Relative success of overwater and upland mallard nests in southwestern Manitoba

T. W. Arnold, M. D. Sorenson, J. J. Rotella

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35 Scopus citations


Overwater and upland Anas platyrhynchos nests were monitored in SW Manitoba. Nest success estimates were higher for overwater nests (43.9%) than for upland nests (12.2%). Overwater nests were more likely to be parasitized (primarily by redheads Aythya americana) than were upland nests (11% vs. 0% parasitized, respectively). Parasitized nests contained an average of 1.2 fewer mallard eggs and had 23% lower egg success than unparasitized nests, but these costs were not sufficient to offset the large advantage in nest success that was associated with overwater nesting. A large fraction of the local mallard population was thus nesting successfully in a habitat that is not searched during traditional nesting studies. -from Authors

Original languageEnglish (US)
Pages (from-to)578-581
Number of pages4
JournalJournal of Wildlife Management
Issue number3
StatePublished - 1993


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