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Showing 1 to 20 of 125 for “"broods"”.
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Cover Use and Activity Time Budget of Blue-Winged Teal, Mallard, and Pintail Broods
… (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 evaluated by species and brood age-class. …
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Habitat Preferences and Censusing of Waterfowl Broods On Stock Ponds In South Central South Dakota
Waterfowl broods on stock ponds in south central South Dakota were surveyed in 1977 and 1978 to compare flush and observation techniques for censusing broods and to determine waterfowl brood habitat preferences. Results indicated that 72-8% of the broods present were censused by either technique …
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Survival, Movements, and Habitat Use of Mallard Broods Produced on Overwater Nesting Structures in Eastern South Dakota
… and habitat use of mallard (Anas platyrhynchos) broods produced from overwater nesting structures in eastern South Dakota were evaluated during spring and summer 1998-99. Two study sites with overwater nesting structures were chosen in 1998, representing a large semipermanent marsh (Mickelson) …
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Movements, Survival, and Habitat Use of Mallard Broods Hatched from Predator Reduced Nesting Habitats in Eastern South Dakota
… movements of mallard (Anas platyrhynchos) broods from nest site to brood rearing wetlands, and thereafter; to determine survival of broods hatched from SUMP areas; to determine general habitat characteristics of brood rearing wetlands. Three types of SUMP areas were used as study sites …
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Nesting and Brood-Rearing Habitat Selection of Greater Sage-Grouse and Associated Survival of Hens and Broods at the Edge of Their Historic Distribution
… were monitored to determine nest fate and broods were monitored by tracking radio-marked adults that successfully hatched young. Habitat selection was characterized by comparing vegetation at nest-sites and brood-sites to vegetation points at randomly selected sites. I found 34 nests from …
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Brood-rearing Period Cover Use By Wild Turkey Hens in Southcentral South Dakota
… by wild turkey (Meleagris gallopavo) hens with broods and those without, in Gregory County, South Dakota, was determined in order to formulate management suggestions for grassland/riparian woodland habitat. Two hens with broods and 12 hens without broods were studies through telemetry and direct …
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Possible Role Of Breeding Phenology, Brood Size, And Male Parental Care On The Number Of Nesting Attempts By Female Eastern Bluebirds, A Facultatively Multibrooded Species
… of songbirds attempt to raise two or more broods in a single breeding season. The results of previous studies have revealed much variation among species in the factors that influence the likelihood of female songbirds attempting to raise multiple broods during a breeding season. As such, …
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Effects of Variation in Hunger Levels on Begging Behavior of Nestlings and the Provsioning Behavior of Male and Female Eastern Phoebes
… by brood number (i.e., first versus second broods). </p> <p>To examine these parent-offspring interactions, I first manipulated hunger levels of whole broods of nestling Eastern Phoebes (<em>Sayornis phoebe</em>) during the 2011 breeding season at the Blue Grass Army Depot in Madison Co., …
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Movements and Habitats of Brood-Rearing Wood Ducks On A Prairie River
… before nest exodus. In 1979, no wood duck broods were found on 43 upland wetlands located within 0.8 km of the river, 0.46 broods/km were seen on oxbows, and 0.05 broods/km and 1.67 broods/km were seen on the river. In 1980 and 1981, respectively, 0.63 broods/km and 1.67 broods/km were seen …
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Factors Affecting Waterfowl Brood Use of Stock Ponds in South Dakota
… and pond size were important in determining if broods of any particular species utilized a pond or not. Shoreline distance was particularly important in explaining variation in brood densities. Highest brood densities occurred on stock ponds of 0.40 to 1.00 ha surface-water area. Blue-winged …
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Ultraviolet reflectance of nestling plumage and the provisioning strategies of adult Eastern Phoebes (Sayornis phoebe)
… videorecording. I conducted experiments with 25 broods of Eastern Phoebes at the Blue Grass Army Depot in Madison County, Kentucky, in 2010, including 13 first broods and 12 second broods. Control and UV-blocked nestlings were fed at similar rates (P = 0.72) by male and female Eastern Phoebes, …
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Waterfowl Breeding Pair and Brood Usage of Oxbows and Riverine Habitats on the James River
… (1.2 pairs/km). River segments averaged 1.0 broods/km in 1987 with blue-winged teal the most corrmon (0.4 broods/km). No broods were located on the river segments in 1988. Oxbows averaged 1. 7 and 0. 8 broods/km in 1987 and 1988 respectively with wood duck (Aix sponsa) broods the most common …
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An Evaluation of Waterfowl Production Surveys in Eastern South Dakota, 1995
… after the production survey. During this study, broods and Late Nesting Index (LNI) adults were counted from the ground and air. The LNI is composed of lone drakes in breeding plumage and duck pairs and is used to predict the relative number of broods that hatch after the production survey is …
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Effect of nestling sex ratio on the provisioning behavior of adult Eastern Bluebirds (Sialia sialis)
… adult provisioning behavior. Among experimental broods, the provisioning rates of male and female Eastern Bluebirds were not affected by brood sex ratio (P = 0.58). Similarly, for broods that naturally differed in the number of male and female nestlings (N = 9), I found no effect of brood sex …
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Productivity, Movements, and Habitat Use of Nesting and Brooding Wild Turkey Hens in Gregory County, South Dakota
… Seventeen of 39 (43.6%) clutches hatched, and 11 broods survived to mid-August. Poult survival in 1986 was 42.9%, with all poult mortality occurring during the first 2 weeks post-hatch. Accurate data for poult survival was not obtainable during 1987, but survival appeared to be similar to 1986. …
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Reproductive Success and Brood Habitat Use of Greater Prairie Chickens and Sharp-Tailed Grouse on the Fort Pierre National Grassland of Central South Dakota
… 62 PC and 38 ST hens and 26 PC and 21 ST broods on the FPNG during the breeding seasons of late March – August of 2003 – 2005. Habitat use was determined from 18 PC and 17 ST broods during 2004 and 2005. Overall nest success for PC was 0.80 (n = 50) and 0.72 (n = 36) for ST from 2003 – …
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Broad reduction and adoption in ring-billed gulls (Larus Delaworensis): the potential for inergenerational conflict
… insurance reproductive value. Experimental broods (1988) were created in which hatch intervals were double those of natural intervals. The size disparities among chicks were significantly greater than in control broods, and the pattern of mortality among chicks suggested that first chicks …
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Reproductive Decisions in American Robins (Turdus Migratorius): Relationships Among Paternity Allocation, Parental Care, Plumage Variation, and Mate Choice
… particularly in species with overlapping broods. In my dissertation, I addressed the reproductive consequences of behavioral interactions between males and females over multiple breeding attempts, specifically by examining how these interactions affect mate-guarding opportunity, extra-pair …
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Environmental Effects on the Reproductive Ecology of a Passerine Bird
… proportion of feeding to male- and female-biased broods, but contributed slightly more to foraging for male-biased broods. A productive environment with relatively high nest predation rates may prevent males from decreasing their parental investment in the current brood.
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Sibling rivalry in black-legged kittiwakes (Rissa tridactyla)
… were made between experimental and control broods in which all the natural asymmetries were present. Differences in egg size determined which chick became dominant but these differences did not change the brood behaviour. Furthermore, experimental broods showed very different behaviour from …
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