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    Soilborne fungi have host affinity and host-specific effects on seed germination and survival in a lowland tropical forest

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    Sarmiento-et-al-2017.pdf
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    Author
    Sarmiento, Carolina
    Zalamea, Paul-Camilo
    Dalling, James W.
    Davis, Adam S.
    Stump, Simon M.
    U’Ren, Jana M.
    Arnold, A. Elizabeth
    Affiliation
    Univ Arizona, Dept Ecol & Evolutionary Biol
    Univ Arizona, Dept Agr & Biosyst Engn
    Univ Arizona, Sch Plant Sci
    Issue Date
    2017-10-24
    Keywords
    diversity
    pioneer species
    Janzen-Connell
    soil seed bank
    pathogen
    
    Metadata
    Show full item record
    Publisher
    NATL ACAD SCIENCES
    Citation
    Sarmiento, C., Zalamea, P. C., Dalling, J. W., Davis, A. S., Stump, S. M., U’Ren, J. M., & Arnold, A. E. (2017). Soilborne fungi have host affinity and host-specific effects on seed germination and survival in a lowland tropical forest. Proceedings of the National Academy of Sciences, 114(43), 11458-11463.
    Journal
    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
    Rights
    Copyright © The Author(s).
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The Janzen-Connell (JC) hypothesis provides a conceptual framework for explaining the maintenance of tree diversity in tropical forests. Its central tenet-that recruits experience high mortality near conspecifics and at high densities-assumes a degree of host specialization in interactions between plants and natural enemies. Studies confirming JC effects have focused primarily on spatial distributions of seedlings and saplings, leaving major knowledge gaps regarding the fate of seeds in soil and the specificity of the soilborne fungi that are their most important antagonists. Here we use a common garden experiment in a lowland tropical forest in Panama to show that communities of seed-infecting fungi are structured predominantly by plant species, with only minor influences of factors such as local soil type, forest characteristics, or time in soil (1-12 months). Inoculation experiments confirmed that fungi affected seed viability and germination in a host-specific manner and that effects on seed viability preceded seedling emergence. Seeds are critical components of reproduction for tropical trees, and the factors influencing their persistence, survival, and germination shape the populations of seedlings and saplings on which current perspectives regarding forest dynamics are based. Together these findings bring seed dynamics to light in the context of the JC hypothesis, implicating them directly in the processes that have emerged as critical for diversity maintenance in species-rich tropical forests.
    Note
    No copyright information listed.
    ISSN
    0027-8424
    1091-6490
    PubMed ID
    28973927
    DOI
    10.1073/pnas.1706324114
    Version
    Final accepted manuscript
    Sponsors
    NSF [DEB-1120205, DEB-1119758]; College of Agriculture and Life Sciences at The University of Arizona; Simons Foundation [429440]
    Additional Links
    http://www.pnas.org/lookup/doi/10.1073/pnas.1706324114
    ae974a485f413a2113503eed53cd6c53
    10.1073/pnas.1706324114
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