Spatial Heterogeneity in Soil Microbes Alters Outcomes of Plant Competition

dc.contributor.author Abbott, Karen
dc.contributor.author Biederman, Lori
dc.contributor.author Karst, Justine
dc.contributor.author Biederman, Lori
dc.contributor.author Borrett, Stuart
dc.contributor.author Hastings, Alan
dc.contributor.author Walsh, Vonda
dc.contributor.author Bever, James
dc.contributor.department Ecology, Evolution and Organismal Biology
dc.date 2018-02-19T06:02:20.000
dc.date.accessioned 2020-06-30T02:17:29Z
dc.date.available 2020-06-30T02:17:29Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2015
dc.date.issued 2015-05-06
dc.description.abstract <p>Plant species vary greatly in their responsiveness to nutritional soil mutualists, such as mycorrhizal fungi and rhizobia, and this responsiveness is associated with a trade-off in allocation to root structures for resource uptake. As a result, the outcome of plant competition can change with the density of mutualists, with microbe-responsive plant species having high competitive ability when mutualists are abundant and non-responsive plants having high competitive ability with low densities of mutualists. When responsive plant species also allow mutualists to grow to greater densities, changes in mutualist density can generate a positive feedback, reinforcing an initial advantage to either plant type. We study a model of mutualist-mediated competition to understand outcomes of plant-plant interactions within a patchy environment. We find that a microbe-responsive plant can exclude a non-responsive plant from some initial conditions, but it must do so across the landscape including in the microbe-free areas where it is a poorer competitor. Otherwise, the non-responsive plant will persist in both mutualist-free and mutualist-rich regions. We apply our general findings to two different biological scenarios: invasion of a non-responsive plant into an established microbe-responsive native population, and successional replacement of non-responders by microbe-responsive species. We find that resistance to invasion is greatest when seed dispersal by the native plant is modest and dispersal by the invader is greater. Nonetheless, a native plant that relies on microbial mutualists for competitive dominance may be particularly vulnerable to invasion because any disturbance that temporarily reduces its density or that of the mutualist creates a window for a non-responsive invader to establish dominance. We further find that the positive feedbacks from associations with beneficial soil microbes create resistance to successional turnover. Our theoretical results constitute an important first step toward developing a general understanding of the interplay between mutualism and competition in patchy landscapes, and generate qualitative predictions that may be tested in future empirical studies.</p>
dc.description.comments <p>This article is published as Abbott, Karen C., Justine Karst, Lori A. Biederman, Stuart R. Borrett, Alan Hastings, Vonda Walsh, and James D. Bever. "Spatial heterogeneity in soil microbes alters outcomes of plant competition." PloS one 10, no. 5 (2015): e0125788. doi: <a href="https://doi.org/10.1371/journal.pone.0125788">10.1371/journal.pone.0125788</a>. Posted with permission.</p>
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dc.identifier archive/lib.dr.iastate.edu/eeob_ag_pubs/245/
dc.identifier.articleid 1249
dc.identifier.contextkey 11220132
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath eeob_ag_pubs/245
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/23118
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/eeob_ag_pubs/245/2015_Biederman_SpatialHeterogeneity.PDF|||Fri Jan 14 22:53:58 UTC 2022
dc.source.uri 10.1371/journal.pone.0125788
dc.subject.disciplines Behavior and Ethology
dc.subject.disciplines Desert Ecology
dc.subject.disciplines Ecology and Evolutionary Biology
dc.subject.disciplines Plant Biology
dc.subject.disciplines Terrestrial and Aquatic Ecology
dc.title Spatial Heterogeneity in Soil Microbes Alters Outcomes of Plant Competition
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 8c742964-cca6-44c7-ba97-d6a9b5ec7a59
relation.isOrgUnitOfPublication 6fa4d3a0-d4c9-4940-945f-9e5923aed691
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