Synergistic Upregulation of Thyroid Hormone Receptor mRNAs by Thyroid Hormone and Corticosterone in Tadpoles of Xenopus laevis

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 […]

Stress and the Slider Turtle

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 […]

Ontogenetic changes in embryonic yolk steroid content in tree lizards Transfer of hormones from the developing embryo to the yolk

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 […]

Neurodegeneration and amyloidosis in the brain of kokanee salmon (Oncorhynchus nerka kennerlyi) during sexual maturation and senescence

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 […]

Changes in Hypothalamic Corticotropin-Releasing Hormone (CRH) Content During Environmentally-Induced Metamorphosis in the Western Spadefoot Toad (Spea hammondii)

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 […]

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

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. […]

Stable Isotope Composition as a Covariate in Comparative Physiology

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. […]

Modeling the intermittent exercise strategy of Ride and Tie competition

WEINSTEIN, R.B.*; HARTMAN, J.H.: Modeling the intermittent exercise strategy of “Ride and Tie” competition Intermittent exercise is characterized by bouts of exercise alternated with pauses. When exercise bouts are performed at a high intensity, brief pauses provide time for recovery from the preceding exercise bout. In “Ride and Tie”, a competitive sport incorporating intermittent exercise, […]

Microsites Characteristics of Muhlenbergia richardsonis, an alpine C4 Plant

Sage, R.F.*; Sage, T.L.: Microsites Characteristics of Muhlenbergia richardsonis, an alpine C4 Plant. C4 plants are uncommon in cold environments at high latitude and altitude, and are not generally thought to occur in the alpine tundra. In the White Mountains of California, we found that the C4 grass Muhlenbergia richardsonis commonly occurs in the alpine […]

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