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Full-Text Articles in Social and Behavioral Sciences
Western Meadowlark Impaled On Barbed-Wire Fence, Lawrence D. Igl
Western Meadowlark Impaled On Barbed-Wire Fence, Lawrence D. Igl
USGS Northern Prairie Wildlife Research Center
Recently, Allen and Ramirez (1990, Wilson Bull. 102:553-558) summarized known observations of bird mortality associated with barbed-wire fences. Most reported cases of bird mortality from barbed-wire fences were of non-passerine birds. On 16 June 1993 in Slope County in western North Dakota (NW 1/4, Sec. 10 T134N R103W), I found a dead western meadowlark (Sturnella neglecta) with its right wing impaled by a barb on the middle strand of a three-strand barbed-wire fence. Barbs on the wire were spaced about 12-15 cm apart. The bird was adult-sized, but plumage characteristics indicated that it was a young-of-the-year with well-developed …
Survival Of Radiomarked Canvasback Ducklings In Northwestern Minnesota, Carl E. Korschgen, Kevin P. Kenow, William L. Green, Douglas H. Johnson, Michael D. Samuel, Louis Sileo
Survival Of Radiomarked Canvasback Ducklings In Northwestern Minnesota, Carl E. Korschgen, Kevin P. Kenow, William L. Green, Douglas H. Johnson, Michael D. Samuel, Louis Sileo
USGS Northern Prairie Wildlife Research Center
Duckling survival, an important factor affecting annual recruitment, has not been determined adequately for canvasbacks (Aythya valisineria). We investigated the magnitude, timing, and causes of mortality of canvasback ducklings from hatch to fledging at the Agassiz National Wildlife Refuge (NWR) in northwestern Minnesota during 1987-90. During the 4 years, 217 day-old ducklings were radiomarked and released in 52 broods. Another 141 ducklings were radiomarked at > 4 weeks of age. Survival was estimated with the Kaplan-Meier nonparametric estimator and the Weibull parametric model. Most mortalities occurred within 10 days after hatch. Total brood loss occurred in 18 (35%) of …
Second Record Of White Ibis In North Dakota, Jennifer W. Marlow, Lawrence D. Igl, Melody R. Hartman
Second Record Of White Ibis In North Dakota, Jennifer W. Marlow, Lawrence D. Igl, Melody R. Hartman
USGS Northern Prairie Wildlife Research Center
The breeding range of the white ibis (Eudocimus albus) in the United States is generally restricted to coastal regions along the Gulf of Mexico and the Atlantic Ocean north to Virginia (Frederick et al. 1996, Conserv. BioI. 10:203-216). During the breeding season, the white ibis is nomadic and highly opportunistic in its use of unpredictable food resources (Frederick et al. 1996; Bildstein 1993, White ibis: wetland wanderer. Smithsonian Inst. Press, Washington, D.C.). There is one previous record of a white ibis in North Dakota on 4 August 1954 (Gammell and Huenecke 1955, Audubon Field Notes 9:34-36; Lokemoen 1979, …
Long-Term Declines In Nest Success Of Prairie Ducks, Wendy D. Beauchamp, Rolf R. Koford, Thomas D. Nudds, Robert G. Clark, Douglas H. Johnson
Long-Term Declines In Nest Success Of Prairie Ducks, Wendy D. Beauchamp, Rolf R. Koford, Thomas D. Nudds, Robert G. Clark, Douglas H. Johnson
USGS Northern Prairie Wildlife Research Center
Increased predation on nests of ducks in prairie uplands, as a result of habitat alteration, has been hypothesized to cause decreased nest success and population sizes. We tested whether, and by how much, nest success declined using data compiled from 37 studies conducted between 1935 and 1992 at 67 sites in the Prairie Pothole Region of Canada and the United States. Nest success declined (P = 0.0002) over time, but time explained only 10% of the variation; precipitation (P = 0.79) did not account for additional variation in nest success. Nest success declined at similar (P = 0.13) rates among …