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Documents disponibles écrits par cet auteur (9)
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Article
Kate F. Gibson, Auteur ; Tony D. Williams, AuteurFemale birds can potentially utilise various mechanisms, such as intraclutch egg size variation (ICESV), to modulate offspring quality. If this represents an ‘adaptive’ strategy allowing females to adjust reproductive effort after laying of the [...]
Article
Tony D. Williams, Auteur ; Melinda A. Fowler, AuteurHow hard do birds work during parental care, chick rearing, or provisioning of their nestlings? And if birds do work hard, can we detect a physiological signature of individual variation in workload ability (perhaps related to ‘quality’) or cost[...]
Article
Rebecca L. Bentzen, Auteur ; Abby N. Powell, Auteur ; Tony D. Williams, Auteur ; Alexander S. Kitaysky, AuteurWe measured plasma concentrations of variables associated with lipid metabolism (free fatty acids, glycerol, triglyceride, and beta-hydroxybutyrate), protein metabolism (uric acid), and baseline corticosterone to characterize the nutritional sta[...]
Article
Evolutionary endocrinology: The developing synthesis between endocrinology and evolutionary genetics
Anthony J. Zera, Auteur ; Lawrence G. Harshman, Auteur ; Tony D. Williams, AuteurA productive synthesis of endocrinology and evolutionary genetics has occurred during the past two decades, resulting in the first direct documentation of genetic variation and correlation for endocrine regulators in nondomesticated animals. In [...]
Article
Eloise Rowland, Auteur ; Oliver P. Love, Auteur ; Jan J. Verspoor, Auteur ; Lani Sheldon, Auteur ; Tony D. Williams, AuteurTraditionally, studies of sexually size-dimorphic birds and mammals report that the larger sex is more sensitive to adverse environmental conditions during ontogeny. However, recent studies in avian species that exhibit moderate size-dimorphism [...]
Article
Kristen B. Gorman, Auteur ; Paul L. Flint, Auteur ; Daniel Esler, Auteur ; Tony D. Williams, AuteurStudies of female waterfowl nutrient reserve use during egg production require a precise understanding of ovarian follicle dynamics to correctly interpret breeding status, and, therefore, derive proper inference. Concerns over numerical declines[...]
Article
Pierre Legagneux, Auteur ; Holly L. Hennin, Auteur ; H. Grant Gilchrist, Auteur ; Tony D. Williams, Auteur ; Oliver P. Love, Auteur ; Joel Bety, AuteurTheoretically, individuals of migratory species should optimize reproductive investment based on a combination of timing of and body condition at arrival on the breeding grounds. A minimum threshold body mass is required to initiate reproduction[...]
Article
Tony D. Williams, Auteur ; Raime B. Fronstin, Auteur ; Aki Otomo, Auteur ; Emily Wagner, AuteurThe levels of haematocrit (Hct) and plasma haemoglobin (Hb) vary markedly through the annual cycle of birds, as well as among individuals at all life-stages (embryos, chicks, adults). It is thus surprising that the functional, fitness-related co[...]
