REES, B.B.*; SCHULTE, P.M.: Is intron 2 of the Fundulus lactate dehydrogenase B gene a hypoxia responsive element? Previous studies have shown that liver lactate dehydrogenase B (LDH-B) activity increases during hypoxic exposure of F. heteroclitus. Several glycolytic genes in mammals are known to be upregulated during hypoxia via the binding of hypoxia-inducible factor (HIF-1) […]

TOMANEK, L.*; SOMERO, G.N.: Heat-shock protein (hsp) 70 and promoter sequences in species of the genus Tegula from widely differing thermal environments Marine gastropod species of the genus Tegula occupy widely differing thermal environments along the transition from the sub- to the intertidal zone. Corresponding with these differences in vertical zonation are findings that the […]

KHAN, H.R.*; MATSUSHIMA, O.; ALKINDI, A.Y.A.; SALEUDDIN, A.S.M.: Effects of serotonin, FMRFamide-related and vasopressin-related neuropeptides on free amino acid mediated osmoregulation in a pulmonate snail. Osmoregulatory roles of serotonin and FMRFamide-related (FaRPs) in invertebrates have been shown in previous studies. We have studied the effects of serotonin, five FaRPs and three vasopressin-related neuropeptides on free […]

Bernal, D.*; Dickson, K.; Graham, J.: Convergence for high performance swimming in lamnidsharks and tunas. Thermoregulation and metabolic biochemistry. This study documents the shortfin mako shark’s (Isurus oxyrinchus) capacity to thermoregulate and the thermal effects on metabolic enzymes activities and compares the results to tunas. Elasmobranchs and bony fishes have evolved independently for more than […]

HANCOCK, T.V.*; CROCKER, C.E.; GLEESON, T.T.: Contributions to elevated metabolic rates during recovery, the excess post-exercise oxygen consumption (EPOC), in the desert iguana (Dipsosaurus dorsalis). Metabolism remains elevated for some time following vigorous activity in Dipsosaurus. This excess O2 consumption may be quantified as EPOC, a volume of O2 representing metabolic costs of recovery. To […]

PARSONS, J.L.*; HELLGREN, E.C.; LOCHMILLER, R.L. (deceased); LESLIE, D.M., JR.; JORGENSEN, E.E.: Protein nutrition of Southern Plains small mammals: Comparative nitrogen requirements for reproduction Nitrogen nutrition and dynamics in animal communities are of increasing interest, given growing amounts of nitrogen in terrestrial and aquatic systems and the role of nitrogen as an essential nutrient. We […]

MORRIS, K.A.*; KARASOV, W.H.; CAVIEDES-VIDAL, E.: Does digestive physiology limit refueling rates in migratory yellow-rumped warblers (Dendroica coronata)? Smaller guts and slow initial mass gains in migrating birds at stopover sites have led to the idea of a digestive limitation to refueling in migrants. We tested the digestive limitation hypothesis in yellow-rumped warblers using food […]

MCWILLIAMS, S.*; W. KARASOV; J. LEAFLOOR; E. CAVIEDES-VIDAL: Digestive adjustments in geese to reduced forage quality and its ecological implications. When habitat quality on the breeding grounds is poor, arctic-nesting geese must eat foods of lower quality than their preferred foods. We tested the hypothesis that when geese eat foods of lower quality (i.e., higher […]

CAVIEDES-VIDAL,E.; KARASOV,W.H.*: Developmental changes in digestive enzymes of nestling house sparrows, Passer domesticus Six decades of studies have speculated that digestive capacity might limit avian growth rate, or that developmental changes in the gut might determine developmental changes in digestive efficiency. However, there are no studies on digestive biochemistry during avian development, except for studies […]

Buchanan, J. S.*; Cranford, J. A.: Changes in energy utilization, food processing, and gastrointestinal morphology of voles under differing environmental conditions Meadow voles (Microtus pennsylvanicus) are small herbivores that are active year-round, yet have no capacity for torpor. Their food supply, though abundant, may be of low quality when plants undergo winter senescence. Therefore, they […]