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Brooks CN, Field EK. Microbial community response to hydrocarbon exposure in iron oxide mats: an environmental study. Front Microbiol 2024; 15:1388973. [PMID: 38800754 PMCID: PMC11116660 DOI: 10.3389/fmicb.2024.1388973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Accepted: 04/16/2024] [Indexed: 05/29/2024] Open
Abstract
Hydrocarbon pollution is a widespread issue in both groundwater and surface-water systems; however, research on remediation at the interface of these two systems is limited. This interface is the oxic-anoxic boundary, where hydrocarbon pollutant from contaminated groundwaters flows into surface waters and iron mats are formed by microaerophilic iron-oxidizing bacteria. Iron mats are highly chemically adsorptive and host a diverse community of microbes. To elucidate the effect of hydrocarbon exposure on iron mat geochemistry and microbial community structure and function, we sampled iron mats both upstream and downstream from a leaking underground storage tank. Hydrocarbon-exposed iron mats had significantly higher concentrations of oxidized iron and significantly lower dissolved organic carbon and total dissolved phosphate than unexposed iron mats. A strong negative correlation between dissolved phosphate and benzene was observed in the hydrocarbon-exposed iron mats and water samples. There were positive correlations between iron and other hydrocarbons with benzene in the hydrocarbon-exposed iron mats, which was unique from water samples. The hydrocarbon-exposed iron mats represented two types, flocculent and seep, which had significantly different concentrations of iron, hydrocarbons, and phosphate, indicating that iron mat is also an important context in studies of freshwater mats. Using constrained ordination, we found the best predictors for community structure to be dissolved oxygen, pH, and benzene. Alpha diversity and evenness were significantly lower in hydrocarbon-exposed iron mats than unexposed mats. Using 16S rDNA amplicon sequences, we found evidence of three putative nitrate-reducing iron-oxidizing taxa in microaerophile-dominated iron mats (Azospira, Paracoccus, and Thermomonas). 16S rDNA amplicons also indicated the presence of taxa that are associated with hydrocarbon degradation. Benzene remediation-associated genes were found using metagenomic analysis both in exposed and unexposed iron mats. Furthermore, the results indicated that season (summer vs. spring) exacerbates the negative effect of hydrocarbon exposure on community diversity and evenness and led to the increased abundance of numerous OTUs. This study represents the first of its kind to attempt to understand how contaminant exposure, specifically hydrocarbons, influences the geochemistry and microbial community of freshwater iron mats and further develops our understanding of hydrocarbon remediation at the land-water interface.
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Affiliation(s)
- Chequita N. Brooks
- Department of Biology, East Carolina University, Greenville, NC, United States
- Louisiana Universities Marine Consortium, Chauvin, LA, United States
| | - Erin K. Field
- Department of Biology, East Carolina University, Greenville, NC, United States
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Lumian J, Sumner DY, Grettenberger CL, Jungblut AD, Irber L, Pierce-Ward NT, Brown CT. Biogeographic distribution of five Antarctic cyanobacteria using large-scale k-mer searching with sourmash branchwater. Front Microbiol 2024; 15:1328083. [PMID: 38440141 PMCID: PMC10909832 DOI: 10.3389/fmicb.2024.1328083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 02/06/2024] [Indexed: 03/06/2024] Open
Abstract
Cyanobacteria form diverse communities and are important primary producers in Antarctic freshwater environments, but their geographic distribution patterns in Antarctica and globally are still unresolved. There are however few genomes of cultured cyanobacteria from Antarctica available and therefore metagenome-assembled genomes (MAGs) from Antarctic cyanobacteria microbial mats provide an opportunity to explore distribution of uncultured taxa. These MAGs also allow comparison with metagenomes of cyanobacteria enriched communities from a range of habitats, geographic locations, and climates. However, most MAGs do not contain 16S rRNA gene sequences, making a 16S rRNA gene-based biogeography comparison difficult. An alternative technique is to use large-scale k-mer searching to find genomes of interest in public metagenomes. This paper presents the results of k-mer based searches for 5 Antarctic cyanobacteria MAGs from Lake Fryxell and Lake Vanda, assigned the names Phormidium pseudopriestleyi FRX01, Microcoleus sp. MP8IB2.171, Leptolyngbya sp. BulkMat.35, Pseudanabaenaceae cyanobacterium MP8IB2.15, and Leptolyngbyaceae cyanobacterium MP9P1.79 in 498,942 unassembled metagenomes from the National Center for Biotechnology Information (NCBI) Sequence Read Archive (SRA). The Microcoleus sp. MP8IB2.171 MAG was found in a wide variety of environments, the P. pseudopriestleyi MAG was found in environments with challenging conditions, the Leptolyngbyaceae cyanobacterium MP9P1.79 MAG was only found in Antarctica, and the Leptolyngbya sp. BulkMat.35 and Pseudanabaenaceae cyanobacterium MP8IB2.15 MAGs were found in Antarctic and other cold environments. The findings based on metagenome matches and global comparisons suggest that these Antarctic cyanobacteria have distinct distribution patterns ranging from locally restricted to global distribution across the cold biosphere and other climatic zones.
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Affiliation(s)
- Jessica Lumian
- Department of Earth and Planetary Sciences, Microbiology Graduate Group, University of California Davis, Davis, CA, United States
| | - Dawn Y. Sumner
- Department of Earth and Planetary Sciences, University of California Davis, Davis, CA, United States
| | - Christen L. Grettenberger
- Department of Earth and Planetary Sciences, University of California Davis, Davis, CA, United States
- Department of Environmental Toxicology, University of California Davis, Davis, CA, United States
| | - Anne D. Jungblut
- Department of Science, The Natural History Museum, London, United Kingdom
| | - Luiz Irber
- Population Health and Reproduction, University of California Davis, Davis, CA, United States
| | - N. Tessa Pierce-Ward
- Population Health and Reproduction, University of California Davis, Davis, CA, United States
| | - C. Titus Brown
- Population Health and Reproduction, University of California Davis, Davis, CA, United States
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Vigneron A, Guyoneaud R, Goñi-Urriza M. Genome-Centric Metatranscriptomics Reveals Multiple Co-occurring Routes for Hydrocarbon Degradation in Chronically Contaminated Marine Microbial Mats. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:1551-1562. [PMID: 38197744 DOI: 10.1021/acs.est.3c08386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
Long-term hydrocarbon pollution is a devious threat to aquatic and marine ecosystems. However, microbial responses to chronic pollution remain poorly understood. Combining genome-centric metagenomic and metatranscriptomic analyses of microbial mat samples that experienced chronic hydrocarbon pollution for more than 80 years, we analyzed the transcriptomic activity of alkane and aromatic hydrocarbon degradation pathways at the population level. Consistent with the fluctuating and stratified redox conditions of the habitat, both aerobic and anaerobic hydrocarbon degradation pathways were expressed by taxonomically and metabolically contrasted lineages including members of Bacteroidiales, Desulfobacteraceae, Pseudomonadales; Alcanivoraceae and Halieaceae populations with (photo)-heterotrophic, sulfur- and organohalide-based metabolisms, providing evidence for the co-occurrence and activity of aerobic and anaerobic hydrocarbon degradation pathways in shallow marine microbial mats. In addition, our results suggest that aerobic alkane degradation in long-term pollution involved bacterial families that are naturally widely distributed in marine habitats, but hydrocarbon concentration and composition were found to be a strong structuring factor of their intrafamily diversity and transcriptomic activities.
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Affiliation(s)
- Adrien Vigneron
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau 64053, France
| | - Rémy Guyoneaud
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau 64053, France
| | - Marisol Goñi-Urriza
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau 64053, France
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Vigneron A, Cruaud P, Guyoneaud R, Goñi-Urriza M. Into the darkness of the microbial dark matter in situ activities through expression profiles of Patescibacteria populations. Front Microbiol 2023; 13:1073483. [PMID: 36699594 PMCID: PMC9868632 DOI: 10.3389/fmicb.2022.1073483] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 12/05/2022] [Indexed: 01/11/2023] Open
Abstract
Patescibacteria form a highly diverse and widespread superphylum of uncultured microorganisms representing a third of the global microbial diversity. Most of our knowledge on Patescibacteria putative physiology relies on metagenomic mining and metagenome-assembled genomes, but the in situ activities and the ecophysiology of these microorganisms have been rarely explored, leaving the role of Patescibacteria in ecosystems elusive. Using a genome-centric metatranscriptomic approach, we analyzed the diel and seasonal gene transcription profiles of 18 Patescibacteria populations in brackish microbial mats to test whether our understanding of Patescibacteria metabolism allows the extrapolation of their in situ activities. Although our results revealed a circadian cycle in Patescibacteria activities, a strong streamlined genetic expression characterized the Patescibacteria populations. This result has a major consequence for the extrapolation of their physiology and environmental function since most transcribed genes were uncharacterized, indicating that the ecophysiology of Patescibacteria cannot be yet reliably predicted from genomic data.
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Affiliation(s)
- Adrien Vigneron
- IBEAS, Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France
| | | | - Rémy Guyoneaud
- IBEAS, Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France
| | - Marisol Goñi-Urriza
- IBEAS, Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France
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Maltseva AL, Lobov AA, Pavlova PA, Panova M, Gafarova ER, Marques JP, Danilov LG, Granovitch AI. Orphan gene in Littorina: An unexpected role of symbionts in the host evolution. Gene 2022; 824:146389. [PMID: 35257790 DOI: 10.1016/j.gene.2022.146389] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 01/29/2022] [Accepted: 02/28/2022] [Indexed: 11/16/2022]
Abstract
Mechanisms of reproductive isolation between closely related sympatric species are of high evolutionary significance as they may function as initial drivers of speciation and protect species integrity afterwards. Proteins involved in the establishment of reproductive barriers often evolve fast and may be key players in cessation of gene flow between the incipient species. The five Atlantic Littorina (Neritrema) species represent a notable example of recent radiation. The geographic ranges of these young species largely overlap and the mechanisms of reproductive isolation are poorly understood. In this study, we performed a detailed analysis of the reproductive protein LOSP, previously identified in Littorina. We showed that this protein is evolutionary young and taxonomically restricted to the genus Littorina. It has high sequence variation both within and between Littorina species, which is compatible with its presumable role in the reproductive isolation. The strongest differences in the LOSP structure were detected between Littorina subgenera with distinctive repetitive motifs present exclusively in the Neritrema species, but not in L. littorea. Moreover, the sequence of these repetitive structural elements demonstrates a high homology with genetic elements of bacteria, identified as components of Littorina associated microbiomes. We suggest that these elements were acquired from a symbiotic bacterial donor via horizontal genetic transfer (HGT), which is indirectly confirmed by the presence of multiple transposable elements in the LOSP flanking and intronic regions. Furthermore, we hypothesize that this HGT-driven evolutionary innovation promoted LOSP function in reproductive isolation, which might be one of the factors determining the intensive cladogenesis in the Littorina (Neritrema) lineage in contrast to the anagenesis in the L. littorea clade.
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Affiliation(s)
- A L Maltseva
- Department of Invertebrate Zoology, St Petersburg State University, St Petersburg, Russia.
| | - A A Lobov
- Department of Invertebrate Zoology, St Petersburg State University, St Petersburg, Russia; Laboratory of Regenerative Biomedicine, Institute of Cytology Russian Academy of Sciences, St Petersburg, Russia
| | - P A Pavlova
- Department of Invertebrate Zoology, St Petersburg State University, St Petersburg, Russia
| | - M Panova
- Department of Invertebrate Zoology, St Petersburg State University, St Petersburg, Russia; Department of Marine Sciences - Tjärnö, University of Gothenburg, Sweden
| | - E R Gafarova
- Department of Invertebrate Zoology, St Petersburg State University, St Petersburg, Russia
| | - J P Marques
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Universidade do Porto, Vairão, Portugal; Departamento de Biologia, Faculdade de Ciências do Porto, 4169-007 Porto, Portugal; ISEM, Univ Montpellier, CNRS, EPHE, IRD, 34095 Montpellier, France
| | - L G Danilov
- Department of Genetics and Biotechnology, St. Petersburg State University, St. Petersburg, Russia
| | - A I Granovitch
- Department of Invertebrate Zoology, St Petersburg State University, St Petersburg, Russia
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Transcriptomic evidence for versatile metabolic activities of mercury cycling microorganisms in brackish microbial mats. NPJ Biofilms Microbiomes 2021; 7:83. [PMID: 34799579 PMCID: PMC8605020 DOI: 10.1038/s41522-021-00255-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 10/22/2021] [Indexed: 01/29/2023] Open
Abstract
Methylmercury, biomagnifying through food chains, is highly toxic for aquatic life. Its production and degradation are largely driven by microbial transformations; however, diversity and metabolic activity of mercury transformers, resulting in methylmercury concentrations in environments, remain poorly understood. Microbial mats are thick biofilms where oxic and anoxic metabolisms cooccur, providing opportunities to investigate the complexity of the microbial mercury transformations over contrasted redox conditions. Here, we conducted a genome-resolved metagenomic and metatranscriptomic analysis to identify putative activity of mercury reducers, methylators and demethylators in microbial mats strongly contaminated by mercury. Our transcriptomic results revealed the major role of rare microorganisms in mercury cycling. Mercury methylators, mainly related to Desulfobacterota, expressed a large panel of metabolic activities in sulfur, iron, nitrogen, and halogen compound transformations, extending known activities of mercury methylators under suboxic to anoxic conditions. Methylmercury detoxification processes were dissociated in the microbial mats with methylmercury cleavage being carried out by sulfide-oxidizing Thiotrichaceae and Rhodobacteraceae populations, whereas mercury reducers included members of the Verrucomicrobia, Bacteroidetes, Gammaproteobacteria, and different populations of Rhodobacteraceae. However most of the mercury reduction was potentially carried out anaerobically by sulfur- and iron-reducing Desulfuromonadaceae, revising our understanding of mercury transformers ecophysiology.
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Unravelling Microbial Communities Associated with Different Light Non-Aqueous Phase Liquid Types Undergoing Natural Source Zone Depletion Processes at a Legacy Petroleum Site. WATER 2021. [DOI: 10.3390/w13070898] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Petroleum contaminants are exposed to weathering when released into environment, resulting in the alteration of their chemical composition. Here, we investigated microbial communities through the soil profile at an industrial site, which was exposed to various petroleum products for over 50 years. The petroleum is present as light non-aqueous phase liquid (LNAPL) and is undergoing natural source zone depletion (NSZD). Microbial community composition was compared to the contaminant type, concentration, and its depth of obtained soil cores. A large population of Archaea, particularly Methanomicrobia and Methanobacteria and indication of complex syntrophic relationships of methanogens, methanotrophs and bacteria were found in the contaminated cores. Different families were enriched across the LNAPL types. Results indicate methanogenic or anoxic conditions in the deeper and highly contaminated sections of the soil cores investigated. The contaminant was highly weathered, likely resulting in the formation of recalcitrant polar compounds. This research provides insight into the microorganisms fundamentally associated with LNAPL, throughout a soil depth profile above and below the water table, undergoing NSZD processes at a legacy petroleum site. It advances the potential for integration of microbial community effects on bioremediation and in response to physicochemical partitioning of LNAPL components from different petroleum types.
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Zdarta A, Smułek W, Kaczorek E. Multilevel changes in bacterial properties on long-term exposure to hydrocarbons and impact of these cells on fresh-water communities. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 729:138956. [PMID: 32498169 DOI: 10.1016/j.scitotenv.2020.138956] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 04/20/2020] [Accepted: 04/22/2020] [Indexed: 06/11/2023]
Abstract
To handle the impact of habitat transformations, the microbial cells developed mechanisms aimed at adjustment of their biological processes in response to signals indicating environmental changes. One of the first changes in their properties is observed on their surface, which has direct contact with the dynamically varying surroundings. In this study, we present results of changes in the cell surface properties which may have a decisive impact on the xenobiotics' bioavailability and microbial cell survival. These changes influence their ability to remove xenobiotics by accelerating and empowering this process. Moreover, the application of microorganisms exposed for long-term to hydrocarbons in bioremediation processes might have positive impact on biodegradation of the latter in the natural environment as well as natural microbial community diversity. This study demonstrates a variety of microbial cell mechanisms of adaptation to long-term exposure to hydrocarbons and their potential as the bioremediation tools.
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Affiliation(s)
- Agata Zdarta
- Institute of Chemical Technology and Engineering, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland.
| | - Wojciech Smułek
- Institute of Chemical Technology and Engineering, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland
| | - Ewa Kaczorek
- Institute of Chemical Technology and Engineering, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland
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Aubé J, Senin P, Bonin P, Pringault O, Jeziorski C, Bouchez O, Klopp C, Guyoneaud R, Goñi-Urriza M. Meta-omics Provides Insights into the Impact of Hydrocarbon Contamination on Microbial Mat Functioning. MICROBIAL ECOLOGY 2020; 80:286-295. [PMID: 32076743 DOI: 10.1007/s00248-020-01493-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Accepted: 02/04/2020] [Indexed: 06/10/2023]
Abstract
Photosynthetic microbial mats are stable, self-supported communities. Due to their coastal localization, these mats are frequently exposed to hydrocarbon contamination and are able to grow on it. To decipher how this contamination disturbs the functioning of microbial mats, we compared two mats: a contaminated mat exposed to chronic petroleum contamination and a reference mat. The taxonomic and metabolic structures of the mats in spring and fall were determined using metagenomic and metatranscriptomic approaches. Extremely high contamination disturbed the seasonal variations of the mat. ABC transporters, two-component systems, and type IV secretion system-related genes were overabundant in the contaminated mats. Xenobiotic degradation metabolism was minor in the metagenomes of both mats, and only the expression of genes involved in polycyclic aromatic hydrocarbon degradation was higher in the contaminated mat. Interestingly, the expression rates of genes involved in hydrocarbon activation decreased during the 1-year study period, concomitant with the decrease in easily degradable hydrocarbons, suggesting a transient effect of hydrocarbon contamination. Alteromonadales and Oceanospirillales hydrocarbonoclastic bacteria appeared to be key in hydrocarbon remediation in the contaminated mat. Overall, the contaminated microbial mat was able to cope with hydrocarbon contamination and displayed an adaptive functioning that modified seasonal behaviour.
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Affiliation(s)
- Johanne Aubé
- Environmental Microbiology, Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France
- Laboratoire de Microbiologie des Environnements Extrêmes, UMR6197, IFREMER, CNRS, Université de Bretagne Occidentale, Plouzané, France
| | - Pavel Senin
- Environmental Microbiology, Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France
- Plateforme Bioinformatique Genotoul, UR875 Biométrie et Intelligence Artificielle, INRA, Castanet-Tolosan, France
| | - Patricia Bonin
- Mediterranean Institute of Oceanography (MIO), Aix Marseille University, Université de Toulon, CNRS/INSU/IRD, UM 110, Marseille, France
| | - Olivier Pringault
- UMR 9190 MARBEC IRD-Ifremer-CNRS, Université de Montpellier, Place Eugène Bataillon, Montpellier, France
| | | | - Olivier Bouchez
- GeT-PlaGe, Genotoul, INRA Auzeville, Castanet-Tolosan, France
| | - Christophe Klopp
- Plateforme Bioinformatique Genotoul, UR875 Biométrie et Intelligence Artificielle, INRA, Castanet-Tolosan, France
| | - Rémy Guyoneaud
- Environmental Microbiology, Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France
| | - Marisol Goñi-Urriza
- Environmental Microbiology, Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France.
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Uribe‐Flores M, Cerqueda‐García D, Hernández‐Nuñez E, Cadena S, García‐Cruz N, Trejo‐Hernández M, Aguirre‐Macedo M, García‐Maldonado J. Bacterial succession and co‐occurrence patterns of an enriched marine microbial community during light crude oil degradation in a batch reactor. J Appl Microbiol 2019; 127:495-507. [DOI: 10.1111/jam.14307] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 04/15/2019] [Accepted: 05/06/2019] [Indexed: 12/17/2022]
Affiliation(s)
- M.M. Uribe‐Flores
- Departamento de Recursos del Mar Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV) Unidad Mérida Mérida Mexico
| | - D. Cerqueda‐García
- Consorcio de Investigación del Golfo de México (CIGoM) Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV) Unidad Mérida Mérida Mexico
| | - E. Hernández‐Nuñez
- CONACYT – Departamento de Recursos del Mar Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV) Unidad Mérida Mérida Mexico
| | - S. Cadena
- Departamento de Recursos del Mar Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV) Unidad Mérida Mérida Mexico
| | - N.U. García‐Cruz
- Consorcio de Investigación del Golfo de México (CIGoM) Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV) Unidad Mérida Mérida Mexico
| | - M.R. Trejo‐Hernández
- Centro de Investigación en Biotecnología Universidad Autónoma del Estado de Morelos Cuernavaca, Morelos Mexico
| | - M.L. Aguirre‐Macedo
- Departamento de Recursos del Mar Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV) Unidad Mérida Mérida Mexico
| | - J.Q. García‐Maldonado
- CONACYT – Departamento de Recursos del Mar Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV) Unidad Mérida Mérida Mexico
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Limited congruence exhibited across microbial, meiofaunal and macrofaunal benthic assemblages in a heterogeneous coastal environment. Sci Rep 2018; 8:15500. [PMID: 30341362 PMCID: PMC6195585 DOI: 10.1038/s41598-018-33799-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 10/04/2018] [Indexed: 02/01/2023] Open
Abstract
One of the most common approaches for investigating the ecology of spatially complex environments is to examine a single biotic assemblage present, such as macroinvertebrates. Underlying this approach are assumptions that sampled and unsampled taxa respond similarly to environmental gradients and exhibit congruence across different sites. These assumptions were tested for five benthic groups of various sizes (archaea, bacteria, microbial eukaryotes/protists, meiofauna and macrofauna) in Plymouth Sound, a harbour with many different pollution sources. Sediments varied in granulometry, hydrocarbon and trace metal concentrations. Following variable reduction, canonical correspondence analysis did not identify any associations between sediment characteristics and assemblage composition of archaea or macrofauna. In contrast, variation in bacteria was associated with granulometry, trace metal variations and bioturbation (e.g. community bioturbation potential). Protists varied with granulometry, hydrocarbon and trace metal predictors. Meiofaunal variation was associated with hydrocarbon and bioturbation predictors. Taxon turnover between sites varied with only three out of 10 group pairs showing congruence (meiofauna-protists, meiofauna-macrofauna and protists-macrofauna). While our results support using eukaryotic taxa as proxies for others, the lack of congruence suggests caution should be applied to inferring wider indicator or functional interpretations from studies of a single biotic assemblage.
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Bouchet S, Goñi-Urriza M, Monperrus M, Guyoneaud R, Fernandez P, Heredia C, Tessier E, Gassie C, Point D, Guédron S, Achá D, Amouroux D. Linking Microbial Activities and Low-Molecular-Weight Thiols to Hg Methylation in Biofilms and Periphyton from High-Altitude Tropical Lakes in the Bolivian Altiplano. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:9758-9767. [PMID: 30037219 DOI: 10.1021/acs.est.8b01885] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The sources and factors controlling concentrations of monomethylmercury (MMHg) in aquatic ecosystems need to be better understood. Here, we investigated Hg transformations in sediments, periphyton associated with green algae's or aquatic plants, and benthic biofilms from the Lake Titicaca hydrosystem and compared them to the occurrence of active methylating microorganisms and extracellular Hg ligands. Intense Hg methylation was found in benthic biofilms and green algae's periphyton, while it remained low in sediments and aquatic plants' periphyton. Demethylation varied between compartments but remained overall in the same range. Hg methylation was mainly carried out by sulfate reducers, although methanogens also played a role. Its variability between compartments was first explained by the presence or absence of the hgcAB genes. Next, both benthic biofilm and green algae's periphyton exhibited a great diversity of extracellular low-molecular-weight (LMW) thiols (13 or 14 compounds) present at a range of a few nmol L-1 or μmol L-1 but clearly dominated by cysteine and 3-mercaptopropionic acid. Hg methylation was overall positively correlated to the total thiol concentrations, albeit to different extents according to the compartment and conditions. This work is the first examining the interplay between active methylating bacterial communities and extracellular ligands in heterotrophic biofilms and supports the involvement of LMW thiols in Hg methylation in real aquatic systems.
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Affiliation(s)
- Sylvain Bouchet
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - Marisol Goñi-Urriza
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - Mathilde Monperrus
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - Rémy Guyoneaud
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - Pablo Fernandez
- Unidad de Calidad Ambiental (UCA) , Instituto de Ecologia, Universidad Mayor de San Andres, Campus Universitario de Cota Cota , Calle 27 , 00000 La Paz , Bolivia
| | - Carlos Heredia
- Unidad de Calidad Ambiental (UCA) , Instituto de Ecologia, Universidad Mayor de San Andres, Campus Universitario de Cota Cota , Calle 27 , 00000 La Paz , Bolivia
| | - Emmanuel Tessier
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - Claire Gassie
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - David Point
- Unidad de Calidad Ambiental (UCA) , Instituto de Ecologia, Universidad Mayor de San Andres, Campus Universitario de Cota Cota , Calle 27 , 00000 La Paz , Bolivia
- Géosciences Environnement Toulouse, UMR5563, IRD UR 234 , Université Paul Sabatier , 14 Avenue Edouard Belin , 31400 Toulouse , France
| | - Stéphane Guédron
- Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre , 38000 Grenoble , France
- Laboratorio de Hidroquímica , Instituto de Investigaciones Químicas, Universidad Mayor de San Andrés, Campus Universitario de Cota-Cota , casilla 3161 , 00000 La Paz , Bolivia
| | - Dario Achá
- Unidad de Calidad Ambiental (UCA) , Instituto de Ecologia, Universidad Mayor de San Andres, Campus Universitario de Cota Cota , Calle 27 , 00000 La Paz , Bolivia
| | - David Amouroux
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
- Unidad de Calidad Ambiental (UCA) , Instituto de Ecologia, Universidad Mayor de San Andres, Campus Universitario de Cota Cota , Calle 27 , 00000 La Paz , Bolivia
- Géosciences Environnement Toulouse, UMR5563, IRD UR 234 , Université Paul Sabatier , 14 Avenue Edouard Belin , 31400 Toulouse , France
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