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Borgström A, Hansson LA, Klante C, Sjöstedt J. Wetlands as a potential multifunctioning tool to mitigate eutrophication and brownification. Ecol Appl 2024; 34:e2945. [PMID: 38286682 DOI: 10.1002/eap.2945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 09/25/2023] [Accepted: 11/16/2023] [Indexed: 01/31/2024]
Abstract
Eutrophication and brownification are ongoing environmental problems affecting aquatic ecosystems. Due to anthropogenic changes, increasing amounts of organic and inorganic compounds are entering aquatic systems from surrounding catchment areas, increasing both nutrients, total organic carbon (TOC), and water color with societal, as well as ecological consequences. Several studies have focused on the ability of wetlands to reduce nutrients, whereas data on their potential to reduce TOC and water color are scarce. Here we evaluate wetlands as a potential multifunctional tool for mitigating both eutrophication and brownification. Therefore, we performed a study for 18 months in nine wetlands allowing us to estimate the reduction in concentrations of total nitrogen (TN), total phosphorus (TP), TOC and water color. We show that wetland reduction efficiency with respect to these variables was generally higher during summer, but many of the wetlands were also efficient during winter. We also show that some, but not all, wetlands have the potential to reduce TOC, water color and nutrients simultaneously. However, the generalist wetlands that reduced all four parameters were less efficient in reducing each of them than the specialist wetlands that only reduced one or two parameters. In a broader context, generalist wetlands have the potential to function as multifunctional tools to mitigate both eutrophication and brownification of aquatic systems. However, further research is needed to assess the design of the generalist wetlands and to investigate the potential of using several specialist wetlands in the same catchment.
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Affiliation(s)
- Anna Borgström
- Department of Biology/Aquatic Ecology, Lund University, Lund, Sweden
| | - Lars-Anders Hansson
- Department of Biology/Aquatic Ecology, Lund University, Lund, Sweden
- Leibniz Institute for Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany
| | - Clemens Klante
- Department of Water Resources Engineering, Faculty of Engineering, Lund University, Lund, Sweden
- Sweden Water Research, Ideon Science Park, Lund, Sweden
| | - Johanna Sjöstedt
- Department of Biology/Aquatic Ecology, Lund University, Lund, Sweden
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2
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Hagström Å, Zweifel UL, Sundh J, Osbeck CMG, Bunse C, Sjöstedt J, Müller-Karulis B, Pinhassi J. Composition and Seasonality of Membrane Transporters in Marine Picoplankton. Front Microbiol 2021; 12:714732. [PMID: 34650527 PMCID: PMC8507841 DOI: 10.3389/fmicb.2021.714732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 08/24/2021] [Indexed: 11/13/2022] Open
Abstract
In this study, we examined transporter genes in metagenomic and metatranscriptomic data from a time-series survey in the temperate marine environment of the Baltic Sea. We analyzed the abundance and taxonomic distribution of transporters in the 3μm–0.2μm size fraction comprising prokaryotes and some picoeukaryotes. The presence of specific transporter traits was shown to be guiding the succession of these microorganisms. A limited number of taxa were associated with the dominant transporter proteins that were identified for the nine key substrate categories for microbial growth. Throughout the year, the microbial taxa at the level of order showed highly similar patterns in terms of transporter traits. The distribution of transporters stayed the same, irrespective of the abundance of each taxon. This would suggest that the distribution pattern of transporters depends on the bacterial groups being dominant at a given time of the year. Also, we find notable numbers of secretion proteins that may allow marine bacteria to infect and kill prey organisms thus releasing nutrients. Finally, we demonstrate that transporter proteins may provide clues to the relative importance of biogeochemical processes, and we suggest that virtual transporter functionalities may become important components in future population dynamics models.
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Affiliation(s)
- Åke Hagström
- Centre for Ecology and Evolution in Microbial Model Systems - EEMiS, Linnaeus University, Kalmar, Sweden
| | - Ulla Li Zweifel
- Swedish Institute for the Marine Environment, Gothenburg University, Gothenburg, Sweden
| | - John Sundh
- Department of Biochemistry and Biophysics, National Bioinformatics Infrastructure Sweden, Science for Life Laboratory, Stockholm University, Solna, Sweden
| | - Christofer M G Osbeck
- Centre for Ecology and Evolution in Microbial Model Systems - EEMiS, Linnaeus University, Kalmar, Sweden
| | - Carina Bunse
- Centre for Ecology and Evolution in Microbial Model Systems - EEMiS, Linnaeus University, Kalmar, Sweden.,Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg (HIFMB), Oldenburg, Germany
| | - Johanna Sjöstedt
- Centre for Ecology and Evolution in Microbial Model Systems - EEMiS, Linnaeus University, Kalmar, Sweden.,Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | | | - Jarone Pinhassi
- Centre for Ecology and Evolution in Microbial Model Systems - EEMiS, Linnaeus University, Kalmar, Sweden
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3
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Sjöstedt J, Lapierre JF, Yamashita Y, Baltar F. Editorial: Microbial Utilization and Transformation of Dissolved Organic Matter in Aquatic Environments-From Streams to the Deep Ocean. Front Microbiol 2021; 12:668560. [PMID: 34054777 PMCID: PMC8155277 DOI: 10.3389/fmicb.2021.668560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 04/06/2021] [Indexed: 11/13/2022] Open
Affiliation(s)
- Johanna Sjöstedt
- Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden
| | | | - Youhei Yamashita
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan
| | - Federico Baltar
- Department of Functional and Evolutionary Ecology, University of Vienna, Vienna, Austria
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4
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Renes SE, Sjöstedt J, Fetzer I, Langenheder S. Disturbance history can increase functional stability in the face of both repeated disturbances of the same type and novel disturbances. Sci Rep 2020; 10:11333. [PMID: 32647292 PMCID: PMC7347917 DOI: 10.1038/s41598-020-68104-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 06/18/2020] [Indexed: 02/08/2023] Open
Abstract
Climate change is expected to increase the incidences of extremes in environmental conditions. To investigate how repeated disturbances affect microbial ecosystem resistance, natural lake bacterioplankton communities were subjected to repeated temperature disturbances of two intensities (25 °C and 35 °C), and subsequently to an acidification event. We measured functional parameters (bacterial production, abundance, extracellular enzyme activities) and community composition parameters (richness, evenness, niche width) and found that, compared to undisturbed control communities, the 35 °C treatment was strongly affected in all parameters, while the 25 °C treatment did not significantly differ from the control. Interestingly, exposure to multiple temperature disturbances caused gradually increasing stability in the 35 °C treatment in some parameters, while others parameters showed the opposite, indicating that the choice of parameters can strongly affect the outcome of a study. The acidification event did not lead to stronger changes in community structure, but functional resistance of bacterial production towards acidification in the 35 °C treatments increased. This indicates that functional resistance in response to a novel disturbance can be increased by previous exposure to another disturbance, suggesting similarity in stress tolerance mechanisms for both disturbances. These results highlight the need for understanding function- and disturbance-specific responses, since general responses are likely to be unpredictable.
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Affiliation(s)
- Sophia Elise Renes
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden. .,Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, Sweden.
| | - Johanna Sjöstedt
- Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, Sweden. .,Department of Biology/Aquatic Ecology, Lund University, Lund, Sweden.
| | - Ingo Fetzer
- Stockholm Resilience Centre, Stockholm University, Stockholm, Sweden.,Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
| | - Silke Langenheder
- Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, Sweden
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Sjöstedt J, Langenheder S, Kritzberg E, Karlsson CMG, Lindström ES. Repeated disturbances affect functional but not compositional resistance and resilience in an aquatic bacterioplankton community. Environ Microbiol Rep 2018; 10:493-500. [PMID: 29733107 DOI: 10.1111/1758-2229.12656] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 01/11/2016] [Indexed: 05/25/2023]
Abstract
Disturbances are believed to be one of the main factors influencing variations in community diversity and functioning. Here we investigated if exposure to a pH press disturbance affected the composition and functional performance of a bacterial community and its resistance, recovery and resilience to a second press disturbance (salt addition). Lake bacterial assemblages were initially exposed to reduced pH in six mesocosms whereas another six mesocosms were kept as reference. Seven days after the pH disturbance, three tanks from each treatment were exposed to a salt disturbance. Both bacterial production and enzyme activity were negatively affected by the salt treatment, regardless if the communities had been subject to a previous disturbance or not. However, cell-specific enzyme activity had a higher resistance in communities pre-exposed to the pH disturbance compared to the reference treatment. In contrast, for cell-specific bacterial production resistance was not affected, but recovery was faster in the communities that had previously been exposed to the pH disturbance. Over time, bacterial community composition diverged among treatments, in response to both pH and salinity. The difference in functional recovery, resilience and resistance may depend on differences in community composition caused by the pH disturbance, niche breadth or acquired stress resistance.
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Affiliation(s)
- Johanna Sjöstedt
- Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, SE 75236, Sweden
- Department of Biology/Aquatic Ecology, Lund University, Lund, Sölvegatan 37, SE 22362, Sweden
| | - Silke Langenheder
- Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, SE 75236, Sweden
| | - Emma Kritzberg
- Department of Biology/Aquatic Ecology, Lund University, Lund, Sölvegatan 37, SE 22362, Sweden
| | - Christofer M G Karlsson
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE 39231, Sweden
| | - Eva S Lindström
- Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, SE 75236, Sweden
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Holmberg E, Sjöstedt J, Malinina E, Johansson M, Turkmen S, Ragagnin G, Lundqvist A, Löfgren M, Jaukkuri L, Bixo M, Bäckström T. Allopregnanolone involvement in feeding regulation, overeating and obesity. Front Neuroendocrinol 2018; 48:70-77. [PMID: 28694181 DOI: 10.1016/j.yfrne.2017.07.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 07/04/2017] [Accepted: 07/05/2017] [Indexed: 01/19/2023]
Abstract
Obesity is strongly associated with ill health, primarily caused by consumption of excessive calories, and promoted (inter alia) by gamma-amino-butyric-acid (GABA) stimulating food intake by activating GABAA receptors (primarily with α3 and α2 subunits) in the hypothalamic arcuate nucleus and paraventricular nucleus. Allopregnanolone is a potent positive GABAA receptor modulating steroid (GAMS). As reviewed here, elevated allopregnanolone levels are associated with increases in food intake, preferences for energy-rich food, and obesity in humans and other mammals. In women with polycystic ovarian disease, high serum allopregnanolone concentrations are linked to uncontrolled eating, and perturbed sensitivity to allopregnanolone. Increases in weight during pregnancy also correlate with increases in allopregnanolone levels. Moreover, Prader-Willis syndrome is associated with massive overeating, absence of a GABAA receptor (with compensatory >12-, >5- and >1.5-fold increases in α4, γ2, and α1, α3 subunits), and increases in the α4, βx, δ receptor subtype, which is highly sensitive to allopregnanolone. GABA and positive GABA-A receptor modulating steroids like allopregnanolone stimulates food intake and weight gain.
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Affiliation(s)
- E Holmberg
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden
| | - J Sjöstedt
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden
| | - E Malinina
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden
| | - M Johansson
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden
| | - S Turkmen
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden
| | - G Ragagnin
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden
| | - A Lundqvist
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden
| | - M Löfgren
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden
| | - L Jaukkuri
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden
| | - M Bixo
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden
| | - T Bäckström
- Umeå Neurosteroid Research Center, Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, SE-901 85 Umeå, Sweden.
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Broman E, Sjöstedt J, Pinhassi J, Dopson M. Shifts in coastal sediment oxygenation cause pronounced changes in microbial community composition and associated metabolism. Microbiome 2017; 5:96. [PMID: 28793929 PMCID: PMC5549381 DOI: 10.1186/s40168-017-0311-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 07/18/2017] [Indexed: 05/25/2023]
Abstract
BACKGROUND A key characteristic of eutrophication in coastal seas is the expansion of hypoxic bottom waters, often referred to as 'dead zones'. One proposed remediation strategy for coastal dead zones in the Baltic Sea is to mix the water column using pump stations, circulating oxygenated water to the sea bottom. Although microbial metabolism in the sediment surface is recognized as key in regulating bulk chemical fluxes, it remains unknown how the microbial community and its metabolic processes are influenced by shifts in oxygen availability. Here, coastal Baltic Sea sediments sampled from oxic and anoxic sites, plus an intermediate area subjected to episodic oxygenation, were experimentally exposed to oxygen shifts. Chemical, 16S rRNA gene, metagenomic, and metatranscriptomic analyses were conducted to investigate changes in chemistry fluxes, microbial community structure, and metabolic functions in the sediment surface. RESULTS Compared to anoxic controls, oxygenation of anoxic sediment resulted in a proliferation of bacterial populations in the facultative anaerobic genus Sulfurovum that are capable of oxidizing toxic sulfide. Furthermore, the oxygenated sediment had higher amounts of RNA transcripts annotated as sqr, fccB, and dsrA involved in sulfide oxidation. In addition, the importance of cryptic sulfur cycling was highlighted by the oxidative genes listed above as well as dsvA, ttrB, dmsA, and ddhAB that encode reductive processes being identified in anoxic and intermediate sediments turned oxic. In particular, the intermediate site sediments responded differently upon oxygenation compared to the anoxic and oxic site sediments. This included a microbial community composition with more habitat generalists, lower amounts of RNA transcripts attributed to methane oxidation, and a reduced rate of organic matter degradation. CONCLUSIONS These novel data emphasize that genetic expression analyses has the power to identify key molecular mechanisms that regulate microbial community responses upon oxygenation of dead zones. Moreover, these results highlight that microbial responses, and therefore ultimately remediation efforts, depend largely on the oxygenation history of sites. Furthermore, it was shown that re-oxygenation efforts to remediate dead zones could ultimately be facilitated by in situ microbial molecular mechanisms involved in removal of toxic H2S and the potent greenhouse gas methane.
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Affiliation(s)
- Elias Broman
- Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden
| | - Johanna Sjöstedt
- Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden
- Present address: Department of Biology/Aquatic ecology, Lund University, Sölvesgatan 37, 223 62 Lund, Sweden
- Present address: Centre for Ocean Life, Institute for Aquatic Resources, Technical University of Denmark, 2900 Charlottenlund, Denmark
| | - Jarone Pinhassi
- Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden
| | - Mark Dopson
- Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden
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Lindh MV, Sjöstedt J, Ekstam B, Casini M, Lundin D, Hugerth LW, Hu YOO, Andersson AF, Andersson A, Legrand C, Pinhassi J. Metapopulation theory identifies biogeographical patterns among core and satellite marine bacteria scaling from tens to thousands of kilometers. Environ Microbiol 2017; 19:1222-1236. [PMID: 28028880 DOI: 10.1111/1462-2920.13650] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 12/10/2016] [Accepted: 12/18/2016] [Indexed: 12/11/2022]
Abstract
Metapopulation theory developed in terrestrial ecology provides applicable frameworks for interpreting the role of local and regional processes in shaping species distribution patterns. Yet, empirical testing of metapopulation models on microbial communities is essentially lacking. We determined regional bacterioplankton dynamics from monthly transect sampling in the Baltic Sea Proper using 16S rRNA gene sequencing. A strong positive trend was found between local relative abundance and occupancy of populations. Notably, the occupancy-frequency distributions were significantly bimodal with a satellite mode of rare endemic populations and a core mode of abundant cosmopolitan populations (e.g. Synechococcus, SAR11 and SAR86 clade members). Temporal changes in population distributions supported several theoretical frameworks. Still, bimodality was found among bacterioplankton communities across the entire Baltic Sea, and was also frequent in globally distributed datasets. Datasets spanning waters with widely different physicochemical characteristics or environmental gradients typically lacked significant bimodal patterns. When such datasets were divided into subsets with coherent environmental conditions, bimodal patterns emerged, highlighting the importance of positive feedbacks between local abundance and occupancy within specific biomes. Thus, metapopulation theory applied to microbial biogeography can provide novel insights into the mechanisms governing shifts in biodiversity resulting from natural or anthropogenically induced changes in the environment.
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Affiliation(s)
- Markus V Lindh
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
| | - Johanna Sjöstedt
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
| | - Börje Ekstam
- Department of Biology and Environmental Science, Linnaeus University, Kalmar, SE-39182, Sweden
| | - Michele Casini
- Department of Aquatic Resources, Institute of Marine Research, Swedish University of Agricultural Sciences, Lysekil, SE-45330, Sweden
| | - Daniel Lundin
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
| | - Luisa W Hugerth
- Science for Life Laboratory School of Biotechnology, KTH Royal Institute of Technology, Stockholm, SE-10691, Sweden
| | - Yue O O Hu
- Science for Life Laboratory School of Biotechnology, KTH Royal Institute of Technology, Stockholm, SE-10691, Sweden
| | - Anders F Andersson
- Science for Life Laboratory School of Biotechnology, KTH Royal Institute of Technology, Stockholm, SE-10691, Sweden
| | - Agneta Andersson
- Department of Ecology and Environmental Science, Umeå University, Umeå, SE-90187, Sweden
| | - Catherine Legrand
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
| | - Jarone Pinhassi
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
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Lindh MV, Sjöstedt J, Casini M, Andersson A, Legrand C, Pinhassi J. Local Environmental Conditions Shape Generalist But Not Specialist Components of Microbial Metacommunities in the Baltic Sea. Front Microbiol 2016; 7:2078. [PMID: 28066392 PMCID: PMC5180196 DOI: 10.3389/fmicb.2016.02078] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 12/08/2016] [Indexed: 01/06/2023] Open
Abstract
Marine microbes exhibit biogeographical patterns linked with fluxes of matter and energy. Yet, knowledge of the mechanisms shaping bacterioplankton community assembly across temporal scales remains poor. We examined bacterioplankton 16S rRNA gene fragments obtained from Baltic Sea transects to determine phylogenetic relatedness and assembly processes coupled with niche breadth. Communities were phylogenetically more related over time than expected by chance, albeit with considerable temporal variation. Hence, habitat filtering, i.e., local environmental conditions, rather than competition structured bacterioplankton communities in summer but not in spring or autumn. Species sorting (SS) was the dominant assembly process, but temporal and taxonomical variation in mechanisms was observed. For May communities, Cyanobacteria, Actinobacteria, Alpha- and Betaproteobacteria exhibited SS while Bacteroidetes and Verrucomicrobia were assembled by SS and mass effect. Concomitantly, Gammaproteobacteria were assembled by the neutral model and patch dynamics. Temporal variation in habitat filtering and dispersal highlights the impact of seasonally driven reorganization of microbial communities. Typically abundant Baltic Sea populations such as the NS3a marine group (Bacteroidetes) and the SAR86 and SAR11 clade had the highest niche breadth. The verrucomicrobial Spartobacteria population also exhibited high niche breadth. Surprisingly, variation in bacterioplankton community composition was regulated by environmental factors for generalist taxa but not specialists. Our results suggest that generalists such as NS3a, SAR86, and SAR11 are reorganized to a greater extent by changes in the environment compared to specialists and contribute more strongly to determining overall biogeographical patterns of marine bacterial communities.
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Affiliation(s)
- Markus V Lindh
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University Kalmar, Sweden
| | - Johanna Sjöstedt
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University Kalmar, Sweden
| | - Michele Casini
- Department of Aquatic Resources, Institute of Marine Research, Swedish University of Agricultural Sciences (SLU) Lysekil, Sweden
| | - Agneta Andersson
- Department of Ecology and Environmental Science, Umeå University Umeå, Sweden
| | - Catherine Legrand
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University Kalmar, Sweden
| | - Jarone Pinhassi
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University Kalmar, Sweden
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Lindh MV, Figueroa D, Sjöstedt J, Baltar F, Lundin D, Andersson A, Legrand C, Pinhassi J. Transplant experiments uncover Baltic Sea basin-specific responses in bacterioplankton community composition and metabolic activities. Front Microbiol 2015; 6:223. [PMID: 25883589 PMCID: PMC4381636 DOI: 10.3389/fmicb.2015.00223] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 03/05/2015] [Indexed: 11/21/2022] Open
Abstract
Anthropogenically induced changes in precipitation are projected to generate increased river runoff to semi-enclosed seas, increasing loads of terrestrial dissolved organic matter and decreasing salinity. To determine how bacterial community structure and functioning adjust to such changes, we designed microcosm transplant experiments with Baltic Proper (salinity 7.2) and Bothnian Sea (salinity 3.6) water. Baltic Proper bacteria generally reached higher abundances than Bothnian Sea bacteria in both Baltic Proper and Bothnian Sea water, indicating higher adaptability. Moreover, Baltic Proper bacteria growing in Bothnian Sea water consistently showed highest bacterial production and beta-glucosidase activity. These metabolic responses were accompanied by basin-specific changes in bacterial community structure. For example, Baltic Proper Pseudomonas and Limnobacter populations increased markedly in relative abundance in Bothnian Sea water, indicating a replacement effect. In contrast, Roseobacter and Rheinheimera populations were stable or increased in abundance when challenged by either of the waters, indicating an adjustment effect. Transplants to Bothnian Sea water triggered the initial emergence of particular Burkholderiaceae populations, and transplants to Baltic Proper water triggered Alteromonadaceae populations. Notably, in the subsequent re-transplant experiment, a priming effect resulted in further increases to dominance of these populations. Correlated changes in community composition and metabolic activity were observed only in the transplant experiment and only at relatively high phylogenetic resolution. This suggested an importance of successional progression for interpreting relationships between bacterial community composition and functioning. We infer that priming effects on bacterial community structure by natural episodic events or climate change induced forcing could translate into long-term changes in bacterial ecosystem process rates.
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Affiliation(s)
- Markus V Lindh
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar Sweden
| | - Daniela Figueroa
- Department of Ecology and Environmental Science, Umeå University, Umeå Sweden ; Umeå Marine Sciences Centre, Umeå University, Umeå Sweden
| | - Johanna Sjöstedt
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar Sweden
| | - Federico Baltar
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar Sweden ; Department of Marine Science, University of Otago, Dunedin New Zealand
| | - Daniel Lundin
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar Sweden
| | - Agneta Andersson
- Department of Ecology and Environmental Science, Umeå University, Umeå Sweden ; Umeå Marine Sciences Centre, Umeå University, Umeå Sweden
| | - Catherine Legrand
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar Sweden
| | - Jarone Pinhassi
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar Sweden
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Lindh MV, Sjöstedt J, Andersson AF, Baltar F, Hugerth LW, Lundin D, Muthusamy S, Legrand C, Pinhassi J. Disentangling seasonal bacterioplankton population dynamics by high-frequency sampling. Environ Microbiol 2015; 17:2459-76. [PMID: 25403576 DOI: 10.1111/1462-2920.12720] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 11/11/2014] [Accepted: 11/11/2014] [Indexed: 01/08/2023]
Abstract
Multiyear comparisons of bacterioplankton succession reveal that environmental conditions drive community shifts with repeatable patterns between years. However, corresponding insight into bacterioplankton dynamics at a temporal resolution relevant for detailed examination of variation and characteristics of specific populations within years is essentially lacking. During 1 year, we collected 46 samples in the Baltic Sea for assessing bacterial community composition by 16S rRNA gene pyrosequencing (nearly twice weekly during productive season). Beta-diversity analysis showed distinct clustering of samples, attributable to seemingly synchronous temporal transitions among populations (populations defined by 97% 16S rRNA gene sequence identity). A wide spectrum of bacterioplankton dynamics was evident, where divergent temporal patterns resulted both from pronounced differences in relative abundance and presence/absence of populations. Rates of change in relative abundance calculated for individual populations ranged from 0.23 to 1.79 day(-1) . Populations that were persistently dominant, transiently abundant or generally rare were found in several major bacterial groups, implying evolution has favoured a similar variety of life strategies within these groups. These findings suggest that high temporal resolution sampling allows constraining the timescales and frequencies at which distinct populations transition between being abundant or rare, thus potentially providing clues about physical, chemical or biological forcing on bacterioplankton community structure.
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Affiliation(s)
- Markus V Lindh
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
| | - Johanna Sjöstedt
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
| | - Anders F Andersson
- Science for Life Laboratory, KTH Royal Institute of Technology, School of Biotechnology, Stockholm, SE-10691, Sweden
| | - Federico Baltar
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden.,Department of Marine Sciences, University of Otago, PO Box 56, Dunedin, NZ-9054, New Zealand
| | - Luisa W Hugerth
- Science for Life Laboratory, KTH Royal Institute of Technology, School of Biotechnology, Stockholm, SE-10691, Sweden
| | - Daniel Lundin
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
| | - Saraladevi Muthusamy
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
| | - Catherine Legrand
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
| | - Jarone Pinhassi
- Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar, SE-39182, Sweden
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