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Documents disponibles écrits par cet auteur (14)
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Article
Rosen M. Chang, Auteur ; Christopher G. Guglielmo, Auteur ; Catherine M. Ivy, AuteurThe pectoralis major is the muscle required for migratory flight in songbirds, and has been believed to be exclusively composed of fast oxidative glycolytic (FOG) fibers in most small songbirds (
Article
Jessica E. Deakin, Auteur ; Christopher G. Guglielmo, Auteur ; Yolanda E. Morbey, AuteurIn many migratory songbirds, males arrive earlier at stopover sites and at the breeding grounds (‘protandry’) and older birds precede younger ones, but less is known about age differences in protandry. In seasonal environments, differential timi[...]
Article
Chad L. Seewagen, Auteur ; Yanju Ma, Auteur ; Yolanda E. Morbey, Auteur ; Christopher G. Guglielmo, AuteurMercury (Hg) is a global pollutant that has wide-ranging impacts on the physiological systems of birds, but almost nothing is known about how this affects migration. We manipulated methylmercury (MeHg) burdens of 24 wild-caught Yellow-rumped War[...]
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Quentin R. Hays, Auteur ; Yolanda E. Morbey, Auteur ; Keith A. Hobson, Auteur ; James E. Lyons, Auteur ; Christopher G. Guglielmo, AuteurMigration distance and sex are integral to avian migration strategies, yet these intrinsic factors are understudied with respect to their effects on stopover ecology and behavior. We investigated how individual variation in migration distance an[...]
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Yanju Ma, Auteur ; Brian A. Branfireun, Auteur ; Keith A. Hobson, Auteur ; Christopher G. Guglielmo, AuteurMercury (Hg) is a well-known global contaminant that persists in the environment. The organic form, methylmercury (MeHg) has been shown to adversely affect bird immune function, foraging behavior, navigation, and flight ability, which individual[...]
Article
Lisa V. Kennedy, Auteur ; Yolanda E. Morbey, Auteur ; Stuart A. Mackenzie, Auteur ; Philip D. Taylor, Auteur ; Christopher G. Guglielmo, AuteurQuantitative magnetic resonance (QMR) is a non-invasive technology used to measure body composition. It has great potential to advance the study of energetics and fuel use of migratory birds. However, there is concern that exposure to a strong m[...]
Article
Christopher G. Guglielmo, Auteur ; Alexander R. Gerson, Auteur ; Edwin R. Price, Auteur ; Quentin R. Hays, AuteurThe catabolism of protein from organs and muscles during migratory flight is necessary to produce glucose, key metabolic intermediates, and water, but may have negative effects on flight range and refueling at stopovers. We tested the hypothesis[...]
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Chad L. Seewagen, Auteur ; Christopher G. Guglielmo, Auteur
Article
J. Morgan Brown, Auteur ; Brendan J. McCabe, Auteur ; Lisa V. Kennedy, Auteur ; Christopher G. Guglielmo, AuteurIntraspecific competition can influence refuelling at migration stopover sites. White-throated sparrows Zonotrichia albicollis have genetically-determined plumage morphs that differ in dominance behaviour and competitive abilities. This study ex[...]
Article
Lauren F. Rae, Auteur ; Greg W. Mitchell, Auteur ; Robert A. Mauck, Auteur ; Christopher G. Guglielmo, Auteur ; D. Ryan Norris, AuteurRadio telemetry can be a valuable tool for studying the behavior, physiology, and demography of birds. We tested the assumption that radio transmitters have no adverse effects on body condition in an island population of Savannah Sparrows (Passe[...]
Article
Ryan M. Zajac, Auteur ; David J. Cerasale, Auteur ; Christopher G. Guglielmo, AuteurIn order to apply plasma metabolite profiling to assess the quality of stopover habitat for migrant birds it is crucial to know how quickly metabolite concentrations change in response to variation in energy intake rate. We fed live mealworms to[...]
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Greg W. Mitchell, Auteur ; Nathaniel T. Wheelwright, Auteur ; Christopher G. Guglielmo, Auteur ; D. Ryan Norris, AuteurCosts of reproduction represent a common life-history trade-off. Critical to understanding these costs in migratory species is the ability to track individuals across successive stages of the annual cycle. We assessed the effects of total number[...]
Article
Christopher G. Guglielmo, Auteur ; Liam P. McGuire, Auteur ; Alexander R. Gerson, Auteur ; Chad L. Seewagen, AuteurAn ideal technology for non-invasive analysis of body composition should provide highly precise and accurate direct measurements of fat, lean mass and total water of non-anaesthetized subjects within minutes. We validate a quantitative magnetic [...]
Article
Raymond H. Thomas, Auteur ; Edwin R. Price, Auteur ; Chad L. Seewagen, Auteur ; Stuart A. Mackenzie, Auteur ; Mark A. Bernards, Auteur ; Christopher G. Guglielmo, AuteurPreen wax is important for plumage maintenance and other functions. Its chemical composition is complex, and separating and quantifying its components, commonly by gas chromatography (GC), can be challenging. We present a simple analytical syste[...]
