities. This study offers new insights into methanogens and methane production in GFS sediments, improving our understanding of GFS carbon cycling and its potential responses to climate change.","PeriodicalId":12312,"journal":{"name":"FEMS microbiology ecology","volume":"101 5","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12038898/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143981728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microplastic biofilms as potential hotspots for plastic biodegradation and nitrogen cycling: a metagenomic perspective. 微塑料生物膜作为塑料生物降解和氮循环的潜在热点：一个宏基因组的观点。

IF 3.5 3区生物学

FEMS microbiology ecology Pub Date : 2025-04-14 DOI: 10.1093/femsec/fiaf035

Samantha G Fortin, Kelley Uhlig, Robert C Hale, Bongkeun Song

{"title":"Microplastic biofilms as potential hotspots for plastic biodegradation and nitrogen cycling: a metagenomic perspective.","authors":"Samantha G Fortin, Kelley Uhlig, Robert C Hale, Bongkeun Song","doi":"10.1093/femsec/fiaf035","DOIUrl":"10.1093/femsec/fiaf035","url":null,"abstract":"Microplastics are an emerging contaminant worldwide, with the potential to impact organisms and facilitate the sorption and release of chemicals. Additionally, they create a novel habitat for microbial communities, forming biofilms known as the plastisphere. While the plastisphere has been studied in select aquatic environments, those in estuarine ecosystems merit additional attention due to their proximity to plastic debris sources. Additionally, the role plastisphere communities play in nutrient cycling has rarely been examined. This study used metagenomic analysis to investigate the taxonomic composition and functional genes of developing plastisphere communities living on petroleum-based (polyethylene and polyvinyl chloride) and biopolymer-based (polylactic acid) substrates. Isolated metagenome-assembled genomes (MAGs) showed plastisphere communities have the genes necessary to perform nitrification and denitrification and degrade petroleum and biopolymer-based plastics. The functions of these plastispheres have implications for estuarine nitrogen cycling and provide a possible explanation for the plastisphere microbes' competitiveness in biofilm environments. Overall, microplastics in the estuarine system provide a novel habitat for microbial communities and associated nitrogen cycling, facilitating the growth of microbes with plastic-degrading capabilities.","PeriodicalId":12312,"journal":{"name":"FEMS microbiology ecology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11995698/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143771820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Editorial: celebrating the biogeosphere at the joint meeting of International Societies for Environmental Biogeochemistry and Subsurface Microbiology. 社论：在国际环境生物地球化学和地下微生物学会的联合会议上庆祝生物地圈。

IF 3.5 3区生物学

FEMS microbiology ecology Pub Date : 2025-04-14 DOI: 10.1093/femsec/fiaf049

Lotta Purkamo, Maria Dittrich, Tillmann Lueders

引用次数: 0

Heterotrophic unicellular eukaryotes feeding on the unicellular red alga Cyanidiococcus sp. in moderately hot geothermal sulfuric springs. 异养单细胞真核生物，在中等热的地热硫酸泉中以单细胞红藻蓝藻为食。

IF 3.5 3区生物学

FEMS microbiology ecology Pub Date : 2025-04-14 DOI: 10.1093/femsec/fiaf048

Yuki Sunada, Dai Tsujino, Shota Yamashita, Wei-Hsun Hsieh, Kei Tamashiro, Jin Izumi, Fumi Yagisawa, Baifeng Zhou, Shunsuke Hirooka, Takayuki Fujiwara, Shin-Ya Miyagishima

{"title":"Heterotrophic unicellular eukaryotes feeding on the unicellular red alga Cyanidiococcus sp. in moderately hot geothermal sulfuric springs.","authors":"Yuki Sunada, Dai Tsujino, Shota Yamashita, Wei-Hsun Hsieh, Kei Tamashiro, Jin Izumi, Fumi Yagisawa, Baifeng Zhou, Shunsuke Hirooka, Takayuki Fujiwara, Shin-Ya Miyagishima","doi":"10.1093/femsec/fiaf048","DOIUrl":"https://doi.org/10.1093/femsec/fiaf048","url":null,"abstract":"Sulfuric acidic hot springs (<pH 4.0, >37°C) are found in volcanic regions worldwide, where various bacteria, archaea, and the unicellular red algae Cyanidiophyceae dominate. Regarding heterotrophic eukaryotes, the only known species was the thermophilic amoeboflagellate Tetramitus thermacidophilus (class Eutetramitea, phylum Heterolobosea), which feeds on surrounding bacteria and archaea. In this study, we investigated three sulfuric hot springs (34.7°C-50°C, ∼pH 2.0) in Japan to determine whether other heterotrophic eukaryotes inhabit these environments. As a result, we isolated and identified cultures of four species capable of surviving at pH 2.0 and 40°C: Allovahlkampfia sp. (Eutetramitea, Heterolobosea); Nuclearia sp. and Parvularia sp. (Nucleariidea, Cristidiscoidea); and Vannella sp. (Discosea, Amoebozoa). Phylogenetic analyses suggest that these four species independently evolved from mesophilic and neutrophilic ancestors, separate from each other. Additionally, Platyophrya sp. (Colpodea, Ciliophora) and two species of Neobodo (Euglenozoa, Kinetoplastea) were also found in the same environment, while their maximum survival temperatures were 35°C and 30°C, respectively. Among these, all species except Neobodo were confirmed to grow exclusively by feeding on Cyanidiococcus sp., a dominant species of Cyanidiophyceae in the environment. Thus, various lineages of heterotrophic unicellular eukaryotes have independently developed acidophilic and thermotolerant traits, allowing them to colonize sulfuric hot springs.","PeriodicalId":12312,"journal":{"name":"FEMS microbiology ecology","volume":"101 5","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12063673/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143987344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High diversity of nitrifying bacteria and archaea in biofilms from a subsea tunnel. 海底隧道生物膜中硝化细菌和古细菌的高度多样性。

IF 3.2 3区生物学

FEMS microbiology ecology Pub Date : 2025-04-14 DOI: 10.1093/femsec/fiaf032

Linnea F M Kop, Hanna Koch, Paula Dalcin Martins, Carolina Suarez, Sabina Karačić, Frank Persson, Britt-Marie Wilén, Per Hagelia, Mike S M Jetten, Sebastian Lücker

{"title":"High diversity of nitrifying bacteria and archaea in biofilms from a subsea tunnel.","authors":"Linnea F M Kop, Hanna Koch, Paula Dalcin Martins, Carolina Suarez, Sabina Karačić, Frank Persson, Britt-Marie Wilén, Per Hagelia, Mike S M Jetten, Sebastian Lücker","doi":"10.1093/femsec/fiaf032","DOIUrl":"10.1093/femsec/fiaf032","url":null,"abstract":"Microbial biofilm formation can contribute to the accelerated deterioration of steel-reinforced concrete structures and significantly impact their service life, making it critical to understand the diversity of the biofilm community and prevailing processes in these habitats. Here, we analyzed 16S rRNA gene amplicon and metagenomics sequencing data to study the abundance and diversity of nitrifiers within biofilms on the concrete surface of the Oslofjord subsea road tunnel in Norway. We showed that the abundance of nitrifiers varied greatly in time and space, with a mean abundance of 24.7 ± 15% but a wide range between 1.2% and 61.4%. We hypothesize that niche differentiation allows the coexistence of several nitrifier groups and that their high diversity increases the resilience to fluctuating environmental conditions. Strong correlations were observed between the nitrifying families Nitrosomonadaceae and Nitrospinaceae, and the iron-oxidizing family Mariprofundaceae. Metagenome-assembled genome analyses suggested that early Mariprofundaceae colonizers may provide a protected environment for nitrifiers in exchange for nitrogen compounds and vitamin B12, but further studies are needed to elucidate the spatial organization of the biofilms and the cooperative and competitive interactions in this environment. Together, this research provides novel insights into the diverse communities of nitrifiers living within biofilms on concrete surfaces and establishes a foundation for future experimental studies of concrete biofilms.","PeriodicalId":12312,"journal":{"name":"FEMS microbiology ecology","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11995701/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143742714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing the methanogenic activity of microbial communities enriched from a depleted reservoir. 枯竭储层富集的微生物群落产甲烷活性评估。

IF 3.5 3区生物学

FEMS microbiology ecology Pub Date : 2025-04-14 DOI: 10.1093/femsec/fiaf040

Arianna Vizzarro, Annalisa Abdel Azim, Ilaria Bassani, Ruggero Bellini, Nicolò Santi Vasile, Candido Fabrizio Pirri, Francesca Verga, Barbara Menin

{"title":"Assessing the methanogenic activity of microbial communities enriched from a depleted reservoir.","authors":"Arianna Vizzarro, Annalisa Abdel Azim, Ilaria Bassani, Ruggero Bellini, Nicolò Santi Vasile, Candido Fabrizio Pirri, Francesca Verga, Barbara Menin","doi":"10.1093/femsec/fiaf040","DOIUrl":"https://doi.org/10.1093/femsec/fiaf040","url":null,"abstract":"Using a depleted gas reservoir as a natural reactor is a novel approach for microbial methanation of hydrogen (H2) and carbon dioxide (CO2) into methane (CH4). This approach, known as underground biomethanation reactor (UMR), could enable the simultaneous valorization of geologically sequestered CO2 and the excess renewable energy, stored in the form of H2 in the same formation as the CO2. In this study, we explore the possibility to trigger biomethanation from formation water sample by testing various carbon sources (CO2, trypticase peptone, glucose, and acetate) in batch test with a defined mineral medium. Obtained results show that trypticase peptone supplementation greatly increased methane production and the enrichment of methanogenic archaea, outperforming alternative carbon sources. 16S rRNA amplicon sequencing of the enriched consortia revealed that supplementation of trypticase peptone and a mixture of H2:CO2 (80:20), resulted in the selection of a mixed culture dominated by microorganisms assigned to the Methanothermobacterium, Garciella, and Caminicella genera. Furthermore, KEGG (Kyoto Encyclopedia of Genes and Genomes) and COG (Clusters of Orthologous Genes) predictive functional analyses underline a possible syntrophic relationship, enhancing the conversion of H2 and CO2 into CH4. This work lays the groundwork for biologically exploiting a depleted gas reservoir by implementing the UMR technology.","PeriodicalId":12312,"journal":{"name":"FEMS microbiology ecology","volume":"101 5","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12054477/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143960683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Running against the clock: exploring microbial diversity in an extremely endangered microbial oasis in the Chihuahuan Desert. 与时间赛跑：在奇瓦瓦沙漠极度濒危的微生物绿洲中探索微生物多样性。

IF 3.5 3区生物学

FEMS microbiology ecology Pub Date : 2025-04-14 DOI: 10.1093/femsec/fiaf033

Ulises E Rodriguez-Cruz, Manuel Ochoa-Sánchez, Luis E Eguiarte, Valeria Souza

{"title":"Running against the clock: exploring microbial diversity in an extremely endangered microbial oasis in the Chihuahuan Desert.","authors":"Ulises E Rodriguez-Cruz, Manuel Ochoa-Sánchez, Luis E Eguiarte, Valeria Souza","doi":"10.1093/femsec/fiaf033","DOIUrl":"https://doi.org/10.1093/femsec/fiaf033","url":null,"abstract":"The Cuatro Ciénegas Basin is a biodiversity hotspot known for its unique biodiversity. However, this ecosystem is facing severe anthropogenic threats that are drying its aquatic systems. We investigated microbial communities at three sites with different physicochemical and environmental characteristics (Pozas Rojas, Archean Domes, and the Churince system) within the basin to explore potential connections to deep aquifers and determine if the sites shared microorganisms. Utilizing 16S rRNA gene data, we identified a core microbiota between Pozas Rojas (PR) and Archean Domes (AD). Sulfur reduction appears to shape the microbial connectivity among sites, since sulfur-reducing bacteria has the highest prevalence between samples from PR and AD: Halanaerobium sp. (88.46%) and Desulfovermiculus halophilus (65%); and between the Churince system and AD: Halanaerobium sp. (63%) and D. halophilus (60%). Furthermore, metagenome-assembled genomes from Ectothiorhodospira genus were found in both AD and Churince, suggesting microbial dispersal. An important finding is that microbial diversity in the AD system declined, from 2016 to 2023 the ecosystem lost 29 microbial phyla. If this trend continues, the basin will lose most of its water, resulting in the loss of various prokaryotic lineages and potential biotechnological solutions, such as enzymes or novel antibiotics. Our findings highlighting the need for water extraction regulations to preserve the basin's biodiversity.","PeriodicalId":12312,"journal":{"name":"FEMS microbiology ecology","volume":"101 5","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11995699/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143976772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Halo-tolerant plant growth-promoting bacteria-mediated plant salt resistance and microbiome-based solutions for sustainable agriculture in saline soils. 耐盐植物生长促进菌介导的植物抗盐性和基于微生物组的盐碱地可持续农业解决方案。

IF 3.5 3区生物学

FEMS microbiology ecology Pub Date : 2025-04-14 DOI: 10.1093/femsec/fiaf037

Hui-Ping Li, Hong-Bin Ma, Jin-Lin Zhang

{"title":"Halo-tolerant plant growth-promoting bacteria-mediated plant salt resistance and microbiome-based solutions for sustainable agriculture in saline soils.","authors":"Hui-Ping Li, Hong-Bin Ma, Jin-Lin Zhang","doi":"10.1093/femsec/fiaf037","DOIUrl":"10.1093/femsec/fiaf037","url":null,"abstract":"Soil salinization has been the major form of soil degradation under the dual influence of climate change and high-intensity human activities, threatening global agricultural sustainability and food security. High salt concentrations induce osmotic imbalance, ion stress, oxidative damage, and other hazards to plants, resulting in retarded growth, reduced biomass, and even total crop failure. Halo-tolerant plant growth promoting rhizobacteria (HT-PGPR), as a widely distributed group of beneficial soil microorganisms, are emerging as a valuable biological tool for mitigating the toxic effects of high salt concentrations and improve plant growth while remediating degraded saline soil. Here, the current status, harm, and treatment measures of global soil salinization are summarized. The mechanism of salt tolerance and growth promotion induced by HT-PGPR are reviewed. We highlight that advances in multiomics technologies are helpful for exploring the genetic and molecular mechanisms of microbiota centered on HT-PGPR to address the issue of plant losses in saline soil. Future research is urgently needed to comprehensively and robustly determine the interaction mechanism between the root microbiome centered on HT-PGPR and salt-stressed plants via advanced means to maximize the efficacy of HT-PGPR as a microbial agent.","PeriodicalId":12312,"journal":{"name":"FEMS microbiology ecology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12051855/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143803027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Contrasting alpha, beta, and gamma diversity in the littoral zones of mountain lakes: effects of habitat size and within-lake community structuring on bacterial biogeography. 山地湖泊沿岸α、β和γ多样性对比：生境大小和湖内群落结构对细菌生物地理学的影响

IF 3.5 3区生物学

FEMS microbiology ecology Pub Date : 2025-03-18 DOI: 10.1093/femsec/fiaf026

Andreas Härer, Joshua Dominguez, Jonathan B Shurin, Diana J Rennison

{"title":"Contrasting alpha, beta, and gamma diversity in the littoral zones of mountain lakes: effects of habitat size and within-lake community structuring on bacterial biogeography.","authors":"Andreas Härer, Joshua Dominguez, Jonathan B Shurin, Diana J Rennison","doi":"10.1093/femsec/fiaf026","DOIUrl":"10.1093/femsec/fiaf026","url":null,"abstract":"Research on microbial biogeography has revealed key patterns like the diversity-area relationship and distance-decay of similarity. However, how habitat size affects bacterial diversity in freshwater environments remains largely unclear. Here, we characterize bacterial communities in the littoral zones of 10 mountain lakes in the Sierra Nevada, CA, ranging in surface area from 0.92 to 71.72 ha. Despite significant habitat size effects on community composition, dominant bacterial phyla were shared across lakes. We found no evidence for diversity-area relationships, either in single samples (alpha diversity) or cumulative lake-level samples (within-lake gamma diversity), when accounting for environmental variation. Moreover, within-lake beta diversity showed little spatial structuring, with similar bacterial community composition across samples regardless of geographic distance. Gamma diversity did not reach saturation with our sample size, and lake size had no effect on the predicted sample size necessary to reach gamma diversity saturation. Our findings offer new insights into diversity-area dynamics and spatial structuring by investigating alpha, beta, and gamma diversity in freshwater environments. Notably, individual water samples captured much of the bacterial community, with strong correlations between alpha and gamma diversity. These results advance our understanding of microbial biogeography and inform sampling designs for characterizing bacterial diversity in freshwater ecosystems.","PeriodicalId":12312,"journal":{"name":"FEMS microbiology ecology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11963758/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143647862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cryptic iron cycling influenced by organic carbon availability in a seasonally stratified lake. 季节性分层湖泊中有机碳有效性对隐铁循环的影响

IF 3.5 3区生物学

FEMS microbiology ecology Pub Date : 2025-03-18 DOI: 10.1093/femsec/fiaf029

Verena Nikeleit, Markus Maisch, Daniel Straub, Sümeyya Eroglu, Jimena C Lopez-Rivoldi, Harald Strauss, Fin Ring-Hrubesh, James M Byrne, Andreas Kappler, Casey Bryce

{"title":"Cryptic iron cycling influenced by organic carbon availability in a seasonally stratified lake.","authors":"Verena Nikeleit, Markus Maisch, Daniel Straub, Sümeyya Eroglu, Jimena C Lopez-Rivoldi, Harald Strauss, Fin Ring-Hrubesh, James M Byrne, Andreas Kappler, Casey Bryce","doi":"10.1093/femsec/fiaf029","DOIUrl":"10.1093/femsec/fiaf029","url":null,"abstract":"Iron cycling including phototrophic Fe(II) oxidation has been observed in multiple permanently stratified meromictic lakes, yet less focus has been on dimictic lakes, which seasonally overturn and are vastly more common. Here, we investigated iron cycling in a dimictic lake, Großes Heiliges Meer in northwest Germany, using 16S rRNA amplicon sequencing, as well as in-situ and lab-based experiments. Bacterial community composition in the lake follows geochemical gradients and differs markedly between oxic and anoxic conditions. Potential iron-metabolizing bacteria were found mostly in anoxic conditions at 7 and 8 m depth and were comprised of taxa from the genera Chlorobium, Thiodictyon, Sideroxydans, Geobacter, and Rhodoferrax. We were able to recreate active iron cycling (1) with an ex-situ microbial community from 8 m depth and (2) with a successful microbial enrichment culture from 7 m depth. Varying the light and organic carbon availability in lab-based experiments showed that Fe(III) reduction overshadows Fe(II) oxidation leading to a cryptic iron cycle. Overall, we could demonstrate that microbial iron cycling can be a key biogeochemical process in dimictic lakes despite regular disturbance, and that complex environmental factors such as organic substrates control the balance between Fe(II) oxidation and Fe(III) reduction.","PeriodicalId":12312,"journal":{"name":"FEMS microbiology ecology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11974394/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143669188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0