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Showing 1 to 20 of 90 for “"Nestlings"”.
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The Growth of Mourning Dove Nestlings in Eastern Nebraska
… breeding season, and (4) the year in which the nestlings were raised (1966 or 1968). These would stress the role of physical factors associated with a particular geographic location, and the fact that they effect growth either through the parent (as regards parental care) or directly on the …
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Measuring the exposure of Songbird Nestlings to Neonicotinoids in Natural and Agricultural Nest Sites
… the presence of IMI in Savannah Sparrow (SAVS) nestlings and their insect food supply at agricultural and non-agricultural nests. Using urine samples from Tree Swallows (TRES) dosed with IMI, an HP LC-MS was used to determine the concentration of IMI its metabolite 6-chloronicotinic acid (6-CN) …
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Incubation temperature impacts growth, physiology and survival in nestlings of an open-cup nesting passerine
… °C, 37.8 °C, and Naturally incubated. Hatched nestlings from the experimental categories were fostered to same-age nests and monitored throughout the nestling period to determine fate. On days 7 and 10 post-hatch, I measured mass and tarsus length and collected blood samples from experimentally …
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Vocal responses of adult Eastern Bluebirds (Sialia sialis) to potential nest predators and the behavioral responses of nestlings
… are functionally referential and may provide nestlings with information about the threat posed by potential predators. However, few investigators have examined the responses of nestlings in cavity nests to the anti-predator vocalizations of adults. Therefore, the objectives of my study of …
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Effect of variation in nestling hunger levels on the begging behavior of nestlings and the provisioning behavior of adult American Kestrels
… nestling hunger levels, 12 to 26-day-old nestlings in six nests were deprived of food for 24 hours and those in the other six nests were fed until satiated. At each nest, I alternated control (no treatment) and treatment (fed or food-deprived) days (control, treatment, control, and …
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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
… treatments: (1) hand-feeding to satiation all nestlings in a brood (fed treatment, N = 12), (2) depriving all nestlings of food (deprived treatment, N = 16), and (3) feeding some nestlings in a brood and depriving the others (some deprived/some fed treatment, N = 14). Nestling begging and adult …
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Facultative adjustment of pre-fledging mass recession by nestling Chimney Swifts (Chaetura pelagica)
… by Chimney Swift <em>(Chaetura pelagica)</em> nestlings is intrinsically controlled or facultatively adjusted by nestlings, and if mass recession is driven by changes in parental behavior (i.e., reduced provisioning rates) or nestling behavior (i.e., reduced solicitation of feedings). Nestling …
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Determinants and Developmental Consequences of Organic Contaminant Uptake in Nestling Insectivorous Birds
… and their metabolites on wildlife with passerine nestlings as model organisms. For organisms at higher trophic levels, especially terrestrial ones the major route of exposure to persistent pollutants is food. Consequently, I estimated the diet of nestlings of populations of three species - tree …
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Effect of nestling sex ratio on the provisioning behavior of adult Eastern Bluebirds (Sialia sialis)
… differed in the number of male and female nestlings (N = 9), I found no effect of brood sex ratio on provisioning rates (P = 0.34). </p> <p>Female bluebirds provisioned nestlings at higher rates than males (P = 0.0046) and the provisioning rates of adult bluebirds varied with brood size (P …
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Perceived Predation Risk And The Responses Of Adult And Nestling Tree Swallows (tachycineta Bicolor)
… are functionally referential and provide their nestlings with information about the level of threat predators may pose. Although several investigators have examined the responses of nestlings of species with open-cup nests to the anti-predator calls of adults, few have conducted such studies …
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Variation in mass and wing loading of nestling American Kestrels: possible effects of nestling behavior and adult provisioning behavior
… (i.e. aerial insectivores), it is important that nestlings not gain excess weight. Nestlings in some species must attain an efficient wing loading just prior to fledging to facilitate mobility for hunting and evading predators. My objective was to examine the mass of nestling American Kestrels …
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Friends or foes? Blood parasite costs and defence abilities in young raptor hosts
… raptor, the common buzzard (Buteo buteo), nestlings infected with the blood parasite Leucocytozoon toddi display low transcriptional response to increasing parasitemia (density of parasite per host cells), moderate signs of parasite-induced tissue damages in the blood, disease symptoms only …
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Urbanization affects environmental conditions for developing songbirds
… can additionally restrict food intake for urban nestlings. However, this prior work has also found that urban song sparrow adults avoid consequences for living in urban habitats, so I wanted to see if nestlings were also able to avoid the consequences of urban living. In chapter one, I found our …
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Family Conflicts over Parental Care in the Blue Tit, Cyanistes caerleus.
… through the nestling period investigates how nestlings solicit parental care through begging, and the food allocation rules of male and female parents. Nestling begging was found to relate to short-term hunger, but contrary to expectation, small nestlings did not beg more than their larger …
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Great Blue Heron Nesting Biology and Habitat Use On the James River in South Dakota
… in 1980 and 1981. Mean brood size was 3.35 nestlings. The predicted number of feeding trips of adult birds peaked when nestlings were 29 days old. A significant amount of variance in adult feeding trips per hour was accounted for by southerly winds and the time period from 1800-2100 hours. …
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Impact of Reconstructed Wetlands on the Tree Swallow (Tachycineta bicolor)
Tree swallow (Tachycineta bicolor) nestlings were used as a sentinel species to evaluate the bioavailability and effect of contaminants to terrestrial life at reconstructed wetlands, Kingman Lake and Kenilworth Marsh, on the Anacostia River. Nesting success, survival, growth and developmental …
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Biologia reprodutiva de Formicivora erythronotos (Aves: Thamnophilidae)
… as to foraging strategies. Black-hooded Antwren nestlings get heavy faster than nestlings of other species in the family, which may result from the greater feeding rate of the former. The adaptive importance of this accelerated growing is not clear. An "adaptively organized" development, typical …
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Ultraviolet reflectance of nestling plumage and the provisioning strategies of adult Eastern Phoebes (Sayornis phoebe)
… or did not contain UV-blocker. After treatment, nestlings were placed in an experimental apparatus with individual chambers for each nestling and the provisioning behavior of adult phoebes was monitored over a two-day period by videorecording. I conducted experiments with 25 broods of Eastern …
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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
… nest was recorded at least every other day until nestlings fledged. Recordings were subsequently reviewed to quantify the provisioning behavior of male and female Eastern Bluebirds. The combined provisioning rates of male and female Eastern Bluebirds were similar for first, second, and third …
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Factors influencing pre-fledging mass recession of nestling Tree Swallows
… back feathers of half-weighted and full-weighted nestlings, respectively, between 9 and 11 days post-hatching. Video recordings were used to monitor parental provisioning behavior and nestling begging behavior. I found no differences among treatment groups in mass at fledging, amount of mass lost, …
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