Competitive impacts and responses of an invasive weed: dependencies on nitrogen and phosphorus availability

Oecologia
K N SudingT R Seastedt

Abstract

Changes in competitive interactions under conditions of enhanced resource availability could explain the invasion success of some problematic plant species. For one invader of North American grasslands, Centaurea diffusa (diffuse knapweed), we test three hypotheses: (1) under ambient (high resource) conditions, C. diffusa is better able to tolerate competition from the resident community (competitive response), (2) under ambient conditions, C. diffusa strong impacts the competitive environment (competitive effect), and (3) reductions in nitrogen and/or phosphorus availability diminish these advantages. In support of our first hypothesis, C. diffusa was the most tolerant to neighbor competition of the four focal species under current resource conditions. In opposition to our second hypothesis, however, neighborhoods that contained C. diffusa and those where C. diffusa had been selectively removed did not differ in their impact on the performance of target transplant individuals or on resource conditions. Reduction in resource availability influenced competitive tolerance but not competitive impact, in partial support of our last hypothesis. Reduction in soil nitrogen (via sucrose carbon addition) enhanced the degree of neighbor ...Continue Reading

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Citations

Apr 14, 2010·Oecologia·Laura G PerryEdward F Redente
Nov 29, 2007·The ISME Journal·Wim H van der PuttenDavid A Wardle
Oct 22, 2008·Proceedings of the National Academy of Sciences of the United States of America·Benjamin Jantzen, Thomas Eisner
Jul 22, 2011·Ecological Applications : a Publication of the Ecological Society of America·Robert J SteersEdith B Allen
Oct 28, 2008·Trends in Ecology & Evolution·Jennifer L FunkErika S Zavaleta
Oct 18, 2014·Frontiers in Plant Science·Margherita Gioria, Bruce A Osborne
Mar 9, 2018·Ecology Letters·Marina Golivets, Kimberly F Wallin
Apr 27, 2007·Nature·Jennifer L Funk, Peter M Vitousek
May 31, 2017·Frontiers in Plant Science·Tuyet T A TruongMargaret E Andrew
Jul 10, 2020·Oecologia·Wei WeiYuping Hou
Aug 7, 2021·Ecology·Anu EskelinenJennifer R Gremer

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