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American Black Duck Anas rubripes and Mallard A. platyrhynchos abundance, occurrence of heterospecific pairing and wetland use between 1976 and 2003 in Northeastern Nova Scotia, Canada

Norman R. Seymour, Auteur ; Sean C. Mitchell, Auteur

Dans Wildfowl (56 2006)

Mallard Anas platyrhynchos abundance has increased in eastern North America with a concomitant decline in the number of Black Duck A. rubripes in some parts of their range. It has been speculated that introgressive hybridisation or competitive e[...]

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