Pak, T.R.*; Lynch, G.R.; Tsai, P.-S.: TESTOSTERONE AND ESTROGEN ACT VIA DIFFERENT PATHWAYS TO INHIBIT PUBERTY IN MALE SIBERIAN HAMSTERS Testosterone (T), dihydrotestosterone (DHT), and 17b-estradiol (E) induce testicular regression in peripubertal, male, Siberian hamsters, Phodopus sungorus. Since T can be converted to DHT or E, whether T acts directly or through its metabolites to […]

MAYER, L.P* and; DYER, C. A.; PROPPER, C. R.: Sexual dimorphism in gonadal steroidogenic factor 1 (SF-1) expression during sexual differentiation and the effects of octylphenol on the differentiation process in the American bullfrog Rana catesbeiana. Gonadal steroidogenesis during development is critical to differentiation of the adult sexually dimorphic phenotype and reproductive function. Environmental contaminants […]

Howdeshell, K.L.*; Ruhlen, R.L.; Welshons, W.V.; vom Saal, F.S.: Serum regulation of estrogenic endocrine-disrupting chemicals during mouse neonatal development Certain chemicals used in plastics and other products are capable of disrupting development by mimicking the action of the sex hormone estradiol, and thus are referred to as estrogenic endocrine disrupting chemicals (EEDCs). While traditional risk […]

SELCER, K.W.*; DAY, A.M.; VERBANIC, J.D.: Northern Leopard Frog (Rana pipiens) Vitellogenin: Purification, Development of an Immunoassay, and Characterization of Induction Following Immersion in Diethylstilbestrol In oviparous vertebrates, estrogen stimulates the female liver to produce the egg yolk precursor, vitellogenin. This protein circulates in the blood, is taken up by oocytes, and is cleaved into […]

CHEEK, A.O.*; BROUWER, T.H.; CARROLL, S.; MANNING, S.; MCLACHLAN, J.A.; BROUWER, M.: Experimental evaluation of vitellogenin as a predictive biomarker for reproductive disruption Vitellogenin (VTG) synthesis in male oviparous vertebrates is used as an indicator of environmental estrogen exposure, yet the reproductive consequences of exposure are unknown. To examine whether VTG expression predicts reproductive impairment, […]

LIKNES, E.T.*; SWANSON, D.L.: Seasonal Metabolic Acclimatization in the American Goldfinch Revisited: To What Extent Does Summit Metabolism Vary Seasonally? Large seasonal changes in summit metabolic rate (Msum) have been considered only a minor component of winter acclimatization in small birds. This conclusion is based largely on data from Cardueline finches, including American Goldfinches. Recent […]

MEAGHER, E.*; PABST, D.A.; MCLELLAN, W.; WESTGATE, A.; WELLS, R.: Heart rate, respiration and heat flux across the dorsal fin in wild bottlenose dolphins, Tursiops truncatus The dolphin dorsal fin is a thermal window, invested with blood vessels that function to conserve or dissipate body heat depending on thermoregulatory demands. Heat flux, measured at a […]

KROCHMAL, A.R.*; BAKKEN, G.S.: Evidence for the Use of Facial Pits for Behavioral Thermoregulation In the Western Diamondback Rattlesnakes (Crotalus atrox) Pit vipers (Crotalinae) possess unique organs, called facial pits, which can detect subtle fluctuations in emitted thermal radiation. Facial pits are used for prey location and strike direction, demonstrating that pit vipers can incorporate […]

O’Connor, M.P.*; Zimmerman, L.C.; Spotila, J.R.: Effects of behavior, physiology, and habitat on thermoregulation in desert tortoises. Desert tortoises are herbivorous ectothermic denizens of the Mojave and Sonoran deserts whose thermal ecology constrains activity and resource acquisition on both seasonal and daily time scales. We used behavioral observations of individual tortoises with temperature sensitive telemeters, […]

Helmuth, B.*; Hofmann, G.E.: Defining thermal stress in the rocky intertidal: linking ecology and physiology through biophysics Thermal stress is thought to be an important determinant of organismal distribution, abundance, and productivity in the rocky intertidal zone. Yet, we know surprisingly little of how body temperatures change in space and time, and of how these […]