HIEBERT, S.M.*; SALVANTE, K.; RAMENOFSKY, M.; WINGFIELD, J.C.: Seasonal differences in the response of corticosterone and nocturnal torpor to energy challenge in rufous hummingbirds The energy balance of captive rufous hummingbirds (Selasphorus rufus) was challenged during the autumn migratory season and during the late winter prebasic molt by diluting the artificial nectar on which the […]

VALVERDE, R.A.*; DENVER, R.J.: Molecular Evolution of the Corticotropin-Releasing Hormone Binding Protein Corticotropin-releasing hormone (CRH) is the primary neuroendocrine mediator of the stress response in vertebrates. CRH is known to regulate appetite, locomotion, reproductive processes, and development, either by acting within the central nervous system or by functioning as a hypophysiotropin, regulating the production of […]

SALVANTE, K.G.*; WILLIAMS, T.D.: Hormonal control of reproduction: Effects of corticosterone on timing of laying, egg size, clutch size, and yolk precursor levels Egg formation involves major adjustments in lipid metabolism, including an upregulation of total lipoprotein synthesis, and production of a specific yolk-targeted very-low density lipoprotein (VLDL), and vitellogenin (VTG). Corticosterone (B) is known […]

HOOPFER, E.D.; DENVER, R.J.*: Synergistic Upregulation of Thyroid Hormone Receptor mRNAs by Thyroid Hormone and Corticosterone in Tadpoles of Xenopus laevis Corticosteroids (CS) potentiate thyroid hormone (T3)-induced metamorphosis in several amphibian species. We tested the hypothesis that corticosterone (B) induces T3 receptor (TR) expression and that this effect is at the level of transcription. Tail […]

CASH, W.B.*; HOLBERTON, R.L.: Stress and the Slider Turtle We examined physiological and behavioral questions related to stress, locomotor activity and dispersal movement in the slider turtle, Trachemys scripta. Like many other vertebrates, slider turtles show a corticosterone response to capture and handling, characterized by an increase in plasma corticosterone concentration with handling time. In […]

JENNINGS, D.H.*; WEISS, S.L.; MOORE, M.C.: Ontogenetic changes in embryonic yolk steroid content in tree lizards: Transfer of hormones from the developing embryo to the yolk? In oviparous vertebrates, hormones that accumulate in the yolk during gametogenesis regulate development and can affect a variety of morphological, physiological, and behavioral traits. We examined yolk steroid hormone […]

Maldonado, T.M.*; Jones, R.E.; Norris, D.O.: Neurodegeneration and amyloidosis in the brain of kokanee salmon (Oncorhynchus nerka kennerlyi) during sexual maturation and senescence. The brain of senescent kokanee salmon exhibits neuropathology similar to that of aging humans (Maldonado et al., Brain Research. 858, 237-251, 2000). Beta-amyloid (ABETA) is distributed regionally in the salmon brain and […]

BOORSE, G.B.; DENVER, R.J.*: Changes in Hypothalamic Corticotropin-Releasing Hormone (CRH) Content During Environmentally-Induced Metamorphosis in the Western Spadefoot Toad (Spea hammondii) Western spadefoot toads (Spea hammondii) are desert dwelling amphibians whose tadpoles can accelerate metamorphosis as their ponds dry, thereby escaping desiccation. Corticotropin-releasing hormone (CRH) may transduce the environmental signal into an endocrine response that […]

JESSOP, T.S.: A review of the rewards for the big, dumb and socially inept: Interactions between the adrenocortical stress response and life-history events of marine turtles. The acute adrenocortical stress response (ASR) is an important defensive mechanism that promotes physiological and behavioural attributes that can increase survival of vertebrates in the face of pervasive stimuli. […]

Mart�nez del Rio, C.*; Sabat, P.; Schondube, J. E.: Stable Isotope Composition as a Covariate in Comparative Physiology When animals ingest different diets, they must process contrasting arrays of nutrients, electrolytes, toxins and water. Hence, diet is a major determinant of an animal’s digestive and osmoregulatory traits and an important independent variable in comparative studies. […]