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Showing 1 to 20 of 52 for “"passerines"”.
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Gut Microbiota of Migratory Passerines at Stopover
… little is known about the gut microbiota of passerines. It is likely that gut microbes are especially important during the migratory phase; however gut atrophy experienced during prolonged migratory flight may cause disruptions of the stable microbiota. Fecal samples were collected from …
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Differential growth of body components among coexisting passerines in response to nest predation risk
… earlier. We studied 12 coexisting species of passerines to specifically test predictions that species with higher nest predation rates would prioritize growth of locomotor components (e.g. tarsi and wings) at the expense of growth of body mass. We also tested the prediction that these …
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Differential growth of body components among coexisting passerines in response to nest predation risk
… earlier. We studied 12 coexisting species of passerines to specifically test predictions that species with higher nest predation rates would prioritize growth of locomotor components (e.g. tarsi and wings) at the expense of growth of body mass. We also tested the prediction that these …
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Habitat use by wintering passerines in fire-managed forests along the U.S. Gulf Coast
… to maintain habitat quality. Numerous species of passerines, including some with declining populations, use the Gulf Coast as a wintering area, and some depend on habitats managed by fire. To provide information for land managers, I studied the winter bird community at Naval Live Oaks in Gulf …
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The use of ringing data in the study of climatic influences on common passerines
… of climatic variation on survival of 10 common passerines in southern Africa. Through sheer numbers common species are fundamental to ecosystem functioning. Migratory species are subject to climatic stochasticity in breeding and wintering grounds, and during migration. In a population of African …
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INFLUENCE OF EMBRYONIC METABOLIC RATE AND INCUBATION TEMPERATURE ON INCUBATION LENGTH VARIATION IN NEOTROPICAL PASSERINES
… in incubation periods among neotropical passerines. Incubation temperature can explain some variation in developmental periods, but substantial variation remains unexplained. Here we examine two previously untested alternatives. Adult metabolic rates differ among species and similar …
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INFLUENCE OF EMBRYONIC METABOLIC RATE AND INCUBATION TEMPERATURE ON INCUBATION LENGTH VARIATION IN NEOTROPICAL PASSERINES
… in incubation periods among neotropical passerines. Incubation temperature can explain some variation in developmental periods, but substantial variation remains unexplained. Here we examine two previously untested alternatives. Adult metabolic rates differ among species and similar …
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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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Ciclo de muda de passeriformes do sub-bosque de um trecho de mata de encosta na Serra dos Órgãos, Rio de Janeiro, Brasil
… plumage. Several aspects of molt in undergrowth passerines, such as molting period, sequence of feather replacement, and rate were studied using a system of scores with banded birds from July 1995 to June 1997 in a section of Atlantic forest in the foothills of Serra dos Órgãos, Rio de Janeiro. …
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Skeletal evolution and convergence in the hyperdiverse passerine radiation
… crown group oscines (the other primary clade of passerines) were present by the late Oligocene. Inadvertently, this project revealed evidence of pervasive convergent evolution, or homoplasy, in the passerine carpometacarpus. In Chapter 3, I present a new method of quantifying homoplasy in …
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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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How does urbanisation affect the breeding performance of African Crowned Eagles (Stephanoaetus coronatus)?
… of the studies exploring this issue were done on passerines and carried out in the global north, with very few studies exploring this topic on non-passerines, and even fewer in Africa. Studies addressing urban productivity in apex predators with slow life histories that are often of conservation …
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Predicting the distribution and impacts of non-native birds in the Iberian Peninsula
… as a study system. The number of non-native passerines in the Iberian Peninsula has increased in the late 20th century, with the common waxbill Estrilda astrild, yellow-crowned bishop Euplectes afer, red avadavat Amandava amandava and black-headed weaver Ploceus melanocephalus all established …
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Passerine Exposure to Metal Contaminants from Oilsands Mining in the Athabasca Region of Northeastern Alberta, Canada
… evidence that metals were elevated in tissues of passerines near oilsands operations. Nest success and nestling growth were influenced by local environmental conditions and not affected by proximity to mining operations.
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Prothonotary Warbler (Protonotaria citrea) Plumage as an Indicator for Infection: the Relationship between Haemosporidia Infection and Breast Feather Reflectance in a Neotropical Migrant Passerine
… (n=169), insectivorous Neotropical migrant passerines, throughout the Ultraviolet (UV) and human visible light spectra and examines the relationship between Haemosporidia (pathogen causing Avian Malaria) infection and feather reflectance (n=41). Reflectance was characterized using a …
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Pituitary Prolactin Content of the Redwinged Blackbird at Pre-Breeding, Breeding and Post-Breeding Intervals
… Most of the early literature deals with the non-passerines, specifically doves, pigeons and fowl. However, recent work has involved the order Passeriformes. The Redwinged Blackbird (Agelaius phoeniceus) of this order is the subject of the present investigation. Changes in prolactin quantities of …
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Immanuel Kant's Sparrow
… the imitative ability (song learning ability) in passerines, it might be more appropriate to focus on the multiplicity of factors involved in song production that - shaped by different selective forces - promote the highly specific song adaptations.
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Natal dispersal and first-year survival in a neotropical migratory songbird
… because first-year (i.e. 1-year-old) migratory passerines are thought to return to breed at great distances from their natal location, the factors that influence first-year survival have not been thoroughly investigated. To examine the factors that affect first-year survival, I determined the …
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The biology of the Cape Weaver Ploceus Capensis with special reference to its polygnous mating system
… the first comprehensive study of moult in passerines in southern Africa. The more important findings are that moult is slower than in the northern hemisphere and that there are differences in the start of moult in different age/ sex classes. The food situation in the Cape Weaver is reported …
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