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 […]

WALLACE, B.D.*; HAMMER, H.S.; WATTS, S.A.; LAWRENCE, J.M.; LAWRENCE, A.L.: The effects of dietary protein concentration on growth of juveniles of the sea urchin Lytechinus variegatus . Juveniles (ca. 14 mm diameter, n=120) were collected at St. Joseph Bay, FL in March 2000. They were held in 80 L aquaria with artificial seawater at 21 […]

Hammer, H.S.*; Watts, S.A.; Lawrence, J.M.; Lawrence, A.L.; McClintock, J.B.: The effect of dietary protein concentration on gonad composition and gametic condition in the sea urchin Lytechinus variegatus Ecological studies suggest that nutrition, particularly dietary protein, affects nutrient storage and reproductive competency. Starved urchins (ca. 36 mm diameter, n=12) were held in replicated (3x) 80 […]

TELANG, A.*; CHAPMAN, R.F.; WHEELER, D.E.: Sexual differences in protein and carbohydrate utilization by larval tobacco budworm, Heliothis virescens (F.). Female Lepidoptera are often heavier than males, presumably due to greater food consumption. Our previous studies indicated that female Heliothis virescens caterpillars use both feeding and post-ingestive processing as mechanisms to meet nutrient needs. Our […]