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    Soil fungal effects on floral signals, rewards, and aboveground interactions in an alpine pollination web

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    Becklin_etal2011_AJB.pdf (758.8Kb)
    Issue Date
    2011-08
    Author
    Becklin, Katie M.
    Gamez, Guadelupe
    Uelk, Brian
    Raguso, Robert A.
    Galen, Candace
    Publisher
    Botanical Society of America
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    • Premise of the study: Plants interact with above- and belowground organisms; the combined effects of these interactions determine plant fitness and trait evolution. To better understand the ecological and evolutionary implications of multispecies interactions, we explored linkages between soil fungi, pollinators, and floral larcenists in Polemonium viscosum (Polemoniaceae). • Methods: Using a fungicide, we experimentally reduced fungal colonization of krummholz and tundra P. viscosum in 2008–2009. We monitored floral signals and rewards, interactions with pollinators and larcenists, and seed set for fungicide-treated and control plants. • Key results: Fungicide effects varied among traits, between interactions, and with environmental context. Treatment effects were negligible in 2008, but stronger in 2009, especially in the less-fertile krummholz habitat. There, fungicide increased nectar sugar content and damage by larcenist ants, but did not affect pollination. Surprisingly, fungicide also enhanced seed set, suggesting that direct resource costs of soil fungi exceed indirect benefits from reduced larceny. In the tundra, fungicide effects were negligible in both years. However, pooled across treatments, colonization by mycorrhizal fungi in 2009 correlated negatively with the intensity and diversity of floral volatile organic compounds, suggesting integrated above- and belowground signaling pathways. • Conclusions: Fungicide effects on floral rewards in P. viscosum link soil fungi to ecological costs of pollinator attraction. Trait-specific linkages to soil fungi should decouple expression of sensitive and buffered floral phenotypes in P. viscosum. Overall, this study demonstrates how multitrophic linkages may lead to shifting selection pressures on interaction traits, restricting the evolution of specialization.
    Description
    This is the published version. The definitive version is available at www3.interscience.wiley.com.
    URI
    http://hdl.handle.net/1808/8735
    DOI
    https://doi.org/10.3732/ajb.1000450
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    • Ecology and Evolutionary Biology Scholarly Works [1450]
    Citation
    Becklin KM, Gamez G*, Uelk B*, Raguso RA, and Galen C. 2011. Soil fungal effects on floral signals, rewards, and aboveground interactions in an alpine pollination web. American Journal of Botany 98:1299-1308. http://dx.doi.org/10.3732/ajb.1000450

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    785-864-8983

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    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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