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Waterfowl Production on Stock-Watering Ponds in the Northern Plains
Highlight: In a .5-year study of stock-watering ponds in western North Dakota, pond size was found to be the major factor influencing duck use. As pond size increased, total pair and brood use perExpand
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Ferruginous hawk nesting ecology and raptor populations in northern South Dakota
Studies of raptors have increased recently because some species have shown serious population declines (Ratcliffe 1967, Hickey 1969). Information on population dynamics and breeding biology ofExpand
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Weights of wild Mallard Anas platyrhynchos, Gadwall A. strepera, and Blue-winged Teal A. discors during the breeding season
During 1976-81 we weighed several thousands of wild Mallard, Gadwall, and Blue-winged Teal in central North Dakota to examine duckling growth patterns, adult weights, and the factors influencingExpand
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Assessment of nasal marker materials and designs used on dabbling ducks
Four examples illustrate the relative performance of the shortcut estimator (Table 1). If the maximum-likelihood estimate provides the standard against which the others are judged, we see that theExpand
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Upland Nesting of American Bitterns, Marsh Hawks, and Short-Eared Owls
Nests of American bitterns lentiginosus) marsh hawks (Circus cyaneus), and short-eared owls (Asio u ually found in wetland habitats. Although large marshes containing dense stands of bulrushesExpand
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Bird use and nesting in conventional, minimum-tillage, and organic cropland
We examined seasonal bird use and nesting activity in fallow, sunflower, and wheat fields among conventional farms (using fall and spring tillage and pesticides), minimum-tillage farms (using reducedExpand
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A Decoy Trap for Breeding-Season Mallards in North Dakota
A modified decoy trap was effective for capturing wild adult male and female mallards (Anas platyrhynchos) during the 1980-81 breeding seasons in North Dakota. Key features contributing to the trap'sExpand
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Construction and operation of cable-chain drag for nest searches
A 1 i s t of mater ia ls necessary t o b u i l d and use a 53-m-long cable-chain drag i s presented. Techniques are described f o r searching, f ind ing, and marking nests i n a t yp i ca l area o fExpand
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