Estuaries and Coasts

, Volume 33, Issue 5, pp 1225–1236

Can Plant Competition and Diversity Reduce the Growth and Survival of Exotic Phragmites australis Invading a Tidal Marsh?

Article

Abstract

The rapid proliferation of Phragmites australis in North America has challenged resource managers to curb its expansion and reduce the loss of functional tidal marsh. We investigated whether native plant competition could reduce the ability of Phragmites to invade a tidal marsh, and if plant diversity (species richness, evenness, and composition) altered the competitive outcome. Immature Phragmites shoots and four native halophytes were transplanted to small but dense field plots (~1,200 shoots m−2) comprising three community structure types (Phragmites alone, Phragmites + 1 native species, and Phragmites + 4 native species). Interspecific competition significantly reduced Phragmites aboveground biomass, shoot length production, density, and survival by approximately 60%. Additionally, plots planted with greater native diversity contained Phragmites with the lowest growth and survival, potentially indicating diversity-enhanced resource competition. Competition consistently reduced the growth of Phragmites even under favorable conditions: lack of strong tidal flooding stresses as well as elevated nutrient pools.

Keywords

Biodiversity Richness Common reed Invasive species management Halophyte Salt marsh 

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Copyright information

© Coastal and Estuarine Research Federation 2010

Authors and Affiliations

  1. 1.University of New Hampshire, Jackson Estuarine LaboratoryDurhamUSA
  2. 2.Department of Natural Resources and the EnvironmentUniversity of New Hampshire, Jackson Estuarine LaboratoryDurhamUSA

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