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Showing 1 to 20 of 75 for “"passerine"”.
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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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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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Testing the Urban Dulling Hypothesis in an Iridescent Passerine Bird
<p>Urbanization has brought grave consequences that lead to declines in many species; however, some species thrive in urban ecosystems. This allows us the opportunity to study evolution in real time, as species adapt and change in a new setting. Novel urban ecosystems have led to phenotypic …
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Environmental Effects on the Reproductive Ecology of a Passerine Bird
I found no differences among habitats in the proportion of feeding and foraging performed by males, and little response to experimental manipulations of food supply and nest predation risk. Males did not differ in their proportion of feeding to male- and female-biased broods, but contributed …
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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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A Proximate Perspective on the Cooperative Behavior of a Lekking Passerine
Elucidating the mechanisms responsible for driving individual variation in behavior is a foundational question in organismal biology. Answering these types of questions is necessary for understanding how tradeoffs are mediated as well as potential constraints on evolutionary responses to selection. …
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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 Behavioral Ecology and Conservation of an Australian Passerine, the Brown Treecreeper (Climacteris picumnus)
… and examined these theories using an Australian passerine as a model species. The first theory concerns the mechanisms by which habitat fragmentation affects avian populations. I investigated the mechanisms causing the decline of the Brown Treecreeper (Climacteris picumnus) in fragmented habitat, …
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Site fidelity and territorial behaviour of some migratory passerine species overwintering in the Mediterranean area
Three species (Blackcaps, Sylvia atricapilla, Robin Erithacus rebecula and Black Redstart Phoenicurus ochrurus) were studied at five sites in Spain during winters 1981-84 and 1989-1994. Some birds exhibited winter site fidelity. Recoveries occurred mostly within the same winter of ringing. However, …
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Incubation temperature impacts growth, physiology and survival in nestlings of an open-cup nesting passerine
Early-life conditions can have important implications for somatic and physiological development, and later life survival. For oviparous species, embryonic development occurs wholly within the egg. During this stage, there is good evidence that egg resources such as lipid and protein content and …
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Passerine Use of Grasslands Managed With Two Grazing Regimes on the Missouri Coteau in North Dakota
… N). The impacts these systems have on grassland passerines are not fully understood. Objectives for this study include determining relative abundance, species composition and reproductive success of passerines as well as vegetation characteristics for rotational and traditional season-long …
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Passerine Exposure to Metal Contaminants from Oilsands Mining in the Athabasca Region of Northeastern Alberta, Canada
I characterized passerine exposure to metals from waste-materials associated with oilsands mining. I measured metal concentrations in whole blood of tree swallows (Tachycineta bicolor), Tennessee warblers (Oreothlypis peregrina), and chipping sparrows (Spizella passerina). Additionally, I measured …
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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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Examining environmental and life history correlates of winter and migratory movements in a nomadic Arctic-breeding passerine
The Snow Bunting (Plectrophenax nivalis) is an Arctic-breeding songbird facing population declines. The cause for these declines, however, is not well understood because of the difficulty of studying this species due to their remote breeding grounds in the Arctic and nomadic wintering movement. …
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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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