CRESPI, E.J.*; DENVER, R.J.; Univ. of Michigan, Ann Arbor; Univ. of Michigan, Ann Arbor: Food restriction during late prometamorphosis alters post-metamorphic growth, feeding behavior, and physiology in Xenopus laevis Studies in mammals have shown that activation of the neuroendocrine stress axis in the fetus or neonate can have profound effects on basal activity and reactivity […]

HATTORI, Tomoko; BREUNER , Creagh W; WILCZYNSKI , Walter ; The University of Texas at Austin ; The University of Texas at Austin ; The University of Texas at Austin : Comparison of total and free steroid hormones in dominant and subordinate male green anole lizards The presence of plasma binding globulins such as corticosterone-binding […]

SMITH, T.M.*; MANZON, R.G.; Univ. of Regina, Saskatchewan, Canada; Univ. of Regina, Saskatchewan, Canada: Cloning and developmental expression of a putative sea lamprey (Petromyzon marinus) transthyretin cDNA. Unlike all other metamorphosing vertebrates, the onset of sea lamprey (Petromyzon marinus) metamorphosis coincides with a rapid drop in total serum thyroid hormone (TH) levels, TH levels remain […]

SHECHTER , A; FREIMAN , A; TOM , M; YUDKOVSKI , Y; CHANG , A.S; CHANG , S.E; SAGI , A*; Ben-Gurion University ; Ben-Gurion University ; Israel Oceanographic and Limnological Research; Israel Oceanographic and Limnological Research; Univ of California, Bodega Marine Laboratory; Univ of California, Bodega Marine Laboratory; Ben-Gurion University ; : An inducible […]

WELCH, KC*; BAKKEN, BH; SUAREZ, RK; Univ. of California, Santa Barbara; Univ. of Wyoming; Univ. of California, Santa Barbara: Use of Dietary Sugar by Hummingbirds as Revealed by Stable Isotope and Respiratory Analysis Hummingbirds are noted for their high foraging frequencies, their primarily nectar-based (sugar) diet, and their capacity to routinely display RQ values near […]

MCWHORTER, T.J.*; HARTMAN BAKKEN, B.; KARASOV, W.H.; MARTINEZ DEL RIO, C.; University of Wisconsin-Madison; University of Wyoming: Hummingbirds fuel high metabolism with both paracellular and carrier-mediated intestinal glucose absorption Twenty years ago, the highest active glucose transport rate and lowest passive glucose permeability in vertebrates were reported in Rufous and Anna�s hummingbirds (Selasphorus rufus, Calypte […]

LAVIN, S.R.*; MCWHORTER, T.J.; KARASOV, W.H.; Univ. of Wisc.; Univ. of Wisc.; Univ. of Wisc.: Differences in paracellular absorption: a function of solvent drag or pore size? Increasing evidence indicates that birds have more extensive intestinal non-mediated, paracellular absorption of hydrosoluble compounds than do mammals. The mechanism(s) underlying this difference has not been studied. More […]

TRACY, C.R.; WOJCIECHOWSKI, M.S.; MCWHORTER, T.J.; YOSEF, R.; KARASOV, W.H.; PINSHOW, B.*; Ben-Gurion University of the Negev, Israel; University of Wisconsin-Madison; International Birding and Research Centre Eliat, Israel: Carbohydrate absorption in migrating blackcaps, upon arrival and after refeeding, at a stopover in southern Israel Small birds in migratory flight catabolize fat and apparently some protein […]

PODLESAK, D. W.*; MCWILLIAMS, S. R.; Univ. of Utah; Univ. of Rhode Island: Birds metabolically route exogenous nutrients to rebuild digestive organs after fasting Many songbirds catabolize their digestive organs and other proteinaceous tissues while fasting during migration. The gut-limitation hypothesis proposes that after arrival at a stopover site songbirds must rebuild digestive organs prior […]

TRACY, C.R.; MCWHORTER, T.J.; KORINE, C.; PINSHOW, B.; KARASOV, W.H.*; Ben-Gurion University of the Negev, Israel; University of Wisconsin-Madison: A mystery solved: how the Egyptian fruit bat absorbs sugar Two decades ago D.J. Keegan reported findings on Egyptian fruit bats (Rousettus aegyptiacus, Megachiroptera) that were mysteriously at odds with the dogma about how glucose is […]