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.
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Showing 1 to 20 of 62 for “"sparrows"”.
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Evaluating the Use of Autonomous Recording Units to Monitor Yellow Rails, Nelson's Sparrows, and Le Conte's Sparrows
… (Coturnicops noveboracensis) (YERA), Nelson’s sparrows (Ammodramus nelsoni) (NESP), and Le Conte’s sparrows (Ammodramus leconteii) (LCSP) are poorly known, so systematic surveys of these elusive species are needed to inform conservation planning and guide management. A standardized protocol for …
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Habitat partitioning by sparrows along an elevational gradient
… were unable to account for the distributions of sparrows wintering along an elevational gradient in the Sonoran Desert of southern California, USA. Sage sparrows (Amphispiza belli), black-throated sparrows (A. bilineata) and dark-eyed juncos (Junco hyemalis) inhabit different vegetation types. …
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Alarm Calls and Seeet Calls of Some Central Texas Sparrows
No abstract prepared.
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PATERNAL ATTRACTIVENESS AND PARENTAL INVESTMENT STRATEGIES IN SONG SPARROWS MELOSPIZA MELODIA
… feeding rates in a wild population of song sparrows (Melospiza melodia melodia). Male song complexity appeared to affect female mating tactics, as males that had smaller song repertoires lost paternity more frequently than did males retaining full paternity within the offspring of their …
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Breeding Behavior and Reproductive Success of Chipping Sparrows in Northwestern Minnesota
<p>The reproductive biology of Chipping Sparrows (Spizella passerina) was studied during 2 breeding seasons at the University of Minnesota Forestry and Biology Station, Itasca State Park, Minnesota. Reproductive success was determined primarily by the incidence of nest predation. Parasitism by …
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Wintering white-throated sparrows (Zonotrichia albicollis): home ranges, aggression and corticosterone
<p>White-throated sparrows (Zonotrichia albicollis) are songbirds that spend the non-breeding season in southeastern North America, where they form philopatric territorial flocks. Flocks exhibit dominance hierarchies, with dominance rank associated with an individual's age and prior residence in …
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Seasonality and trade-offs in equatorial rufous-collared sparrows (Zonotrichia capensis)
… and trade-offs in tropical rufous-collared sparrows (Zonotrichia capensis) in the humid Andes of Ecuador, then compared my data to temperate-zone Zonotrichia. In Chapter II, I investigated the function of male territorial aggression. Males had peak territorial aggression scores during …
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Comparative study of the vocalizations and singing behavior of four Aimophila sparrows
… and singing behaviors of Rufous-crowned Sparrows, Rufous-winged Sparrows, and Cassin's Sparrows were analyzed, described, and compared. For comparative purposes, data from previously studied Five-striped Sparrows were also included. Ten, 5, 3, and 6 types of calls were present in the …
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Behavior, Physiology, and Reproduction of Urban and Rural Song Sparrows (Melospiza Melodia)
… novel habitats more generally. Using song sparrows (Melospiza melodia), a native songbird commonly found in urban areas, I explored responses to urbanization and the drivers and consequences of these responses with an eye toward understanding whether song sparrows had successfully adapted …
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Estimating the Impact of House Sparrows on Eastern Bluebird Reproductive Success Across an Urban Gradient
Non-indigenous species are widely reported to compromise the population growthof native species, but quantitative estimates of this are often lacking. As a result, management recommendations for non-native species are frequently rooted in subjective speculation and thus have poor predictive power. …
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Reproductive physiology, avian malaria, and the cloacal microbiome in tropical Rufous-collared Sparrows (Zonotrichia capensis)
… variation in testosterone. Using rufous-collared sparrows (Zonotrichia capensis), a Neotropical songbird with a wide distribution, I explored geographical patterns of variation in testosterone levels and infection by haemosporidians, a type of blood parasite. I found that testosterone did not vary …
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Habitat Characteristics Affecting Site Occupation in Wintering Henslow’s Sparrows at Mississippi Sandhill Crane National Wildlife Refuge
… depth are important to wintering Henslow’s sparrows. My study asked how habitat variables including vegetation structure, seed abundance, and arthropod abundance predict Henslow’s sparrow site occupancy at Mississippi Sandhill Crane National Wildlife Refuge. In this study, Henslow’s sparrow …
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IMPACTS OF BLOODBORNE PATHOGEN INFECTIONS ON BREEDING ECOLOGY AND SUCCESS IN WHITE-THROATED SPARROWS (Zonotrichia albicollis)
… the role of the infected parent. White-throated Sparrows are a polymorphic species that mate disassortatively and display alternative reproductive strategies associated with color morph. White-striped birds are more aggressive, more promiscuous, and less parental than their tan- striped …
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Habitat selection in restored grasslands: the role of social cues in the settlement of Grasshopper Sparrows
… cues in the settlement behavior of Grasshopper Sparrows (Ammodramus savannarum) in new habitats. I played conspecific vocalizations at newly created grasslands and compared settlement rates and breeding densities at those sites to control sites, without vocalizations. A subset of sites was …
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Scanning-group-size effect in flocks of house sparrows : quantifying the contribution of competition and anti-predatory vigilance
… to the scanning-group-size effect of house sparrows ( Passer domesticus ) observed while they fed from an artificial seed patch during the winter. The inter-scan pecking rate of individuals, excluding scanning, increased with group size while handling time per peck decreased. Dominants …
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The expansion of the eastern house finch population and its impact on populations of house sparrows, purple finches and American goldfinches
… House Finch population and its impact on House Sparrows, American Goldfinches and Purple Finches in Indiana. Data from the Annual Christmas Bird Counts of the National Audubon Society (CBC) were used to construct five winter range maps to show the expansion of the House Finch population since …
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Song learning in the song sparrow (Melospiza melodia): ecological and social factors
… in a sedentary Washington population of song sparrows ( Melospiza melodia). In the first study, I examined the song repertoires of an entire cohort of males and compared them to those of potential song tutors. I found that a young male (1) learns whole song types, (2) learns songs from …
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Investigating the causes of the decline of the urban house sparrow Passer domesticus population in Britain
… success and annual productivity of nesting House Sparrows along an urban-suburban-rural gradient centred on the city of Leicester, England. Chick diet (inferred from faecal remains), habitat selection by foraging adults and over-winter survival were also studied. Data were collected during …
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Immanuel Kant's Sparrow
… it may go largely unnoticed by humans. House sparrows singing canary song have been known by hobbyists for a long time. My study is the first to analyse the imitative abilities of house sparrows in detail. I used an integrative approach considering features that are particularly important for …
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