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Recent Topics Posters

Frevola, Danielle [1], Hovick, Steve [2].

Decoupling the effects of nutrient enrichment and nutrient pulses on a ubiquitous wetland invader and its native conspecific taxon: plasticity and mean trait responses.

Systems surrounded by anthropogenic land use, such as agriculture and urbanization, are likely to be exposed to elevated nutrient levels and temporally variable nutrient deliveries because of disturbances associated with these land use types. Wetlands, in particular, are highly susceptible to anthropogenic nutrient regimes because of their low-lying position on the landscape. The consequences of nutrient pulses in wetlands are largely unexplored, but disentangling the impacts of nutrient enrichment and pulses is important to better understand how plant communities respond to anthropogenic disturbances. Elevated nutrient enrichment and heterogeneous nutrient delivery rates may increase invasion potential because invasive species may respond more favorably to anthropogenic nutrient regimes. To explore the impacts of nutrient enrichment and nutrient delivery rate on invasion success, we established a common garden experiment using Phragmites australis, an aggressive wetland invader in North America and its native conspecific, Phragmites australis subsp. americanus. We independently manipulated nutrient enrichment and nutrient delivery rates to examine productivity and plasticity responses of Phragmites. Total productivity and biomass allocation differed between the two taxa. Invasive Phragmites had 73% greater total biomass and 66% more culms; however, native Phragmites was 32% taller.  Additionally, nutrient enrichment, rather than nutrient pulses, led to greater productivity responses, suggesting nutrient enrichment may be more important for Phragmites success. We also observed strong plasticity responses to nutrient enrichment, but plasticity responses differed between native and invasive Phragmites. Invasive Phragmites had 82% greater biomass plasticity in response to nutrient enrichment, which may explain why the taxon is able to establish across novel and variable environments. Our results suggest that native Phragmites may outperform the invasive taxon under certain conditions. We further suggest that wetlands susceptible to high concentrations of pollutants, rather than nutrient pulses, should be prioritized for management since these conditions may most strongly enhance invasion success for Phragmites.


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1 - The Ohio State University, Evolution, Ecology, and Organismal Biology, 318 W 12 Ave, Columbus, OHIO, 43210, USA
2 - The Ohio State University, Dept. Of Evolution, Ecology & Organismal Biology, 318 W. 12th Avenue, 300 Aronoff Laboratory, 318 W. 12th Avenue, Columbus, OH, 43210, United States

Keywords:
Phragmites australis
Wetland
Biological invasion
phenotypic plasticity
Nutrient pulses
Anthropogenic land use.

Presentation Type: Recent Topics Poster
Session: P, Recent Topics Posters
Location: Grand Ballroom - Exhibit Hall/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 5:30 PM
Number: PRT026
Abstract ID:1321
Candidate for Awards:None


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