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    The Role of Host Demographic Storage in the Ecological Dynamics of Heritable Symbionts

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    Author
    Bibian, Andrew J.
    Rudgers, Jennifer A.
    Miller, Tom E.X.
    Date
    2016
    Citation
    Bibian, Andrew J., Rudgers, Jennifer A. and Miller, Tom E.X.. "The Role of Host Demographic Storage in the Ecological Dynamics of Heritable Symbionts." The American Naturalist, 188, no. 4 (2016) 446-459. https://doi.org/10.1086/687965.
    Published Version
    https://doi.org/10.1086/687965
    Abstract
    Heritable symbioses are widespread and ecologically important. Many host organisms have complex life cycles that include diverse opportunities for symbionts to affect their host and be lost during development. Yet, existing theory takes a simplified view of host demography. Here, we generalize symbiosis theory to understand how demographic “storage” in the form of dormant or prereproductive life stages can modify symbiosis dynamics. Using grass-endophyte symbioses as context, we developed models to contrast the role of the seed bank (a storage stage) against the reproductive stage in symbiont persistence and prevalence. We find that the seed bank is as important as or more important than the reproductive stage in driving symbiont dynamics, as long as passage through the seed bank is obligate. Flexible entry to the seed bank substantially weakens its influence on symbiont persistence but can modify prevalence in counterintuitive ways. Our models identify a role for legacy effects, where hosts that lose symbionts retain their demographic influence. The retention of benefits via legacy effects can reduce symbiont prevalence and even cause prevalence to decline with increasing benefits to hosts because symbiont-free hosts carry those benefits. Our results resolve connections between individual-level host-symbiont interactions and population-level patterns, providing guidance for empirical studies.
    Keyword
    host-symbiont dynamics; demographic modeling; stage-structured populations; mutualism; Epichloë; More... fungal endophyte Less...
    Type
    Journal article
    Citable link to this page
    http://hdl.handle.net/1911/94301
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    • BioSciences Publications [134]
    • Faculty Publications [2827]

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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892