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    Different processes shape prokaryotic and picoeukaryotic assemblages in the sunlit ocean microbiome

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    Preprintfile1 (5)_removed.pdf
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    Type
    Preprint
    Authors
    Logares, Ramiro cc
    Deutschmann, Ina M.
    Giner, Caterina R cc
    Krabberød, Anders K. cc
    Schmidt, Thomas S. B.
    Rubinat-Ripoll, Laura cc
    Mestre, Mireia cc
    Salazar, Guillem cc
    Ruiz-González, Clara cc
    Sebastián, Marta
    de Vargas, Colomban cc
    Acinas, Silvia G cc
    Duarte, Carlos M. cc
    Gasol, Josep M. cc
    Massana, Ramon cc
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2018-07-23
    Permanent link to this record
    http://hdl.handle.net/10754/668622
    
    Metadata
    Show full item record
    Abstract
    ABSTRACTThe smallest members of the sunlit-ocean microbiome (prokaryotes and picoeukaryotes) participate in a plethora of ecosystem functions with planetary-scale effects. Understanding the processes determining the spatial turnover of this assemblage can help us better comprehend the links between microbiome species composition and ecosystem function. Ecological theory predicts thatselection,dispersalanddriftare main drivers of species distributions, yet, the relative quantitative importance of these ecological processes in structuring the surface-ocean microbiome is barely known. Here we quantified the role of selection, dispersal and drift in structuring surface-ocean prokaryotic and picoeukaryotic assemblages by using community DNA-sequence data collected during the global Malaspina expedition. We found that dispersal limitation was the dominant process structuring picoeukaryotic communities, while a balanced combination of dispersal limitation, selection and drift shaped prokaryotic counterparts. Subsequently, we determined the agents exerting abiotic selection as well as the spatial patterns emerging from the action of different ecological processes. We found that selection exerted via temperature had a strong influence on the structure of prokaryotic communities, particularly on species co-occurrences, a pattern not observed among communities of picoeukaryotes. Other measured abiotic variables had limited selective effects on microbiome structure. Picoeukaryotes presented a higher differentiation between neighbouring communities and a higher distance-decay when compared to prokaryotes, agreeing with their higher dispersal limitation. Finally, drift seemed to have a limited role in structuring the sunlit-ocean microbiome. The different predominance of ecological processes acting on particular subsets of the ocean microbiome suggests uneven responses to environmental change.SIGNIFICANCE STATEMENTThe global ocean contains one of the largest microbiomes on Earth and changes on its structure can impact the functioning of the biosphere. Yet, we are far from understanding the mechanisms that structure the global ocean microbiome, that is, the relative importance of environmentalselection,dispersaland random events (drift). We evaluated the role of these processes at the global scale, based on data derived from a circumglobal expedition and found that these ecological processes act differently on prokaryotes and picoeukaryotes, two of the main components of the ocean microbiome. Our work represents a significant contribution to understand the assembly of marine microbial communities, providing also insights on the links between ecological mechanisms, microbiome structure and ecosystem function.
    Citation
    Logares, R., Deutschmann, I. M., Giner, C. R., Krabberød, A. K., Schmidt, T. S. B., Rubinat-Ripoll, L., … Massana, R. (2018). Different processes shape prokaryotic and picoeukaryotic assemblages in the sunlit ocean microbiome. doi:10.1101/374298
    Publisher
    Cold Spring Harbor Laboratory
    DOI
    10.1101/374298
    Additional Links
    http://biorxiv.org/lookup/doi/10.1101/374298
    https://www.research-collection.ethz.ch/bitstream/20.500.11850/456415/3/374298v1.full.pdf
    ae974a485f413a2113503eed53cd6c53
    10.1101/374298
    Scopus Count
    Collections
    Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Preprints; Marine Science Program

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