Wetlands

, Volume 19, Issue 4, pp 733–755 | Cite as

Invasiveness in wetland plants in temperate North America

  • Susan M. Galatowitsch
  • Neil O. Anderson
  • Peter D. Ascher
Article

Abstract

The spread of invasive taxa, includingLythrum salicaria, Typha × glauca, Myriophyllum spicatum, Phalaris arundinacea, andPhragmites australis, has dramatically changed the vegetation of many wetlands of North America. Three theories have been advanced to explain the nature of plant invasiveness. Aggressive growth during geographic expansion could result because 1) growth is more favorable under new environmental conditions than those of resident locales (environmental constraints hypothesis); 2) herbivores may be absent in the new locale, resulting in selection of genotypes with improved competitive ability and reduced allocation to herbivore defenses (evolution of increased competitive ability hypothesis); and 3) interspecific hybridization occurred between a new taxon and one existing in an area, resulting in novel phenotypes with selective advantages in disturbed sites or phenotypes that can grow under conditions not favorable for either parent (introgression/hybrid speciation hypothesis). A review of published literature found few studies that compare the growth and dynamics of invasive populations in their new range versus those in historic ranges. However, there is evidence that hydrologic alterations could facilitate invasions byTypha × glauca andPhalaris arundinacea and that increased salinity promoted spread ofTypha angustifolia (parental taxon) andPhlaris arundinacea and that increased salinity promoted spread ofTypha angustifolia (parental taxon) andPhragmites australis. The potential for reduced herbivory causing aggressive growth is greatest forLythrum salicaria. Introgressive hybridization is potentially a cause of invasiveness for all five species but has been established only forTypha × glauca andLythrum salicaria.

Key Words

Lythrum salicaria Typha × glauca Myriophyllum spicatum Phalaris arundinacea Phragmites australis exotic species invasion hybridization herbivory environmental constraints introgression 

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Copyright information

© Society of Wetland Scientists 1999

Authors and Affiliations

  • Susan M. Galatowitsch
    • 1
  • Neil O. Anderson
    • 1
  • Peter D. Ascher
    • 1
  1. 1.Department of Horticultural ScienceUniversity of MinnesotaSt. PaulUSA

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