Global ETD Search
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Showing 1 to 18 of 18 for “"passerine birds"”.
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Evolution and diversity of passerine birds of Australasia
Passeriformes (passerines) is the largest and most diverse order of living birds, comprising over 50% of the world's avifauna. Because of their ubiquity, enormous diversity and exceptional plasticity, passerines represent an excellent vertebrate group for investigating a wide range of evolutionary, …
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Theory and Pattern of Life-History Evolution in Passerine Birds
A model of life-history evolution in passerine birds was developed to relate predicted traits to the maximum long-term rate of population increase. Differences in life-history traits among species were hypothesized to result from the interacting effects of mortality expressed as within-brood …
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Inference of phylogenetic relationships in passerine birds (Aves: Passeriformes) using new molecular markers
… of this study was to provide deeper insights in passerine phylogenetic relationships using new molecular markers. The monophyly of the largest avian order Passeriformes (~59% of all living birds) and the division into its suborders suboscines and oscines are well established. Phylogenetic …
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The pharmacokinetics and pharmacodynamics of oral ponazuril in the treatment of systemic isosporosis in passerine birds
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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Some aspects of the biology and host-parasite interactions of Isospora spp. (Protozoa: Coccidiida) of passerine birds
… coccidia that has been rarely studied in passerine birds. We established a method of estimating the intensity of Isospora infection and showed diurnal periodicity in oocysts output. We studied fauna of Isospora species and their host specificity. Ground feeders are more frequently and …
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The phylogenetics, taxonomy and biogeography of African arid zone terrestrial birds : the bustards (Otididae), sandgrouse (Pteroclidae), coursers (Glareolidae) and Stone Partridge (Ptilopachus)
… four groups of unrelated terrestrial non-passerine birds, that have endemics in both the south-west and north-east arid-zone lowlands (and Sahel), and which also encompass taxa with differing habitat tolerances, mobility and life-history traits, were examined: the bustards (Otididae), …
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Birds, molecules, and evolutionary patterns among Africa's islands in the sky
… between many clades (8-12%) of montane passerine birds in Africa, with some shallow divergence towards the tips (4-6%). For widespread species reciprocal monophyly has not been reached in some instances, but generally there is some support for the refuge idea that isolation …
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Skeletal evolution and convergence in the hyperdiverse passerine radiation
Among vertebrates, passerine birds are an exceptionally diverse group (>6,000 living species) encompassing more than half of living bird diversity. In this thesis I present primary descriptive anatomical work (Chapters 2 & 4), phylogenetic inference (Chapter 2), and novel quantitative approaches …
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Corticosterone as a mediator of the tradeoff between survival and reproduction
… corticosterone) in several species of passerine birds to address this question from a variety of angels. I first provide direct support for corticosterone playing a role in the reproduction-survival tradeoff. Stress-induced measures of corticosterone predicted greater survival and lower …
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Corticosterone as a mediator of the tradeoff between survival and reproduction
… corticosterone) in several species of passerine birds to address this question from a variety of angels. I first provide direct support for corticosterone playing a role in the reproduction-survival tradeoff. Stress-induced measures of corticosterone predicted greater survival and lower …
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Important bird areas in the southern part of West Iceland
… **, followed by waders, gulls and relatives. Passerine birds and raptors were present in low numbers. Most of the recorded species breed and nest in Iceland, but some passage migrants, vagrants and wintering guests were also seen. A total of 21,687 birds were seen and 49 species were recorded, …
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Biotic Responses on Typha-monodominant Semipermanent Wetlands To Cattle Grazing
… and post treatment weeks of 1984 and 1985. Passerine birds, waterfowl, and aquatic invertebrates were sampled during the week corresponding to the vegetative sampling. The grazing treatment was sufficient to alter the biotic state of emergent march compared to the un-grazed plots. Live and …
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Anting Behavior in Birds: Ant Selection and Effect of ant Chemistry on Feather Ectoparasites
<p>Active anting behavior occurs when songbirds apply ants to their feathers. During anting displays, a bird draws its wings forward in front of the head and swings its tail around to the far right or left. Both wing and tail feathers are then rubbed with ants held in the bird's beak. The potential …
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Effects of Grazing on Nongame Breeding brids, Insects, and Vegetation in Conservation Reserve Program Grasslands in North Dakota
… effects of various land use practices on nongame birds, insect biomass, and vegetation structure in Conservation Reserve Program (CRP) grasslands in North Dakota. Breeding bird surveys were conducted and insect collections and vegetation measurements were taken in 3 of the 4 CRP tracks that were …
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The role of social environment in shaping vocal communication systems in wild songbirds
… social and ecological environments. Among passerine birds, vocal signals are critical to survival and play an important role in mate attraction, territory defense, and predator avoidance. In my dissertation, I study acoustic communication in a wild population of blue tits and great tits in …
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Determining the Pathogenesis and Enzootic Transmission of Usutu Virus
… cause neurological disease in humans and wild birds. USUV is maintained in an enzootic cycle between wild birds, primarily passerine species, and ornithophilic mosquitoes, predominantly Culex spp. mosquitoes. Since its first isolation in 1959 in South Africa, USUV has spread throughout …
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Cross-protection from St. Louis encephalitis virus and Usutu virus disease by human West Nile virus convalescent plasma in mice
… a sylvatic cycle involving avian hosts, such as passerine birds, and mosquitoes. However, they can accidentally spill over to humans through mosquito bites or wildlife exposure. Although humans generally remain asymptomatic and do not support sufficient viral replication for transmission, they …