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   Anas platyrhynchos (oiseau) English   
Écologie Distribution Gestion Impacts Références
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         Étude de cas sur les impacts
    Australia English 
    Hybridation: Mallards hybridize with Australia native Pacific black duck (Anas superciliosa). In locations such as Lord Howe Island no pure populations of A. superciliosa remain (Tracey et al., 2008).
    India English 
    Compétition: The mallard is believed to compete with native waterfowl in India (Williams, undated).
    New Zealand English 
    Hybridation: In New Zealand, Anas platyrhynchosis is deemed to have caused severe declines in populations of the native Pacific grey duck (see Anas superciliosa in IUCN Red List of Threatened Species) through genetic introgression. As agricultural regions are now largely dominated by the introduced mallard A. superciliosa has become increasingly restricted to undeveloped areas (Rhymer et al., 1994, 2004; BirdLife International 2004).
    South Africa English 
    Hybridation: Anas platyrhynchos hybridise with native Yellow-billed duck (A. undulata) in South Africa establishing a potential threat (AEWA, 2003).
    Western Cape (South Africa) English 
    Hybridation: Anas platyrhynchos hybridise with native Yellow-billed duck (A. undulata) in West Cape, South Africa where it is considered a major problem (AEWA, 2003).
    United States (USA) English 
    Hybridation: In North America, Anas platyrhynchos hybridizes with mottled ducks (Anas fulvigula), black ducks (Anas rubripes), and Pacific black ducks (Anas superciliosa) which have experienced decline believed to be a result of this hybridization. As a consequence of hybridisation with mottled ducks, releases of mallards have been prohibited in Florida (Kulikova, 2005; Muñoz-Fuentes, 2007; Rhymer et al., 1994; Snyder, 1993).
    Hawaii (United States (USA)) English 
    Hybridation: Anas platyrhynchos threatens the endemic 'Endangered (EN)' Hawaiian Duck (see Anas wyvilliana in IUCN Red List of Threatened Species). Hybridization between the mallard and Hawaiian duck have greatly depleted pure stocks of Hawaiian ducks to the point they face extinction if it continues

ISSG Landcare Research NBII IUCN University of Auckland