BARKER, J.U.; ASHLEY-ROSS, M.A.*: The effect of fiber type heterogeneity on work and power output of hindlimb muscles of the tiger salamander Most vertebrate muscles are composed of a mixture of fiber types. However, study of the mechanical performance of muscle has concentrated on homogeneous bundles of muscle fibers. Muscles in the hindlimb of the […]

Wyneken, J.*; Steinberg, F.: The Use of CT and Functional MRI to Examine Cardiopulmonary Structure and Function in Ecologically Distinct Species of Turtles. Sea turtles are secondarily aquatic are migratory specialists. As such, they possess suites of morphological, behavioral and physiological adaptations for migratory life. These include unique sets of cardiopulmonary structures that may serve […]

HOOGE, M.D.*; TYLER, S.: Non-muscle actin in sclerotic components of the female reproductive system of acoel turbellarians The seminal bursa of many acoel turbellarians is associated with an insemination canal, called a mouthpiece or nozzle, that appears sclerotized–that is, stiff and refractile by light microscopy. The mouthpiece is composed of stacks of ring-shaped cells and […]

CAVEY, M.J.*; WILKENS, J.L.: F-actin in the Amuscular Arteries of the American Lobster Seven vessels leave the heart of the lobster Homarus americanus: the unpaired anterior median artery, sternal artery, and dorsal abdominal artery and the paired anterior lateral arteries and hepatic arteries. Superficially, these arteries have a common, relatively-simple organization, consisting of an elastic […]

SCHAACK, S.*; CHAPMAN, L.J.: Cascading effects of hypoxia on the functional morphology, ecology, and diversification of an African cyprinid. Adaptive change in one character may affect associated, but functionally unrelated, characters in an adaptive or non-adaptive way. For example, in some fish species, individuals living in low oxygen environments have larger gills than conspecifics living […]

HOLBERTON,R.*; WILSON,C.M.; SIMS,C.; CASH, W.B.: The Role of Corticosterone and the Effects of its Inhibition During the Development of Migratory Condition in Dark-eyed Juncos. To understand corticosterone’s role in the development of migratory feeding and fattening, dexamethasone (DXM) was used to inhibit an increase in baseline corticosterone often observed during migration. Dark-eyed juncos (Junco hyemalis) […]

WILSON, C.M.*; HOLBERTON, R.L.: The Endocrine Basis for Trade-offs between Immediate Survival and Reproductive Success in Arctic- and Temperate-breeding Yellow Warblers While temperate breeding birds can renest or produce more than one successful clutch each year, Arctic-breeders are unlikely to raise more than one clutch annually due to shorter breeding seasons and unpredictable weather. Despite […]

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 […]