Meeting Abstract 20.1  Jan. 5  Patterns of spermatogenesis and steroid hormone levels differ among reproductive phenotypes in bluegill sunfish KNAPP, R.*; NEFF, B.D.; LEARY, C.J.; Univ. of Oklahoma, Norman; Univ. of Western Ontario, London; Univ. of Oklahoma, Norman rknapp@ou.edu In some species, males achieve reproductive success via one of several alternative reproductive tactics. In bluegill sunfish (Lepomis […]

Meeting Abstract 20.4  Jan. 5  Opportunism at work: regulation of the reproductive axis in wild populations of zebra finches. PERFITO, N.*; UBUKA, T.; ZANN, R.A.; HAU, M.; BENTLEY, G.E.; Univ. of California, Berkeley; Univ. of California, Berkeley; LaTrobe Univ., Melbourne, Australia; Princeton Univ., New Jersey; Univ. of California, Berkeley nperfito@berkeley.edu Zebra finches Taeniopygia guttata are thought to […]

Meeting Abstract 20.10  Jan. 5  Neuroendocrine regulation of breeding in white-crowned sparrows (Zonotrichia leucophrys) O’BRIEN, S.*; BENTLEY, G. E.; TSUTSUI, K.; WINGFIELD, J. C.; Univ. of Washington, Seattle; Univ. of California, Berkeley; Hiroshima Univ., Higashi-Hiroshima; Univ. of Washington, Seattle sobrien@u.washington.edu Gonadotropin inhibitory hormone (GnIH) & Kisspeptin (KiSS) are two recently discovered hypothalamic neuropeptides found in a variety […]

Meeting Abstract 20.5  Jan. 5  Isolation of a cDNA encoding a third form of Gonadotropin-Releasing Hormone from the Sea Lamprey Petromyzon marinus KAVANAUGH, S.I.*; SOWER, S.A.; Univ. of New Hampshire, Durham sik@unh.edu As a member of the class Agnatha, sea lampreys, Petromyzon marinus, represent one of the two oldest lineages of vertebrates. Previously, two isoforms of GnRH […]

Meeting Abstract 20.7  Jan. 5  Estradiol induces female receptivity to conspecific calls in the t�ngara frog CHAKRABORTY, M**; BURMEISTER, S. S; University of North Carolina, Chapel Hill; University of North Carolina, Chapel Hill mukta@email.unc.edu Sex steroid hormones play crucial roles in mediating reproductive behaviors. In most vertebrates sex hormones such as estradiol and progesterone induce female receptivity. […]

Meeting Abstract 19.1  Jan. 5  Variation in Gryllotalpa major burrow mouths: Why bother? HILL, PSM*; SHADLEY, JR; Univ. of Tulsa peggy-hill@utulsa.edu Most molecricket males in the Orthopteran family Gryllotalpidae produce sexual advertisement songs from constructed burrows in the soil. The surface openings, or mouths, of the burrows vary in number among species for which they have been […]

Meeting Abstract 19.5  Jan. 5  The effect of hydration state on activity in a free-ranging Sonoran Desert lizard, the Gila Monster, Heloderma suspectum. DAVIS, J.R.**; DENARDO, D.F.; Arizona State University, Tempe j.davis@asu.edu North American deserts can present significant challenges to animals because of variable, often extreme temperatures and limited energy and water resources. Challenges to fundamental physiological […]

Meeting Abstract 19.2  Jan. 5  The consequences of olfaction for predation in a natural stream habitat FERRER, R. P.*; ZIMMER, R. K.; University of California, Los Angeles rferrer@ucla.edu Despite significant advances in understanding the olfactory basis for predatory behavior in laboratory environments, little is known about the sense of smell in natural aquatic habitats. The California newt […]

Meeting Abstract 19.4  Jan. 5  Proceed with caution: invalidating tests of the cost-benefit model of thermoregulation with spatially-explicit movement simulations SEARS, Michael W.; Southern Illinois University msears@zoology.siu.edu The Huey-Slatkin model of behavioral thermoregulation in lizards predicts that individuals should thermoregulate less effectively in costly environments. A recent test of this prediction (Blouin-Demers and Nadeau 2005) used published […]

Meeting Abstract 19.3  Jan. 5  A comparative study of sensory physiology and competitive interactions of the invasive round goby with three native species: slimy sculpin, spoonhead sculpin, and logperch BERGSTROM, MA*; MENSINGER, AF; Univ. of Minnesota Duluth; Univ. of Minnesota Duluth berg1102@d.umn.edu Population declines in native benthic fish populations across the Great Lakes have been attributed to […]