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  • 1
    Online Resource
    Online Resource
    Proceedings of the National Academy of Sciences ; 2013
    In:  Proceedings of the National Academy of Sciences Vol. 110, No. 15 ( 2013-04-09), p. 6004-6009
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 110, No. 15 ( 2013-04-09), p. 6004-6009
    Abstract: Marine Archaea are important players among microbial plankton and significantly contribute to biogeochemical cycles, but details regarding their community structure and long-term seasonal activity and dynamics remain largely unexplored. In this study, we monitored the interannual archaeal community composition of abundant and rare biospheres in northwestern Mediterranean Sea surface waters by pyrosequencing 16S rDNA and rRNA. A detailed analysis of the rare biosphere structure showed that the rare archaeal community was composed of three distinct fractions. One contained the rare Archaea that became abundant at different times within the same ecosystem; these cells were typically not dormant, and we hypothesize that they represent a local seed bank that is specific and essential for ecosystem functioning through cycling seasonal environmental conditions. The second fraction contained cells that were uncommon in public databases and not active, consisting of aliens to the studied ecosystem and representing a nonlocal seed bank of potential colonizers. The third fraction contained Archaea that were always rare but actively growing; their affiliation and seasonal dynamics were similar to the abundant microbes and could not be considered a seed bank. We also showed that the major archaeal groups, Thaumarchaeota marine group I and Euryarchaeota group II.B in winter and Euryarchaeota group II.A in summer, contained different ecotypes with varying activities. Our findings suggest that archaeal diversity could be associated with distinct metabolisms or life strategies, and that the rare archaeal biosphere is composed of a complex assortment of organisms with distinct histories that affect their potential for growth.
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    RVK:
    RVK:
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2013
    detail.hit.zdb_id: 209104-5
    detail.hit.zdb_id: 1461794-8
    SSG: 11
    SSG: 12
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  • 2
    In: FEMS Microbiology Ecology, Oxford University Press (OUP), Vol. 96, No. 7 ( 2020-07-01)
    Abstract: Basaltic rocks play a significant role in CO2 sequestration from the atmosphere during their weathering. Moreover, the primary microorganisms that colonize them, by providing mineral elements and nutrients, are shown to promote growth of diverse heterotrophic communities and plants, therefore positively impacting Earth's long-term climate balance. However, the first steps of microbial colonization and subsequent rock weathering remain poorly understood, especially regarding microbial communities over a chronological sequence. Here, we analyzed the microbial communities inhabiting the soil developed in crevices on lava flows derived from different eruptions on Fogo Island. Investigated soils show typically low carbon and nitrogen content and are relatively similar to one another regarding their phylogenetic composition, and similar to what was recorded in large soil surveys with dominance of Actinobacteria and Proteobacteria. Moreover, our results suggest a stronger effect of the organic carbon than the lava flow age in shaping microbial communities as well as the possibility of exogenous sources of bacteria as important colonizers. Furthermore, archaea reach up to 8.4% of the total microbial community, dominated by the Soil Crenarchaeotic Group, including the ammonium-oxidizer Candidatus Nitrososphaera sp. Therefore, this group might be largely responsible for ammonia oxidation under the environmental conditions found on Fogo.
    Type of Medium: Online Resource
    ISSN: 0168-6496 , 1574-6941
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2020
    detail.hit.zdb_id: 1501712-6
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 1996
    In:  Journal of Molecular Evolution Vol. 43, No. 1 ( 1996-7), p. 19-27
    In: Journal of Molecular Evolution, Springer Science and Business Media LLC, Vol. 43, No. 1 ( 1996-7), p. 19-27
    Type of Medium: Online Resource
    ISSN: 0022-2844 , 1432-1432
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1996
    detail.hit.zdb_id: 1464309-1
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    Wiley ; 2020
    In:  Molecular Ecology Vol. 29, No. 21 ( 2020-11), p. 4143-4156
    In: Molecular Ecology, Wiley, Vol. 29, No. 21 ( 2020-11), p. 4143-4156
    Abstract: Bacterial populations differentiate over time and space to form distinct genetic units. The mechanisms governing this diversification are presumed to result from the ecological context of living units to adapt to specific niches. Recently, a model assuming the acquisition of advantageous genes among populations rather than whole genome sweeps has emerged to explain population differentiation. However, the characteristics of these exchanged, or flexible, genes and whether their evolution is driven by adaptive or neutral processes remain controversial. By analysing the flexible genome of single‐amplified genomes of co‐occurring populations of the marine Prochlorococcus HLII ecotype, we highlight that genomic compartments – rather than population units – are characterized by different evolutionary trajectories. The dynamics of gene fluxes vary across genomic compartments and therefore the effectiveness of selection depends on the fluctuation of the effective population size along the genome. Taken together, these results support the drift‐barrier model of bacterial evolution.
    Type of Medium: Online Resource
    ISSN: 0962-1083 , 1365-294X
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2020749-9
    detail.hit.zdb_id: 1126687-9
    SSG: 12
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  • 5
    In: Molecular Ecology Resources, Wiley, Vol. 23, No. 1 ( 2023-01), p. 222-232
    Abstract: Freshwater is a critical resource for human survival but severely threatened by anthropogenic activities and climate change. These changes strongly impact the abundance and diversity of the microbial communities which are key players in the functioning of these aquatic ecosystems. Although widely documented since the emergence of high‐throughput sequencing approaches, the information on these natural microbial communities is scattered among thousands of publications and it is therefore difficult to investigate the temporal dynamics and the spatial distribution of microbial taxa within or across ecosystems. To fill this gap and in the FAIR principles context we built a manually curated and standardized microbial freshwater –omics database (FreshOmics). Based on recognized ontologies (ENVO, MIMICS, GO, ISO), FreshOmics describes 29 different types of freshwater ecosystems and uses standardized attributes to depict biological samples, sequencing protocols and article attributes for more than 2487 geographical locations across 71 countries around the world. The database contains 24,808 sequence identifiers (i.e., Run_Id / Exp_ID, mainly from SRA/DDBJ SRA/ENA, GSA and MG‐RAST repositories) covering all sequence‐based ‐omics approaches used to investigate bacteria, archaea, microbial eukaryotes, and viruses. Therefore, FreshOmics allows accurate and comprehensive analyses of microbial communities to answer questions related to their roles in freshwater ecosystems functioning and resilience, especially through meta‐analysis studies. This collection also highlights different sort of errors in published works (e.g., wrong coordinates, sample type, material, spelling).
    Type of Medium: Online Resource
    ISSN: 1755-098X , 1755-0998
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2406833-0
    SSG: 12
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