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Full-Text Articles in Social and Behavioral Sciences
Nest Parasitism On Constructed Islands In Northwestern North Dakota, Amy L. Zimmerman, Marsha A. Sovada, Tim K. Kessler, Robert K. Murphy
Nest Parasitism On Constructed Islands In Northwestern North Dakota, Amy L. Zimmerman, Marsha A. Sovada, Tim K. Kessler, Robert K. Murphy
USGS Northern Prairie Wildlife Research Center
Parasitism of duck nests can reduce host productivity. We examined effects of nest parasitism on success of host nests found on constructed islands in the Fuller-Big Meadows marsh in northwestern North Dakota from 1994 to 2000. We found 1642 duck nests of 10 species on 25 0.3-ha islands. Nine hundred- seventy (59%) of the 1642 nests were parasitized, of which 87% were parasitized by redheads (Aythya americana). The observed parasitism rate was greater than 50% in four of seven years and was highest in 1997 (81 %, n = 252). Mallard (Anas platyrhynchos) nests tended to …
Mallard Duckling Growth And Survival In Relation To Aquatic Invertebrates, Robert R. Cox, Mark A. Hanson, Christianne C. Roy, Ned H. Euliss Jr., Douglas H. Johnson, Malcolm G. Butler
Mallard Duckling Growth And Survival In Relation To Aquatic Invertebrates, Robert R. Cox, Mark A. Hanson, Christianne C. Roy, Ned H. Euliss Jr., Douglas H. Johnson, Malcolm G. Butler
USGS Northern Prairie Wildlife Research Center
Identification and assessment of the relative importance of factors affecting duckling growth and survival are essential for effective management of mallards on breeding areas. For each of 3 years (1993-95), we placed Fl-generation wild mallard (Anas platyrhynchos) females on experimental wetlands and allowed them to mate, nest, and rear broods for 17 days. We manipulated invertebrate densities by introducing fathead minnows (Pimephales promelas) at high densities in half of the wetlands on which broods were confined. Day- 17 body mass of surviving ducklings (n = 183) was greater for ducklings that were heavier at hatch; the …