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Iowa State University

Plant Sciences

Ecology, Evolution and Organismal Biology Publications

Grassland

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Articles 1 - 4 of 4

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Mycorrhizal Colonization And Its Relationship With Plant Performance Differs Between Exotic And Native Grassland Plant Species, Aleksandra Checinska Sielaff, H. Wayne Polley, Andres Fuentes-Ramirez, Kirsten Hofmockel, Brian J. Wilsey Jan 2019

Mycorrhizal Colonization And Its Relationship With Plant Performance Differs Between Exotic And Native Grassland Plant Species, Aleksandra Checinska Sielaff, H. Wayne Polley, Andres Fuentes-Ramirez, Kirsten Hofmockel, Brian J. Wilsey

Ecology, Evolution and Organismal Biology Publications

Many grasslands have been transformed by exotic species with potentially novel ecological interactions. We hypothesized that exotic and native plant species differ, on average, in their percentage mycorrhizal colonization, and that mycorrhizal colonization is positively related to plant performance in the field. We compared colonization by arbuscular mycorrhizae (AM) fungi in perennial native and exotic species that were paired phylogenetically and by functional groups and grown under a common environment in field plots in Central Texas, USA. Roots were collected from plants in monoculture plots, stained, and percent colonization was assessed with a microscope. Aboveground biomass and dominance in mixture ...


Spatial Heterogeneity In Species Composition Constrains Plant Community Responses To Herbivory And Fertilisation, Dorothee Hodapp, Lori A. Biederman, Philip A. Fay, Et Al. Sep 2018

Spatial Heterogeneity In Species Composition Constrains Plant Community Responses To Herbivory And Fertilisation, Dorothee Hodapp, Lori A. Biederman, Philip A. Fay, Et Al.

Ecology, Evolution and Organismal Biology Publications

Environmental change can result in substantial shifts in community composition. The associated immigration and extinction events are likely constrained by the spatial distribution of species. Still, studies on environmental change typically quantify biotic responses at single spatial (time series within a single plot) or temporal (spatial beta diversity at single time points) scales, ignoring their potential interdependence. Here, we use data from a global network of grassland experiments to determine how turnover responses to two major forms of environmental change – fertilisation and herbivore loss – are affected by species pool size and spatial compositional heterogeneity. Fertilisation led to higher rates of ...


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 ...


Invaded Grassland Communities Have Altered Stability-Maintenance Mechanisms But Equal Stability Compared To Native Communities, Brian J. Wilsey, Pedram P. Daneshgar, Kirsten S. Hofmockel, H. Wayne Polley Jan 2014

Invaded Grassland Communities Have Altered Stability-Maintenance Mechanisms But Equal Stability Compared To Native Communities, Brian J. Wilsey, Pedram P. Daneshgar, Kirsten S. Hofmockel, H. Wayne Polley

Ecology, Evolution and Organismal Biology Publications

Theory predicts that stability should increase with diversity via several mechanisms. We tested predictions in a 5-year experiment that compared low-diversity exotic to high-diversity native plant mixtures under two irrigation treatments. The study included both wet and dry years. Variation in biomass across years (CV) was 50% lower in mixtures than monocultures of both native and exotic species. Growth among species was more asynchronous and overyielding values were greater during and after a drought in native than exotic mixtures. Mean-variance slopes indicated strong portfolio effects in both community types, but the intercept was higher for exotics than for natives, suggesting ...