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Iowa State University

Plant Sciences

Ecology, Evolution and Organismal Biology Publications

Precipitation

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Variability In Community Productivity—Mediating Effects Of Vegetation Attributes, H. Wayne Polley, Brian J. Wilsey May 2018

Variability In Community Productivity—Mediating Effects Of Vegetation Attributes, H. Wayne Polley, Brian J. Wilsey

Ecology, Evolution and Organismal Biology Publications

  1. Plant productivity varies through time in response to environmental fluctuations. Reducing variability in productivity requires an improved understanding of how plant community attributes interact with environmental fluctuations to influence plant growth dynamics. We evaluated links between two community attributes, species diversity and abundance‐weighted values of specific leaf area (SLA), and temporal variability in grassland productivity at patch (local) and aggregate (multipatch) spatial scales.
  2. Aggregate communities were created by combining patches of spatially distinct communities of perennial plant species from grassland biodiversity experiments in Texas, USA. Interannual variability in above‐ground net primary productivity (ANPP) of aggregate communities was analysed ...


Priority Effects Are Affected By Precipitation Variability And Are Stronger In Exotic Than Native Grassland Species, Kaitlin M. Goodale, Brian J. Wilsey Apr 2018

Priority Effects Are Affected By Precipitation Variability And Are Stronger In Exotic Than Native Grassland Species, Kaitlin M. Goodale, Brian J. Wilsey

Ecology, Evolution and Organismal Biology Publications

Exotic perennial grassland species often green up earlier than their native counterparts, allowing them to gain an advantage by dominating resources early (priority effects). Precipitation variability is expected to increase with climate change, and may alter the strength of priority effects. We hypothesized that exotics will have stronger priority effects than natives, precipitation variability will impact the strength of priority effects, and precipitation variability will impact the priority effects of native species more than those of exotics. We seeded one of five native or five exotic grassland species from the Central U.S. spanning multiple functional groups 28 days prior ...


Impacts Of Climate Change Drivers On C4 Grassland Productivity: Scaling Driver Effects Through The Plant Community, H. Wayne Polley, Justin D. Derner, Robert B. Jackson, Brian J. Wilsey, Philip A. Fay Jan 2014

Impacts Of Climate Change Drivers On C4 Grassland Productivity: Scaling Driver Effects Through The Plant Community, H. Wayne Polley, Justin D. Derner, Robert B. Jackson, Brian J. Wilsey, Philip A. Fay

Ecology, Evolution and Organismal Biology Publications

Climate change drivers affect plant community productivity via three pathways: (i) direct effects of drivers on plants; (ii) the response of species abundances to drivers (community response); and (iii) the feedback effect of community change on productivity (community effect). The contribution of each pathway to driver–productivity relationships depends on functional traits of dominant species. We used data from three experiments in Texas, USA, to assess the role of community dynamics in the aboveground net primary productivity (ANPP) response of C4 grasslands to two climate drivers applied singly: atmospheric CO2 enrichment and augmented summer precipitation. The ANPPdriver response differed among ...