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Branco RHR, Meulepas RJW, Sekar P, van Veelen HPJ, Rijnaarts HHM, Sutton NB. Biostimulation with oxygen and electron donors supports micropollutant biodegradation in an experimentally simulated nitrate-reducing aquifer. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 928:172339. [PMID: 38608893 DOI: 10.1016/j.scitotenv.2024.172339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 03/16/2024] [Accepted: 04/07/2024] [Indexed: 04/14/2024]
Abstract
The availability of suitable electron donors and acceptors limits micropollutant natural attenuation in oligotrophic groundwater. This study investigated how electron donors with different biodegradability (humics, dextran, acetate, and ammonium), and different oxygen concentrations affect the biodegradation of 15 micropollutants (initial concentration of each micropollutant = 50 μg/L) in simulated nitrate reducing aquifers. Tests mimicking nitrate reducing field conditions showed no micropollutant biodegradation, even with electron donor amendment. However, 2,4-dichlorophenoxyacetic acid and mecoprop were biodegraded under (micro)aerobic conditions with and without electron donor addition. The highest 2,4-dichlorophenoxyacetic acid and mecoprop biodegradation rates and removal efficiencies were obtained under fully aerobic conditions with amendment of an easily biodegradable electron donor. Under microaerobic conditions, however, amendment with easily biodegradable dissolved organic carbon (DOC) inhibited micropollutant biodegradation due to competition between micropollutants and DOC for the limited oxygen available. Microbial community composition was dictated by electron acceptor availability and electron donor amendment, not by micropollutant biodegradation. Low microbial community richness and diversity led to the absence of biodegradation of the other 13 micropollutants (such as bentazon, chloridazon, and carbamazepine). Finally, adaptation and potential growth of biofilms interactively determined the location of the micropollutant removal zone relative to the point of amendment. This study provides new insight on how to stimulate in situ micropollutant biodegradation to remediate oligotrophic groundwaters as well as possible limitations of this process.
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Affiliation(s)
- Rita H R Branco
- Environmental Technology, Wageningen University & Research, P.O. Box 47, 6700 AA Wageningen, the Netherlands; Wetsus, European Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900 CC Leeuwarden, the Netherlands
| | - Roel J W Meulepas
- Wetsus, European Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900 CC Leeuwarden, the Netherlands
| | - Priyadharshini Sekar
- Environmental Technology, Wageningen University & Research, P.O. Box 47, 6700 AA Wageningen, the Netherlands; Wetsus, European Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900 CC Leeuwarden, the Netherlands
| | - H Pieter J van Veelen
- Wetsus, European Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900 CC Leeuwarden, the Netherlands
| | - Huub H M Rijnaarts
- Environmental Technology, Wageningen University & Research, P.O. Box 47, 6700 AA Wageningen, the Netherlands
| | - Nora B Sutton
- Environmental Technology, Wageningen University & Research, P.O. Box 47, 6700 AA Wageningen, the Netherlands.
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2
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Kang M, Liu L, Grossart HP. Spatio-temporal variations of methane fluxes in sediments of a deep stratified temperate lake. iScience 2024; 27:109520. [PMID: 38591008 PMCID: PMC11000008 DOI: 10.1016/j.isci.2024.109520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 12/09/2023] [Accepted: 03/14/2024] [Indexed: 04/10/2024] Open
Abstract
Spatio-temporal variability of sediment-mediated methane (CH4) production in freshwater lakes causes large uncertainties in predicting global lake CH4 emissions under different climate change and eutrophication scenarios. We conducted extensive sediment incubation experiments to investigate CH4 fluxes in Lake Stechlin, a deep, stratified temperate lake. Our results show contrasting spatial patterns in CH4 fluxes between littoral and profundal sites. The littoral sediments, ∼33% of the total sediment surface area, contributed ∼86.9% of the annual CH4 flux at the sediment-water interface. Together with sediment organic carbon quality, seasonal stratification is responsible for the striking spatial difference in sediment CH4 production between littoral and profundal zones owing to more sensitive CH4 production than oxidation to warming. While profundal sediments produce a relatively small amount of CH4, its production increases markedly as anoxia spreads in late summer. Our measurements indicate that future lake CH4 emissions will increase due to climate warming and concomitant hypoxia/anoxia.
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Affiliation(s)
- Manchun Kang
- Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Yichang 443002, China
- Hubei Field Observation and Scientific Research Stations for Water Ecosystem in Three Gorges Reservoir, Yichang 443002, China
| | - Liu Liu
- Yunnan Key Laboratory of Plateau Geographical Processes and Environmental Changes, Faculty of Geography, Yunnan Normal University, Kunming 650500, China
- Department of Plankton and Microbial Ecology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, 16775 Stechlin, Germany
| | - Hans-Peter Grossart
- Department of Plankton and Microbial Ecology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, 16775 Stechlin, Germany
- Institute of Biochemistry and Biology, Potsdam University, 14476 Potsdam, Germany
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3
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Carey CC, Hanson PC, Thomas RQ, Gerling AB, Hounshell AG, Lewis ASL, Lofton ME, McClure RP, Wander HL, Woelmer WM, Niederlehner BR, Schreiber ME. Anoxia decreases the magnitude of the carbon, nitrogen, and phosphorus sink in freshwaters. GLOBAL CHANGE BIOLOGY 2022; 28:4861-4881. [PMID: 35611634 PMCID: PMC9543840 DOI: 10.1111/gcb.16228] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 02/11/2021] [Accepted: 04/29/2022] [Indexed: 06/08/2023]
Abstract
Oxygen availability is decreasing in many lakes and reservoirs worldwide, raising the urgency for understanding how anoxia (low oxygen) affects coupled biogeochemical cycling, which has major implications for water quality, food webs, and ecosystem functioning. Although the increasing magnitude and prevalence of anoxia has been documented in freshwaters globally, the challenges of disentangling oxygen and temperature responses have hindered assessment of the effects of anoxia on carbon, nitrogen, and phosphorus concentrations, stoichiometry (chemical ratios), and retention in freshwaters. The consequences of anoxia are likely severe and may be irreversible, necessitating ecosystem-scale experimental investigation of decreasing freshwater oxygen availability. To address this gap, we devised and conducted REDOX (the Reservoir Ecosystem Dynamic Oxygenation eXperiment), an unprecedented, 7-year experiment in which we manipulated and modeled bottom-water (hypolimnetic) oxygen availability at the whole-ecosystem scale in a eutrophic reservoir. Seven years of data reveal that anoxia significantly increased hypolimnetic carbon, nitrogen, and phosphorus concentrations and altered elemental stoichiometry by factors of 2-5× relative to oxic periods. Importantly, prolonged summer anoxia increased nitrogen export from the reservoir by six-fold and changed the reservoir from a net sink to a net source of phosphorus and organic carbon downstream. While low oxygen in freshwaters is thought of as a response to land use and climate change, results from REDOX demonstrate that low oxygen can also be a driver of major changes to freshwater biogeochemical cycling, which may serve as an intensifying feedback that increases anoxia in downstream waterbodies. Consequently, as climate and land use change continue to increase the prevalence of anoxia in lakes and reservoirs globally, it is likely that anoxia will have major effects on freshwater carbon, nitrogen, and phosphorus budgets as well as water quality and ecosystem functioning.
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Affiliation(s)
- Cayelan C. Carey
- Department of Biological SciencesVirginia TechBlacksburgVirginiaUSA
| | - Paul C. Hanson
- Center for LimnologyUniversity of Wisconsin‐MadisonMadisonWisconsinUSA
| | - R. Quinn Thomas
- Department of Biological SciencesVirginia TechBlacksburgVirginiaUSA
- Department of Forest Resources and Environmental ConservationVirginia TechBlacksburgVirginiaUSA
| | | | | | | | - Mary E. Lofton
- Department of Biological SciencesVirginia TechBlacksburgVirginiaUSA
| | - Ryan P. McClure
- Department of Biological SciencesVirginia TechBlacksburgVirginiaUSA
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4
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Carey CC, Hanson PC, Thomas RQ, Gerling AB, Hounshell AG, Lewis ASL, Lofton ME, McClure RP, Wander HL, Woelmer WM, Niederlehner BR, Schreiber ME. Anoxia decreases the magnitude of the carbon, nitrogen, and phosphorus sink in freshwaters. GLOBAL CHANGE BIOLOGY 2022. [PMID: 35611634 DOI: 10.5281/zenodo.6520742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Oxygen availability is decreasing in many lakes and reservoirs worldwide, raising the urgency for understanding how anoxia (low oxygen) affects coupled biogeochemical cycling, which has major implications for water quality, food webs, and ecosystem functioning. Although the increasing magnitude and prevalence of anoxia has been documented in freshwaters globally, the challenges of disentangling oxygen and temperature responses have hindered assessment of the effects of anoxia on carbon, nitrogen, and phosphorus concentrations, stoichiometry (chemical ratios), and retention in freshwaters. The consequences of anoxia are likely severe and may be irreversible, necessitating ecosystem-scale experimental investigation of decreasing freshwater oxygen availability. To address this gap, we devised and conducted REDOX (the Reservoir Ecosystem Dynamic Oxygenation eXperiment), an unprecedented, 7-year experiment in which we manipulated and modeled bottom-water (hypolimnetic) oxygen availability at the whole-ecosystem scale in a eutrophic reservoir. Seven years of data reveal that anoxia significantly increased hypolimnetic carbon, nitrogen, and phosphorus concentrations and altered elemental stoichiometry by factors of 2-5× relative to oxic periods. Importantly, prolonged summer anoxia increased nitrogen export from the reservoir by six-fold and changed the reservoir from a net sink to a net source of phosphorus and organic carbon downstream. While low oxygen in freshwaters is thought of as a response to land use and climate change, results from REDOX demonstrate that low oxygen can also be a driver of major changes to freshwater biogeochemical cycling, which may serve as an intensifying feedback that increases anoxia in downstream waterbodies. Consequently, as climate and land use change continue to increase the prevalence of anoxia in lakes and reservoirs globally, it is likely that anoxia will have major effects on freshwater carbon, nitrogen, and phosphorus budgets as well as water quality and ecosystem functioning.
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Affiliation(s)
- Cayelan C Carey
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA
| | - Paul C Hanson
- Center for Limnology, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - R Quinn Thomas
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA
- Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, Virginia, USA
| | | | | | - Abigail S L Lewis
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA
| | - Mary E Lofton
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA
| | - Ryan P McClure
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA
| | - Heather L Wander
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA
| | - Whitney M Woelmer
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA
| | - B R Niederlehner
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA
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5
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Aguirrezabala-Cámpano T, Gonzalez-Valencia R, García-Pérez V, Torres-Alvarado R, Pangala SR, Thalasso F. Spatial and seasonal dynamics of the methane cycle in a tropical coastal lagoon and its tributary river. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 825:154074. [PMID: 35217060 DOI: 10.1016/j.scitotenv.2022.154074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/16/2022] [Accepted: 02/17/2022] [Indexed: 06/14/2023]
Abstract
Coastal aquatic ecosystems such as estuaries and coastal lagoons are important atmospheric methane sources that must be better constrained. This work presents a detailed characterization of the methane cycle in a tropical coastal lagoon (La Mancha, Veracruz, Mexico) and its tributary river over three distinct seasons, along a transect from the river to the sea connection. In addition to several physicochemical parameters, the dissolved methane, carbon dioxide, and oxygen concentrations were measured with high resolution in the sediments and the water column, combined with production/uptake rates. Methane and carbon dioxide cycles were further constrained by determining atmospheric flux over the entire river and lagoon sections. The results indicate that La Mancha is a highly contrasted ecosystem. The river section is characterized by a strong pycnocline, relatively high methane concentration, and active methanogenesis and methanotrophy, discharging into a relatively homogeneous lagoon section where the methane and carbon cycles are less active. Overall, both the river and the lagoon were a net source of methane and carbon dioxide, with an annual emission of 2.9 metric tons of methane and 2757 metric tons of carbon dioxide. The spatial structure of the main components of the methane, carbon dioxide, and oxygen cycles was established, and it was observed that depthwise heterogeneities predominated in the river section. In contrast, lengthwise heterogeneities dominated in the lagoon section.
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Affiliation(s)
| | | | - Viani García-Pérez
- Department of Hydrobiology, Autonomous Metropolitan University, Av. San Rafael Atlixco 186, Mexico City 09340, Mexico
| | - Rocío Torres-Alvarado
- Department of Hydrobiology, Autonomous Metropolitan University, Av. San Rafael Atlixco 186, Mexico City 09340, Mexico
| | - Sunitha R Pangala
- Lancaster Environment Centre, Lancaster University, Bailrigg Lancaster LA1 4YQ, United Kingdom
| | - Frédéric Thalasso
- Biotechnology and Bioengineering Department, Cinvestav, Avenida IPN 2508, Mexico City 07360, Mexico.
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6
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Sauer HM, Hamilton TL, Anderson RE, Umbanhowar CE, Heathcote AJ. Diversity and distribution of sediment bacteria across an ecological and trophic gradient. PLoS One 2022; 17:e0258079. [PMID: 35312685 PMCID: PMC8936460 DOI: 10.1371/journal.pone.0258079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 03/04/2022] [Indexed: 11/18/2022] Open
Abstract
The microbial communities of lake sediments have the potential to serve as valuable bioindicators and integrators of watershed land-use and water quality; however, the relative sensitivity of these communities to physio-chemical and geographical parameters must be demonstrated at taxonomic resolutions that are feasible by current sequencing and bioinformatic approaches. The geologically diverse and lake-rich state of Minnesota (USA) is uniquely situated to address this potential because of its variability in ecological region, lake type, and watershed land-use. In this study, we selected twenty lakes with varying physio-chemical properties across four ecological regions of Minnesota. Our objectives were to (i) evaluate the diversity and composition of the bacterial community at the sediment-water interface and (ii) determine how lake location and watershed land-use impact aqueous chemistry and influence bacterial community structure. Our 16S rRNA amplicon data from lake sediment cores, at two depth intervals, data indicate that sediment communities are more likely to cluster by ecological region rather than any individual lake properties (e.g., trophic status, total phosphorous concentration, lake depth). However, composition is tied to a given lake, wherein samples from the same core were more alike than samples collected at similar depths across lakes. Our results illustrate the diversity within lake sediment microbial communities and provide insight into relationships between taxonomy, physicochemical, and geographic properties of north temperate lakes.
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Affiliation(s)
- Hailey M. Sauer
- Department of Plant and Microbial Biology, University of Minnesota, St. Paul, Minnesota, United States of America
- St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, Minnesota, United States of America
| | - Trinity L. Hamilton
- Department of Plant and Microbial Biology, University of Minnesota, St. Paul, Minnesota, United States of America
- The Biotechnology Institute, University of Minnesota, St. Paul, Minnesota, United States of America
- * E-mail:
| | - Rika E. Anderson
- Biology Department, Carleton College, Northfield, Minnesota, United States of America
| | - Charles E. Umbanhowar
- Department of Biology and Environmental Studies, St. Olaf College, Northfield, Minnesota, United States of America
| | - Adam J. Heathcote
- St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, Minnesota, United States of America
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7
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Ecosystem-Scale Oxygen Manipulations Alter Terminal Electron Acceptor Pathways in a Eutrophic Reservoir. Ecosystems 2020. [DOI: 10.1007/s10021-020-00582-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Wu K, Zhao W, Li M, Picazo F, Soininen J, Shen J, Zhu L, Cheng X, Wang J. Taxonomic dependency of beta diversity components in benthic communities of bacteria, diatoms and chironomids along a water-depth gradient. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 741:140462. [PMID: 32886961 DOI: 10.1016/j.scitotenv.2020.140462] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 06/09/2020] [Accepted: 06/21/2020] [Indexed: 06/11/2023]
Abstract
Community variation (i.e., beta diversity) along geographical gradients is a well-known ecological pattern, but the corresponding variation in beta diversity components (e.g., species turnover and nestedness) and underlying drivers remain poorly understood. Based on two alternative approaches (that is, the beta diversity partitioning proposed by Baselga and the Local Contributions to Beta Diversity (LCBD) partitioning proposed by Legendre), we examined the patterns of beta diversity components of lacustrine benthos, from bacteria to diatoms and chironomids, in the surface sediments along a 100-m water-depth gradient in Lugu Lake. We further quantified the relative importance of spatial, environmental and biotic variables in explaining water-depth patterns in beta diversity. Based on the Baselga's framework, there was a taxonomic dependency for the patterns of beta diversity components with water-depth, showing a significant species turnover pattern for bacteria, while diatoms and chironomids showed significant nestedness. This dependency was also evident in the patterns of community uniqueness with water-depth because based on Legendre's framework, the LCBD decreased with water depth for bacteria whereas increased with depth for diatoms. The total beta diversity and species turnover of bacteria could be explained by the pure effects of spatial, environmental and biotic variables. A total of 26.8% and 23.6% of the nestedness component of diatoms and chironomids was explained by environmental variables, respectively, while species turnover was mostly related to spatial variables. Bacteria total LCBD and species replacement were driven only by environmental variables. For diatoms and chironomids, however, most of the total LCBD and its two components were explained by spatial variables, and biotic variables were most important for the diatom replacement component. Our findings provide insights into the mechanisms responsible for community organizations along water-depth gradients from the perspective of beta diversity components.
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Affiliation(s)
- Kaiyuan Wu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Wenqian Zhao
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; School of Biological Sciences, Nanjing Normal University, Nanjing 210046, China
| | - Mingjia Li
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Félix Picazo
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Janne Soininen
- Department of Geosciences and Geography, University of Helsinki, PO, Box 64, Helsinki FIN-00014, Finland
| | - Ji Shen
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Lifeng Zhu
- School of Biological Sciences, Nanjing Normal University, Nanjing 210046, China
| | - Xiaoying Cheng
- School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
| | - Jianjun Wang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Le Moine Bauer S, Stensland A, Daae FL, Sandaa RA, Thorseth IH, Steen IH, Dahle H. Water Masses and Depth Structure Prokaryotic and T4-Like Viral Communities Around Hydrothermal Systems of the Nordic Seas. Front Microbiol 2018; 9:1002. [PMID: 29904373 PMCID: PMC5990851 DOI: 10.3389/fmicb.2018.01002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 04/30/2018] [Indexed: 12/04/2022] Open
Abstract
The oceanographic features of the Nordic Seas, situated between Iceland and Svalbard, have been extensively studied over the last decades. As well, the Nordic Seas hydrothermal systems situated on the Arctic Mid-Ocean Ridge System have received an increasing interest. However, there is very little knowledge on the microbial communities inhabiting the water column of the Nordic Seas, and nothing is known about the influence of the different water masses and hydrothermal plumes on the microbial community structures. In this study, we aimed at characterizing the impact of hydrothermal plumes on prokaryotic and T4-like viral communities around the island of Jan Mayen. To this end, we used 16S rRNA-gene and g23-gene profiling as well as flow cytometry counts to examine prokaryotic and viral communities in 27 samples obtained from different water masses in this area. While Thaumarchaeota and Marine group II Archaea dominated the waters deeper than 500 m, members of Flavobacteria generally dominated the shallower waters. Furthermore, extensive chemical and physical characteristics of all samples were obtained, including temperature measurements and concentrations of major ions and gases. The effect of these physiochemical variables on the communities was measured by using constrained and unconstrained multivariate analyzes, Mantel tests, network analyzes, phylogenetic analyzes, taxonomic analyzes and temperature-salinity (Θ-S) plots. Our results suggest that hydrothermal activity has little effect on pelagic microbial communities in hydrothermal plumes of the Nordic Seas. However, we provide evidences that observed differences in prokaryotic community structure can largely be attributed to which water mass each sample was taken from. In contrast, depth was the major factor structuring the T4-like viral communities. Our results also show that it is crucial to include water masses when studying the influence of hydrothermal plumes on microbial communities, as it could prevent to falsely associate a change in community structure with the presence of a plume.
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Affiliation(s)
- Sven Le Moine Bauer
- Department of Biological Sciences and K.G. Jebsen Center for Deep Sea Research, University of Bergen, Bergen, Norway
| | - Anne Stensland
- Department of Earth Science and K.G. Jebsen Center for Deep Sea Research, University of Bergen, Bergen, Norway
| | - Frida L Daae
- Department of Biological Sciences, University of Bergen, Bergen, Norway
| | - Ruth-Anne Sandaa
- Department of Biological Sciences, University of Bergen, Bergen, Norway
| | - Ingunn H Thorseth
- Department of Earth Science and K.G. Jebsen Center for Deep Sea Research, University of Bergen, Bergen, Norway
| | - Ida H Steen
- Department of Biological Sciences and K.G. Jebsen Center for Deep Sea Research, University of Bergen, Bergen, Norway
| | - Håkon Dahle
- Department of Biological Sciences and K.G. Jebsen Center for Deep Sea Research, University of Bergen, Bergen, Norway
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Randle-Boggis RJ, Ashton PD, Helgason T. Increasing flooding frequency alters soil microbial communities and functions under laboratory conditions. Microbiologyopen 2017; 7. [PMID: 29115058 PMCID: PMC5822339 DOI: 10.1002/mbo3.548] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 08/28/2017] [Accepted: 09/04/2017] [Indexed: 12/11/2022] Open
Abstract
The impacts of increased flooding frequency on soil microbial communities and potential functions, in line with predicted environmental changes, were investigated in a laboratory‐controlled environment. More frequent flooding events altered microbial community composition and significantly increased the resolved species alpha‐diversity (Shannon index). The Bacteria:Archaea ratio was greater at the end of the experiment than at the start, more‐so after only one flood. Significant changes in taxa and functional gene abundances were identified and quantified. These include genes related to the reduction and oxidation of substances associated with anoxia, for example, those involved in nitrogen and sulfur cycling. No significant changes were observed in the methanogenesis pathway, another function associated with anoxia and which contributes to the emission of greenhouse gases.
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11
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Wurzbacher C, Fuchs A, Attermeyer K, Frindte K, Grossart HP, Hupfer M, Casper P, Monaghan MT. Shifts among Eukaryota, Bacteria, and Archaea define the vertical organization of a lake sediment. MICROBIOME 2017; 5:41. [PMID: 28388930 PMCID: PMC5385010 DOI: 10.1186/s40168-017-0255-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Accepted: 03/15/2017] [Indexed: 05/10/2023]
Abstract
BACKGROUND Lake sediments harbor diverse microbial communities that cycle carbon and nutrients while being constantly colonized and potentially buried by organic matter sinking from the water column. The interaction of activity and burial remained largely unexplored in aquatic sediments. We aimed to relate taxonomic composition to sediment biogeochemical parameters, test whether community turnover with depth resulted from taxonomic replacement or from richness effects, and to provide a basic model for the vertical community structure in sediments. METHODS We analyzed four replicate sediment cores taken from 30-m depth in oligo-mesotrophic Lake Stechlin in northern Germany. Each 30-cm core spanned ca. 170 years of sediment accumulation according to 137Cs dating and was sectioned into layers 1-4 cm thick. We examined a full suite of biogeochemical parameters and used DNA metabarcoding to examine community composition of microbial Archaea, Bacteria, and Eukaryota. RESULTS Community β-diversity indicated nearly complete turnover within the uppermost 30 cm. We observed a pronounced shift from Eukaryota- and Bacteria-dominated upper layers (<5 cm) to Bacteria-dominated intermediate layers (5-14 cm) and to deep layers (>14 cm) dominated by enigmatic Archaea that typically occur in deep-sea sediments. Taxonomic replacement was the prevalent mechanism in structuring the community composition and was linked to parameters indicative of microbial activity (e.g., CO2 and CH4 concentration, bacterial protein production). Richness loss played a lesser role but was linked to conservative parameters (e.g., C, N, P) indicative of past conditions. CONCLUSIONS By including all three domains, we were able to directly link the exponential decay of eukaryotes with the active sediment microbial community. The dominance of Archaea in deeper layers confirms earlier findings from marine systems and establishes freshwater sediments as a potential low-energy environment, similar to deep sea sediments. We propose a general model of sediment structure and function based on microbial characteristics and burial processes. An upper "replacement horizon" is dominated by rapid taxonomic turnover with depth, high microbial activity, and biotic interactions. A lower "depauperate horizon" is characterized by low taxonomic richness, more stable "low-energy" conditions, and a dominance of enigmatic Archaea.
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Affiliation(s)
- Christian Wurzbacher
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, Berlin, 12587 Germany
- Berlin Center for Genomics in Biodiversity Research, Königin-Luise-Str. 6-8, Berlin, 14195 Germany
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 100, Göteborg, Sweden
| | - Andrea Fuchs
- Carl-von-Ossietzky University Oldenburg, Ammerländer Heerstraße 114-118, Oldenburg, 26129 Germany
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, Stechlin, 16775 Germany
| | - Katrin Attermeyer
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, Stechlin, 16775 Germany
- Department of Ecology and Genetics, Uppsala University, Norbyvägen 18d, Uppsala, 75236 Sweden
| | - Katharina Frindte
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, Stechlin, 16775 Germany
- Institute of Crop Science and Resource Conservation – Molecular Biology of the Rhizosphere, Nussallee 13, Bonn, 53115 Germany
| | - Hans-Peter Grossart
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, Stechlin, 16775 Germany
- Institute for Biochemistry and Biology, Potsdam University, Maulbeerallee 2, Potsdam, 14469 Germany
| | - Michael Hupfer
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, Berlin, 12587 Germany
| | - Peter Casper
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, Stechlin, 16775 Germany
| | - Michael T. Monaghan
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, Berlin, 12587 Germany
- Berlin Center for Genomics in Biodiversity Research, Königin-Luise-Str. 6-8, Berlin, 14195 Germany
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Frindte K, Allgaier M, Grossart HP, Eckert W. Redox stability regulates community structure of active microbes at the sediment-water interface. ENVIRONMENTAL MICROBIOLOGY REPORTS 2016; 8:798-804. [PMID: 27402503 DOI: 10.1111/1758-2229.12441] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 12/02/2015] [Indexed: 06/06/2023]
Abstract
Changes in redox conditions occur in a wide range of microbial habitats, in particular at the sediment-water interface (SWI) of aquatic systems. A mesocosm study using intact sediment cores from Lake Stechlin (Germany) was performed to investigate the impact of redox changes on microbial communities at the SWI. The SWI was exposed to permanent oxic (OX) or anoxic (ANOX) or to variable (VR) redox conditions, and for molecular analysis sediment samples were taken at the start and after seven days of the treatment. We performed 16S rRNA amplicon sequencing to identify redox-specific changes in the composition of metabolically active microbes. Generally, the community of active microbes in the VR cores was similar to in the OX cores, but differed significantly from the ANOX cores. Interestingly, VR conditions resulted in a high fraction of a Crenothrix-like microorganism increasing in read abundance from 4 to 5% initially, up to 69% over the experimental period. This implies that periodic redox fluctuations select for specific bacteria in environments such as seiches-affected sediments of stratified lakes. In Lake Stechlin sediment cores, these redox fluctuations lead to increased activities of specific microorganisms and high organic matter turnover rates with profound implications for aquatic organic matter cycling.
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Affiliation(s)
- Katharina Frindte
- Institute of Crop Science and Resource Conservation, Molecular Biology of the Rhizosphere, Bonn University, Nussallee 13, Bonn, 53115, Germany
| | - Martin Allgaier
- Berlin Center for Genomics in Biodiversity Research (BeGenDiv), Königin-Luise-Straße 6-8, Berlin, 14195, Germany
| | - Hans-Peter Grossart
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhuette 2, Stechlin, 16775, Germany
- Institute of Biochemistry and Biology, Potsdam University, Am Neuen Palais 10, Potsdam, 14469, Germany
| | - Werner Eckert
- The Yigal Allon Kinneret Limnological Laboratory, Israel Oceanographic and Limnological Research, Migdal, 14950, Israel
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