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Distribution and abundance of Minnesota-breeding Ring-necked Ducks Aythya collaris

Michael C. Zicus, Auteur ; David P. Rave, Auteur ; John R. Fieberg, Auteur ; John H. Giudice, Auteur ; Robert G. Wright, Auteur

Dans Wildfowl (58 2008)

Concerns about Ring-necked Duck Aythya collaris breeding numbers in Minnesota suggested a population survey was needed; however, knowledge of the species' distribution and abundance was poor. Existing waterfowl survey data were used to define an[...]

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