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   Lythrum salicaria (plante aquatique, herbacée) English     
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         Étude de cas sur les impacts
    Canada English 
    Compétition: The formation of dense stands of purple loosestrife results in the loss of wetland habitat for the establishment and spread of native aquatic vegetation. In some sites purple loosestrife is a threat to species designated nationally at risk by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC). This is the case with swamp rose mallow, (see Hibiscus moscheutos Species at Risk), a species designated as vulnerable by COSEWIC.

    Économique/Subsistance: The spread of purple loosestrife also has a direct economic impact when plants clog irrigation or drainage ditches on farmlands or cause degradation and loss of forage value of lowland pastures.

    Modification du cycle des nutriments: The proliferation of purple loosestrife in wetlands also changes the composition and cover values of plants that may serve as food sources for waterfowl and furbearers or as habitat for other aquatic life.
    United States (USA) English 
    Altération d'habitat: Lythrum salicaria reduces habitat suitability for specialized wetland bird species of the United States such as black terns, least bitterns, pied-billed grebes, and marsh wrens (Blossey et al, 2001).

    Autre: The high tannin concentrations of L. salicaria leaves are believed to have the potential to create environments that are directly toxic to B. americanus tadpoles. It is hypothesized that obligate gill breathers such as B. americanus tadpoles are highly sensitive to gill damage caused by high concentrations of phenolics (Maerz et al, 2005).

    Modification du cycle des nutriments: In North American freshwater wetlands, Lythrum salicaria alters decomposition rates and nutrient cycling, water chemistry (Blossey et al, 2001).

    Réduction de la biodiversité indigène: Lythrum salicaria reduced wetland biodiversity by displacing native plants, altering habitats, and changing ecological communities (Blossey et al, 2001). L. salicaria reduces pollination and seed output of the native Lythrum alatum (Blossey et al, 2001).
    Oregon (United States (USA)) English 
    Compétition: A study in several wetland locations of Oregon found Lythrum salicaria to exponentially decrease the abundance of native plants species, but there was not a significant pattern of decrease in diversity of native plants (Schooler et al, 2006).



ISSG Landcare Research NBII IUCN University of Auckland