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Showing 1 to 20 of 26 for “"blue-winged teal"”.
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Ecological Relationships of Breeding Blue-winged Teal to Prairie Potholes
<p>Ecology and behavior of breeding blue-winged teal (Anas discors) were studied in northeastern Day County, South Dakota in 1965 and 1966. Breeding pair use of the wetland habitat and importance of Type 1 ponds in the wetland complex were evaluated. Pair densities of 30.7 and 33.0 per square mile …
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Energy Requirements of Blue-Winged Teal Under Free-Living and Captive Conditions
Made available in DSpace on 2014-12-10T18:13:39Z (GMT). No. of bitstreams: 1 6901403.pdf: 2033975 bytes, checksum: c05746ffa507da37cfc46311818dbe7f (MD5) Previous issue date: 1968
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Cover Use and Activity Time Budget of Blue-Winged Teal, Mallard, and Pintail Broods
Blue-winged teal (Anas discors), mallard (A. platyrhynchos), and pintail (A. acuta) broods were observed on 17 days between 25 June and 30 July, 1976. Brood activities and cover uses were recorded continuously from first light until dark. Observations of 269 broods from three wetlands were …
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Investigating factors influencing blue-winged teal movements and habitat selection during the nonbreeding season
… we used data from individual GPS/GSM-tracked blue-winged teal (Spatula discors) to evaluate the environmental drivers of autumn and spring migration phenology during 2020 -- 2023 (n = 321 migratory movements) at a continental scale. We modeled departure probabilities of blue-winged teal using …
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An Evaluation of the Roadside Technique for Censusing Breeding Waterfowl
… mean with specified confidence of 0.90 for blue-winged teal (Anas discors) and gadwall (Anas strepera) was five and three using miles or wetlands. Within same limits counts needed for mallard (Anas platyrhynchos) were at least four for miles and three for wetlands. Shorter transects, used in …
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Use of Waterfowl Production Areas by Ducks and Coots in Eastern South Dakota
… dabbler ducks were made on four WPAs in 1971 and blue-winged teal (Anas discors), mallard (Anas platyrhynchos), and gadwall (Anas strepera) were found to be the most abundant. On the Eriksrud area, the most common nesting ducks were blue-winged teal and canvasback (Aythya valisineria), eight nests …
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Effects of Two Haying Provisions on Duck Nesting in Conservation Reserve Program (CRP) Fields in South Dakota
… nests in hayed strips were primarily of blue-winged teal (Anas discors). In 1990 mean visual obstruction readings of residual and peak green growth vegetation were significantly greater (P50.05) in idled blocks than hayed blocks. Nest densities in idled and hayed blocks were similar …
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Variables Associated With Breeding Waterfowl On South Dakota Stock Ponds
… variation in mallard (Anas Platyrhmchos) and blue-winged teal (A. discors) pairs than any other single variable. Ponds used by these pairs and shoreline distances that averaged 590 m which was significantly (P<0.005) greater than the mean shoreline distances of ponds not used (X=270 m). …
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Waterfowl Breeding Pair and Brood Usage of Oxbows and Riverine Habitats on the James River
… pairs/km in 1988 on the river segments. In 1987, blue-winged teal (Anas discors) pairs located on river segments were the most corrmon (2.5 pairs /km) species; pair surveys were not conducted on oxbows in 1987. In 1988, mallard (Anas olatvrhynchos) pairs located on oxbows were the most corrrnon …
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Breeding Waterfowl Use of Intermittent Streams, McHenry County, North Dakota
… for the first census of each year. Accepting blue-winged teal (A. discors), numbers of dabbler pairs were similar in 1976 and 1978. Dry conditions in 1977 caused lower numbers of all species of dabblers except gadwalls (A. strepera). Most pothole wetlands in the immediate area were wet in 1976 …
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Influence of Habitat Characteristics on Wetland Bird Abundance and Species Richness at Ordway Prairie, South Dakota
… breeding habitat. The most common species were blue-winged teal (Anus discors), gadwall (A. strepera), and mallard (A. platyrhynchos). Killdeer (Charadrius vociferus) and Wilson’s phalarope (Phalaropus tricolor) were the most common breeding shorebirds. Lesser yellowlegs (Tringa flavipes) were …
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Response By Upland Nesting Birds to Three Rejuvenation Treatments Applied to Two Types of Seeded Nesting Cover in Eastern South Dakota
… (31). Haying of seeded nesting cover enhanced blue-winged teal production in tame grass cover and dense nesting cover. Other duck species nested at lower densities in treated cover than in Controls during the first nesting season (1987) after treatment but differences were generally not …
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Landscape Characteristics Affecting Habitat Use and Productivity of Avifauna on Stock Ponds in Western South Dakota
… class stock ponds the most common being mallard, blue-winged teal, and gadwall. Overall productivity was 50 broods/ 1 00 pairs for both landscapes with data combined for mallards, blue-winged teal and gadwalls. Waterfowl productivity was higher in fragmented landscapes (58 broods/100 pairs) than …
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Nesting Chronology of South Dakota Ducks
… (A. valisineria) were intermediate nesters while blue-winged teal (Anas discors), gadwalls (A. strepera), and American wigeons (A. americana) were late nesters. Mallards and pintails initiated nests over the longest periods of time. Variables associated with wetland habitat, temperature, and …
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Wildlife Habitat in the James River Valley, South Dakota
… other. Waterfowl breeding pairs, mostly mallard, blue-winged teal, and wood duck, numbered 244 in 1974 and 638 in 1975, a record flood year. Counts on bird census routes showed 138 species of birds using them, with the majority being summer residents in the woodlands. Other observations showed …
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Factors Affecting Waterfowl Brood Use of Stock Ponds in South Dakota
… ponds of 0.40 to 1.00 ha surface-water area. Blue-winged teal (Anas discors) broods were positively associated with alfalfa and negatively associated with total stream area on the study plot. Mallard (Anas platyrhynchos) broods were negatively associated with pasture and hayland. Pintail (Anas …
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Factors Influencing Habitat Use By Breeding Waterfowl in South Dakota
… (Anas platyrhynchos), pintails (Anas acuta), blue-winged teal (Anas discors), and gadwall (Anas strepera). Coefficient of determination for these species were greatest in the central Coteau des Prairies, the James River Valley, and the Coteau du Missouri. Hectares of surface water and hectares …
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Breeding Waterfowl Populations in South Dakota
… conditions throughout South Dakota in 1974. Blue-winged teal (Anas discors), mallard (Anas platyrhynchos), pintail (Anas acuta), and gadwall (Anas strepera) were, in that order, the most abundant species. Diving ducks constituted less than 5 percent of the population each year. Highest diving …
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Migrant Shorebird, Breeding Waterfowl, and Invertebrate Reponse to Conditions in Temporary Wetlands in Easter Central South Dakota During Spring
… temporary wetlands, but only four were abundant (blue-winged teal, mallard, northern shoveler, and northern pintail). The abundance of shorebirds and waterfowl among cover types (tilled no vegetation, tilled vegetation present, untilled with cattle, untilled no cattle) varied between years. …
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FORAGING BEHAVIOR OF DUCKS DURING SPRING MIGRATION IN THE WABASH RIVER REGION, ILLINOIS
… proportion of time mallard (Anas platyrhynchos), blue-winged teal (Anas discors), wood duck (Aix sponsa), ring-necked duck (Aythya collaris), and lesser scaup (Aythya affinis) devoted to feeding, identify the specific behaviors used, and estimate feeding stint lengths and frequencies. I used these …
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