Harper, S.L.; Reiber, C.L.: Deviants of gas exchange: adaptations of the tadpole shrimp Tadpole shrimp Triops longicaudatus inhabiting a rock pool in southern Nevada experience prolonged hypoxia. Diel oxygen concentrations (Po2) in the pool range from 0-20 kPa O2. Tadpole shrimp were reared under low (1-3 kPa) and high (10-13 kPa) Po2‘s to determine the […]

TSAI, P.-S.*; MALDONADO, T.A.; PAK, T.R.; ZHANG, L.: Characterization of a Gonadotropin-Releasing Hormone System in an Opisthobranch Mollusk, Aplysia californica Gonadotropin-releasing hormone (GnRH) is a neurohormone crucial for the regulation of reproductive and neural functions in vertebrates. Recent discoveries of GnRH immunoreactivity (IR) in a number of invertebrates raised the possibility that GnRH may be […]

KIRSCHNER, L. B: The Mechanism of Sodium Uptake in Crayfish. Recently, we reported that 3 proton pump inhibitors, known to block Na-H exchange in frog skin had no effect on proton movement and little on Na uptake in tapwater-adapted (TW)crayfish. In contrast, all 3 reduced Na-H exchange in salt-depleted (SD) crayfish. It appeared that the […]

GIBBS, A.G.*; MARRON, M.T.; KAIN, K.J.; ALTHOFF, L.: Mechanisms of water conservation in desert Drosophila. Cactophilic fruitflies from the Sonoran Desert lose water much less rapidly than mesic species. Water is lost by three routes: excretion, cuticular transpiration, and respiration through the spiracles. Excretory losses comprised ~1% of total water loss and did not differ […]

FOLK, D.G.*; BRADLEY, T.J.: Ion Regulation and Water Balance in Drosophila melanogaster Selected for Enhanced Desiccation-Tolerance We are examining physiological processes associated with increased resistance to desiccation in five, replicate populations of Drosophila melanogaster that have undergone laboratory selection for enhanced desiccation-tolerance. For each population of desiccation-resistant flies (D populations), we have maintained a control […]

LI, T.*; ROER, R.D.: Gill Na+, K+-ATPase activity as a function of size and salinity in the blue crab, Callinectes sapidus Juvenile blue crabs (< 25mm carapace width) are found in large numbers in the oligohaline regions of the Cape Fear estuary. Previous work has shown that the juveniles lose Na to the dilute medium […]

FIESS, J.C.*; HUDSON, H.A.; HOM, J.R.; KATO, C.; YANCEY, P.H.: Depth correlations of organic osmolytes in foot and mantle tissues of vesicomyid bivalves Osmoconforming invertebrates such as bivalves use organic osmolytes such as free amino acids to maintain cell volume against the osmotic pressure of seawater. Recent studies have demonstrated that certain osmolytes can also […]

FERRY-GRAHAM, LA; GIBB, AC; California State Univ./Moss Landing Marine Labs; Northern Arizona Univ.: The teleost suction-feeding mechanism: How is it modified for specialized foraging behaviors? Ballistic expansion of the head is used by most aquatic predators to produce suction during prey capture. In this study, we seek to determine if the teleost fishes show variable […]

HIGHAM, T.E.; DAY, S.W.; WAINWRIGHT, P.C.; Univ. of California, Davis; Univ. of California, Davis; Univ. of California, Davis: The effects of swimming speed on suction feeding in bluegill sunfish: flow quantification using Particle Image Velocimetry It is well established that suction feeding fish use a variable amount of swimming (ram) during prey capture. However, the […]

SANFORD, C. P.; WILGA, C. D. *; Hofstra University, Long Island; University of Rhode Island: THE EFFECTS OF SUCTION GENERATION ON PREY CAPTURE IN BAMBOO SHARKS. Suction feeding is the most common means of prey capture in fishes. In contrast to the large body of literature on suction feeding in teleosts, sharks have received little […]