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Nutrient addition shifts plant community composition towards earlier flowering species in some prairie ecoregions in the U.S. Central Plains
PloS ONE
  • Lori A. Biederman, Iowa State University
  • Brent Mortensen, Iowa State University
  • Philip Fay, U.S. Department of Agriculture
  • Nicole Hagenah, University of KwaZulu-Natal
  • Johannes Knops, University of Nebraska - Lincoln
  • Kimberly La Pierre, University of California - Berkeley
  • Ramesh Laungani, Doane University
  • Eric Lind, University of Minnesota - Twin Cities
  • Rebecca McCulley, University of Kentucky
  • Sally Power, Western Sydney University
  • Eric Seabloom, University of Minnesota - Twin Cities
  • Pedro Tognetti, Universidad de Buenos Aires
Document Type
Article
Publication Version
Published Version
Publication Date
5-26-2017
DOI
10.1371/journal.pone.0178440
Abstract

The distribution of flowering across the growing season is governed by each species’ evolutionary history and climatic variability. However, global change factors, such as eutrophication and invasion, can alter plant community composition and thus change the distribution of flowering across the growing season. We examined three ecoregions (tall-, mixed, and short-grass prairie) across the U.S. Central Plains to determine how nutrient (nitrogen (N), phosphorus, and potassium (+micronutrient)) addition alters the temporal patterns of plant flowering traits. We calculated total community flowering potential (FP) by distributing peak-season plant cover values across the growing season, allocating each species’ cover to only those months in which it typically flowers. We also generated separate FP profiles for exotic and native species and functional group. We compared the ability of the added nutrients to shift the distribution of these FP profiles (total and sub-groups) across the growing season. In all ecoregions, N increased the relative cover of both exotic species and C3graminoids that flower in May through August. The cover of C4 graminoids decreased with added N, but the response varied by ecoregion and month. However, these functional changes only aggregated to shift the entire community’s FP profile in the tall-grass prairie, where the relative cover of plants expected to flower in May and June increased and those that flower in September and October decreased with added N. The relatively low native cover in May and June may leave this ecoregion vulnerable to disturbance-induced invasion by exotic species that occupy this temporal niche. There was no change in the FP profile of the mixed and short-grass prairies with N addition as increased abundance of exotic species and C3 graminoids replaced other species that flower at the same time. In these communities a disturbance other than nutrient addition may be required to disrupt phenological patterns.

Comments

This article is published as Biederman L, Mortensen B, Fay P, Hagenah N, Knops J, La Pierre K, et al. (2017) Nutrient addition shifts plant community composition towards earlier flowering species in some prairie ecoregions in the U.S. Central Plains. PLoS ONE 12(5): e0178440. doi: 10.1371/journal.pone.0178440.

Rights
This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication.
Language
en
File Format
application/pdf
Citation Information
Lori A. Biederman, Brent Mortensen, Philip Fay, Nicole Hagenah, et al.. "Nutrient addition shifts plant community composition towards earlier flowering species in some prairie ecoregions in the U.S. Central Plains" PloS ONE Vol. 12 Iss. 5 (2017) p. e0178440
Available at: http://works.bepress.com/lori_biederman/17/