GIBBS, Allen G.; JOHNSON, Robert A.; Univ. of Arizona; Arizona State Univ.: Water balance in seed-harvester ants: effects of mating and a test of the chthonic hypothesis for discontinuous gas exchange The two major routes for water loss from most insects are transpiration through the cuticle and respiratory water loss when the spiracles are open. […]

SELCER, Kyle W.; WILLIAMS, Leslie; SKOLODA, Jamie; Duquesne University: Vitellogenin Induction as a Biomarker for Environmental Estrogens in Xenopus laevis Environmental estrogens pose potential health risks to humans and wildlife by disrupting physiological and developmental processes. Our laboratory has been designing in vivo bioassays for environmental estrogens based on induction of the egg-yolk precursor protein […]

ARENS, J.R.; COOPER, S.J.; Univ. of Wisconsin Oshkosh; Univ. of Wisconsin Oshkosh: Ventilatory Adjustments to Cold Stress in Seasonally Acclimatized House Sparrows Passerines that overwinter in temperate climates undergo seasonal acclimatization that is characterized by metabolic adjustments that may include increased basal metabolic rate (BMR) and cold-induced summit metabolism (Msum) in winter relative to summer. […]

PETERSON, M.R.*; HATCH, K.A.; Brigham Young University; Brigham Young University: Validation of the two-endpoint mixing model to determine diet composition from 13C/12C of breath Stable isotope ratios of carbon are frequently used to determine dietary contribution of two isotopically distinct food sources. While the 13C/12C ratios of specific tissues are often used for such estimates, […]

PODLESAK, D.W.*; MCWILLIAMS, S.R.; University of Rhode Island, Kingston: Using stable isotopes to investigate the effects of diet quality on metabolic routing of dietary nutrients in birds Stable isotopes can be used to quantify the magnitude of metabolic routing of dietary nutrients in birds fed diets of different qualities. We tested two hypotheses: birds fed […]

HAMILTON, J.L.; Brown University, Providence, RI: Three-dimensional kinematics of wing-propelled swimming of the Thick-billed murre (Uria lomvia) Birds of the family Alcidae are capable of both aerial fight and wing-propelled diving. Previous qualitative descriptions of their wing movements while swimming range from underwater “flight” to “rowing”. My study investigates the three-dimensional kinematics of swimming in […]

WANG, G; WARD, P; DANIEL, T; Univ. of Washington: The whorl is greater than the sum of its parameters: A finite element analysis of gastropod shell coiling The fossil record is replete with different gastropod shell morphologies. This extensive paleontological record has contributed a great deal to the understanding of the mode and tempo of […]

IRIARTE-DIAZ, J.*; VASQUEZ, R.A.; BOZINOVIC, F.; Brown University; Universidad de Chile; Pontificia Universidad Catolica de Chile: The trot-gallop transition in a small mammal The transition from trot to gallop in quadruped mammals has been widely hypothesized to be a strategy to minimize the energetic costs of running. Experimental evidence from horses running on treadmills, however, […]

ONKEN, H*; MOFFETT, SB; MOFFETT, DF; Washington State University, Pullman; Washington State University, Pullman; Washington State University, Pullman: The transepithelial voltage of the isolated anterior stomach of mosquito larvae (Aedes aegypti): Characterization of the serotonin-stimulated cells. The lumen-negative transepithelial voltage (Vte) of the isolated and perfused anterior stomach of mosquito larvae (Aedes aegypti) was studied […]

WEIHRAUCH, Dirk; MCNAMARA, John/C; TOWLE, David/W; ONKEN, Horst; Univ. of Osnabrueck, Germany; Univ. de S�o Paulo, S�o Paulo, Brasil; MDIBL, Salsbury Cove, USA, ; Washington State Univ., Pullman, USA : The gills of the red freshwater crab Dilocarcinus pagei: microanatomy, ion-motive ATPases and NaCl absorption The present investigation examines the gills of a true freshwater […]