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Iowa State University

Plant Sciences

Ecology, Evolution and Organismal Biology Publications

Nutrient Network (NutNet)

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Nutrient Availability Controls The Impact Of Mammalian Herbivores On Soil Carbon And Nitrogen Pools In Grasslands, Judith Sitters, Lori A. Biederman, Et Al. Jan 2020

Nutrient Availability Controls The Impact Of Mammalian Herbivores On Soil Carbon And Nitrogen Pools In Grasslands, Judith Sitters, Lori A. Biederman, Et Al.

Ecology, Evolution and Organismal Biology Publications

Grasslands are subject to considerable alteration due to human activities globally, including widespread changes in populations and composition of large mammalian herbivores and elevated supply of nutrients. Grassland soils remain important reservoirs of carbon (C) and nitrogen (N). Herbivores may affect both C and N pools and these changes likely interact with increases in soil nutrient availability. Given the scale of grassland soil fluxes, such changes can have striking consequences for atmospheric C concentrations and the climate. Here, we use the Nutrient Network experiment to examine the responses of soil C and N pools to mammalian herbivore exclusion across 22 ...


More Salt, Please: Global Patterns, Responses And Impacts Of Foliar Sodium In Grasslands, E. T. Borer, E. M. Lind, J. Firn, E. W. Seabloom, T. M. Anderson, E. S. Bakker, L. A. Biederman, K. J. La Pierre, A. S. Macdougall, J. L. Moore, A. C. Risch, M. Schutz, C. J. Stevens Jan 2019

More Salt, Please: Global Patterns, Responses And Impacts Of Foliar Sodium In Grasslands, E. T. Borer, E. M. Lind, J. Firn, E. W. Seabloom, T. M. Anderson, E. S. Bakker, L. A. Biederman, K. J. La Pierre, A. S. Macdougall, J. L. Moore, A. C. Risch, M. Schutz, C. J. Stevens

Ecology, Evolution and Organismal Biology Publications

Sodium is unique among abundant elemental nutrients, because most plant species do not require it for growth or development, whereas animals physiologically require sodium. Foliar sodium influences consumption rates by animals and can structure herbivores across landscapes. We quantified foliar sodium in 201 locally abundant, herbaceous species representing 32 families and, at 26 sites on four continents, experimentally manipulated vertebrate herbivores and elemental nutrients to determine their effect on foliar sodium. Foliar sodium varied taxonomically and geographically, spanning five orders of magnitude. Site‐level foliar sodium increased most strongly with site aridity and soil sodium; nutrient addition weakened the relationship ...


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 ...


Herbivory And Eutrophication Mediate Grassland Plant Nutrient Responses Across A Global Climatic Gradient, T. Michael Anderson, Daniel M. Griffith, James B. Grace, Eric M. Lind, Peter B. Adler, Lori A. Biederman, Dana M. Blumenthal, Pedro Daleo, Jennifer Firn, Nicole Hagenah, W. Stanley Harpole, Andrew S. Macdougall, Rebecca L. Mcculley, Suzanne M. Prober, Anita C. Risch, Mahesh Sankaran, Martin Schutz, Eric W. Seabloom, Carly J. Stevens, Lauren L. Sullivan, Peter D. Wragg, Elizabeth T. Borer Apr 2018

Herbivory And Eutrophication Mediate Grassland Plant Nutrient Responses Across A Global Climatic Gradient, T. Michael Anderson, Daniel M. Griffith, James B. Grace, Eric M. Lind, Peter B. Adler, Lori A. Biederman, Dana M. Blumenthal, Pedro Daleo, Jennifer Firn, Nicole Hagenah, W. Stanley Harpole, Andrew S. Macdougall, Rebecca L. Mcculley, Suzanne M. Prober, Anita C. Risch, Mahesh Sankaran, Martin Schutz, Eric W. Seabloom, Carly J. Stevens, Lauren L. Sullivan, Peter D. Wragg, Elizabeth T. Borer

Ecology, Evolution and Organismal Biology Publications

Plant stoichiometry, the relative concentration of elements, is a key regulator of ecosystem functioning and is also being altered by human activities. In this paper we sought to understand the global drivers of plant stoichiometry and compare the relative contribution of climatic vs. anthropogenic effects. We addressed this goal by measuring plant elemental (C, N, P and K) responses to eutrophication and vertebrate herbivore exclusion at eighteen sites on six continents. Across sites, climate and atmospheric N deposition emerged as strong predictors of plot‐level tissue nutrients, mediated by biomass and plant chemistry. Within sites, fertilization increased total plant nutrient ...


Herbivores Safeguard Plant Diversity By Reducing Variability In Dominance, Brent Mortensen, Brent Danielson, W. Stan Harpole, Juan Alberti, Carlos Alberto Arnillas, Lori Biederman, Elizabeth T. Borer, Marc W. Cadotte, John M. Dwyer, Nicole Hagenah, Yann Hautier, Pablo Luis Peri, Eric W. Seabloom Jan 2018

Herbivores Safeguard Plant Diversity By Reducing Variability In Dominance, Brent Mortensen, Brent Danielson, W. Stan Harpole, Juan Alberti, Carlos Alberto Arnillas, Lori Biederman, Elizabeth T. Borer, Marc W. Cadotte, John M. Dwyer, Nicole Hagenah, Yann Hautier, Pablo Luis Peri, Eric W. Seabloom

Ecology, Evolution and Organismal Biology Publications

1. Reductions in community evenness can lead to local extinctions as dominant species exclude subordinate species; however, herbivores can prevent competitive exclusion by consuming otherwise dominant plant species, thus increasing evenness. While these predictions logically result from chronic, gradual reductions in evenness, rapid, temporary pulses of dominance may also reduce species richness. Short pulses of dominance can occur as biotic or abiotic conditions temporarily favor one or a few species, manifested as increased temporal variability (the inverse of temporal stability) in community evenness. Here, we tested whether consumers help maintain plant diversity by reducing the temporal variability in community evenness ...


Life-History Constraints In Grassland Plant Species: A Growth-Defence Trade-Off Is The Norm, Eric M. Lind, Elizabeth T. Borer, Eric W. Seabloom, Peter B. Adler, Jonathan D. Bakker, Dana M. Blumenthal, Michael J. Crawley, Kendi F. Davies, Jennifer Firn, Daniel S. Gruner, W. Stanley Harpole, Yann Hautier, Helmut Hillebrand, Johannes M. H. Knops, Brett A. Melbourne, Brent D. Mortensen, Anita C. Risch, Martin Schuetz, Carly J. Stevens, Peter D. Wragg Apr 2013

Life-History Constraints In Grassland Plant Species: A Growth-Defence Trade-Off Is The Norm, Eric M. Lind, Elizabeth T. Borer, Eric W. Seabloom, Peter B. Adler, Jonathan D. Bakker, Dana M. Blumenthal, Michael J. Crawley, Kendi F. Davies, Jennifer Firn, Daniel S. Gruner, W. Stanley Harpole, Yann Hautier, Helmut Hillebrand, Johannes M. H. Knops, Brett A. Melbourne, Brent D. Mortensen, Anita C. Risch, Martin Schuetz, Carly J. Stevens, Peter D. Wragg

Ecology, Evolution and Organismal Biology Publications

Plant growth can be limited by resource acquisition and defence against consumers, leading to contrasting trade-off possibilities. The competition-defence hypothesis posits a trade-off between competitive ability and defence against enemies (e.g. herbivores and pathogens). The growth-defence hypothesis suggests that strong competitors for nutrients are also defended against enemies, at a cost to growth rate. We tested these hypotheses using observations of 706 plant populations of over 500 species before and following identical fertilisation and fencing treatments at 39 grassland sites worldwide. Strong positive covariance in species responses to both treatments provided support for a growth-defence trade-off: populations that increased ...