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Breeding Biology and Parasitism in the Ruddy Duck

W. Roy Siegfried
The Wilson Bulletin
Vol. 88, No. 4 (Dec., 1976), pp. 566-574
Stable URL: http://www.jstor.org/stable/4160826
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Breeding Biology and Parasitism in the Ruddy Duck
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Abstract

The breeding phenology of the Ruddy Duck (Oxyura jamaicensis) in Manitoba, Canada, is described. Most females began nesting about 4 weeks after their arrival on the breeding grounds. The delay in onset of nesting may be correlated with the availability of suitable cover. The incidence of interspecific nest parasitism by the Ruddy Duck was low. A relationship is indicated between degree of parasitism and the chronology of nesting concomitant with the quantity and quality of available nesting cover. Parasitic laying apparently results from a lack of attunement of a female's physiological and behavioral responses to environmental cues.

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