Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 20 for “"Blackbirds"”.
-
Habitat Selection by Yellow -Headed Blackbirds
… in a neotropical migrant, the Yellow-headed Blackbirds (Xanthocephalus xanthocephalus). This research was conducted in two declining populations in northeastern Illinois. I found that at the largest spatial scale, immigrants appear not to settle in the Illinois populations, probably because …
-
Resident and migrant blackbirds in southeastern Virginia: Agricultural depredations and winter roost locations
… and distribution of agricultural damage by blackbirds, county-wide damage appraisals were conducted in the fall of 1960. Crops checked included corn, peanuts, and milo. Based on the 96 fields examined throughout Nansemond County, the average monetary loss to the corn crop was slightly less …
-
Food Size And Foraging Site Selection In A Breeding Population Of Red- Winged Blackbirds (Agelaius Phoeniceus)
The size of organisms fed to nestling red-winged blackbirds was significantly larger than if selection of food were random. There also appeared to be a selection for "soft-bodied" items. This may be due to selection for soft anatomy per se or selection as a function of the ease of capture. The …
-
Breeding Biology of Red-winged Blackbirds (Agelaius phoeniceus) in Stormwater Retention Ponds on the College at Brockport Campus
Red-winged Blackbirds (Agelaius phoeniceus) often breed in stormwater retention ponds. I studied the breeding biology of the species in seven small retention ponds at the College at Brockport, to evaluate their breeding success in a created habitat relative to data from studies in natural habitats. …
-
Variation drives response to urbanisation: Evolutionary ecology of two introduced birds within anthropogenic environments : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
… behavioural and morphological traits that allow blackbirds (Turdus merula merula Linnaeus, 1758) and thrushes (Turdus philomelos C. L. Brehm, 1831) to thrive in New Zealand anthropogenic landscapes. Urban blackbirds and thrushes were bolder, more aggressive and more exploratory compared to rural …
-
Nontarget Avian Use of DRC-1339 Treated Plots During An Experimental Blackbird Control Program in Eastern South Dakota
… DRC-1339 to reduce the population of depredating blackbirds (red-winged blackbirds [Agelaius phoeniceus], yellow-headed blackbirds [Xanthocephalus xanthocephalus], and common grackles [Quiscalus quiscula]) in the northern Great Plains. As part of this control program, brown rice baits are treated …
-
Metromorphosis : evolution on the urban island
… to take advantage of human handouts in London, blackbirds are adjusting their physiology to relax around humans, and two forms of mosquito are diverging in the London tube system. Cities are hotbeds of evolutionary change, and regardless of whether or not new forms of life are destined to arise, …
-
Genotypic and Phenotypic Determinants of Japanese Encephalitis Virus Geographical Expansion
… model of JEV viremia revealed that 100.0% of blackbirds developed detectable viremias following inoculation with the GI-a and GI-b isolates, while only 66.7% of blackbirds developed viremias following inoculation with the GII and GIV isolates. These results suggest that GI-b may have emerged …
-
Coping with Chronic Infection: The Role of Glucocorticoid Hormones in Mediating Resistance and Tolerance to Parasites
… and tolerance to infection in red-winged blackbirds (Agelaius phoeniceus) infected with Haemosporidians, including malaria (Plasmodium) and malaria-like (Haemoproteus and Leucocytozoon) parasites. I performed a medication experiment (Chapter II) to identify the physiological consequences …
-
Avian and Aquatic Invertebrate Abundance on Three Agricultural Management Systems in Eastern South Dakota
… neglecta) in 1993 oats and yellow-headed blackbirds (Xanthocephalus xanthocephalus) in 1993 alfalfa were found to be significantly more abundant on the CON system. The remaining B species were significantly higher on the ORG and/or TNT farming systems. Ten avian species were found to have …
-
Modelling the spatial distribution of blackbird (Turdus merula) and ring ouzel (Turdus torquatus) in Switzerland
… occur in altitudes above 1’000 m a.s.l. only, blackbirds occur from the lowlands up to the timber line. The altitudinal range overlap of the two species is up to 400 m. Despite both species coexist on macroscale, a direct niche overlap on territory scale is rare. Small-scale differences in …
-
Nongame Vertebrate Survey of Sand Lake National Wildlife Refuge, Brown County, South Dakota
… in PFOC and 41 species in PEMF. Yell ow-headed blackbirds (Xanthocephalus xanthocephalus) (freq. of occurrence= 99%) and marsh wrens (Cistothorus palustris) (freq. of occurrence= 70% [PFOC] and 89%[PEMF]) were the two most abundant species in both wetland habitat types. Small mammals were …
-
Historical Genetic Analysis Of Horned Lark (Eremophila Alpestris) Specimens From The Prairie Pothole Region
… museum specimens of Horned Larks, Red-winged Blackbirds (Agelaius phoeniceus) and Franklin's Gulls (Leucophaeus pipixcan) from the University of North Dakota Vertebrate Museum Collection. Sampling methodology was investigated by using three mechanisms of DNA isolation: EDTA with proteinase K …
-
The description of the bronzed grackle & its general osteology and myology
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science, 1929
-
Non-game Birds in Relation to habitat Variation on South Dakota Wetlands
… of territorial male red-winged and yellow-headed blackbirds on semi-permanent ponds explained 47 and 57 percent of the variation respectively. Results of discriminant analysis of the presence and absence of the other target species generally explained less than 10 percent of the variation. The …
-
Grassland and Woodland Bird Occurrence and Habitat Selection in the Prairie-Forest Transition Zone of Minnesota
… <em>(Melospiza melodia)</em>, Red-winged Blackbirds <em>(Agelaius phoeniceus)</em>, Sedge Wrens <em>(Cistothorus platensis)</em>, and Bobolinks<em> (Dolichonyx oryzivorus)</em> were present on the most grassland points, while Eastern Wood-pewees <em>(Contopus virens)</em>, House Wrens<em> …
-
Landscape Fragmentation and Grassland Patch Size Effects on Non-game Grassland Birds in Xeric Mixed-grass Prairies of Western South Dakota
… longspurs, bobolinks and red-winged blackbirds. Grasshopper sparrows and western meadowlarks were observed in >99% of grassland patches. Avian community composition was affected by landscape fragmentation and grassland patch sizes. Chestnut-collared longspurs were more abundant in …
-
EFFECTS OF SCALE AND HABITAT MANAGEMENT ON GRASSLAND BIRD RESPONSE IN CONSERVATION RESERVE PROGRAM FIELDS IN NORTHWEST ILLINOIS
… nest survival rate for 2 species (red-winged blackbirds and dickcissels) and 2 groups of nesting communities (ground and above-ground nesters). Temporal variables such as Julian date and stage of nest were significant predictors of nest survival for red-wings (50.58 ∆AICc = best temporal …
-
Assessing the relationships between pollinator-friendly plantings and birds, bats and white-tailed deer on farms in the Coastal Plain of Virginia and Maryland
… in the pollinator-friendly plots by red-winged blackbirds (Agelaius phoeniceus; n=7). These nests were placed in locations within the pollinator plots with higher forb coverage than random points in the same plots without nests. We estimated the presence and relative activity of bats in 4 cover …