Introduced annuals mediate climate-driven community change in Mediterranean prairies of the Pacific Northwest, USA

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dc.contributor.authorReed, Paul B.
dc.contributor.authorPfeifer-Meister, Laurel E.
dc.contributor.authorRoy, Bitty A.
dc.contributor.authorJohnson, Bart R.
dc.contributor.authorBailes, Graham T.
dc.contributor.authorNelson, Aaron A.
dc.contributor.authorBridgham, Scott D.
dc.date.accessioned2023-10-24T00:37:53Z
dc.date.available2023-10-24T00:37:53Z
dc.date.issued2021-11-01
dc.description12 pagesen_US
dc.description.abstractAim: How climate change will alter plant functional group composition is a critical question given the well-recognized effects of plant functional groups on ecosystem services. While climate can have direct effects on different functional groups, indirect effects mediated through changes in biotic interactions have the potential to amplify or counteract direct climatic effects. As a result, identifying the underlying causes for climate effects on plant communities is important to conservation and restoration initiatives. Location: Western Pacific Northwest (Oregon and Washington), USA. Methods: Utilizing a 3-year experiment in three prairie sites across a 520-km latitudinal climate gradient, we manipulated temperature and precipitation and recorded plant cover at the peak of each growing season. We used structural equation models to examine how abiotic drivers (i.e. temperature, moisture and soil nitrogen) controlled functional group cover, and how these groups in turn determined overall plant diversity. Results: Warming increased the cover of introduced annual species, causing subsequent declines in other functional groups and diversity. While we found direct effects of temperature and moisture on extant vegetation (i.e. native annuals, native perennials and introduced perennials), these effects were typically amplified by introduced annuals. Competition for moisture and light or space, rather than nitrogen, were critical mechanisms of community change in this seasonally water-limited Mediterranean-climate system. Diversity declines were driven by reductions in native annual cover and increasing dominance by introduced annuals. Main conclusions: A shift towards increasing introduced annual dominance in this system may be akin to that previously experienced in California grasslands, resulting in the “Californication” of Pacific Northwest prairies. Such a phenomenon may challenge local land managers in their efforts to maintain species-rich and functionally diverse prairie ecosystems in the future.en_US
dc.identifier.citationReed, P. B., Pfeifer-Meister, L. E., Roy, B. A., Johnson, B. R., Bailes, G. T., Nelson, A. A., & Bridgham, S. D. (2021). Introduced annuals mediate climate-driven community change in Mediterranean prairies of the Pacific Northwest, USA. Diversity and Distributions, 27, 2584–2595. https://doi.org/10.1111/ddi.13426en_US
dc.identifier.urihttps://doi.org/10.1111/ddi.13426
dc.identifier.urihttps://hdl.handle.net/1794/29006
dc.language.isoenen_US
dc.publisherWileyen_US
dc.rightsCreative Commons BY-NC-ND 4.0-USen_US
dc.subjectClimate manipulationsen_US
dc.subjectDiversityen_US
dc.subjectEvennessen_US
dc.subjectFunctional groupsen_US
dc.subjectInvasionen_US
dc.subjectPlant communityen_US
dc.subjectRichnessen_US
dc.subjectSoil moistureen_US
dc.subjectStructural equation modellingen_US
dc.subjectWarmingen_US
dc.titleIntroduced annuals mediate climate-driven community change in Mediterranean prairies of the Pacific Northwest, USAen_US
dc.typeArticleen_US

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