Meeting Abstract 20.3  Jan. 5  Seasonal components of the reproductive schedules of North American crossbills (Loxia sp.). HAHN, TP*; CORNELIUS, JM; KELSEY, TR; Univ. of California Davis; Univ. of California Davis; Univ. of California Davis tphahn@ucdavis.edu Crossbills have been thought capable of initiating reproduction at any time of year, or maintaining it indefinitely, if food supply permits. […]

Meeting Abstract 20.9  Jan. 5  Range Expansion and Neuroendocrine Modulation in Puget Sound White-Crowned Sparrows (Zonotrichia leucophrys gambelii) DAVIS, J.E.*; ADDIS, E.A.; O’BRIEN, S.; WINGFIELD, J.C.; University of Washington jedavis@u.washington.edu The Puget Sound white-crowned sparrow (Z. l. pugetensis) has a historic breeding distribution limited to the Pacific coast of Oregon and Washington. In contrast, Gambel�s white-crowned sparrows […]

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 20.6  Thursday, Jan. 3  The roles of UDP-glucose-6-dehydrogenase and mshA are responsible for colonization of sepiolid (Cephalopoda: Sepiolidae) light organs. ARIYAKUMAR, D.; NISHIGUCHI, M.K.*; New Mexico State University, Las Cruces donsanji@nmsu.edu Mutualistic associations between the sepiolid squid Euprymna tasmanica (Mollusca: Cephalopoda) and its luminescent bacterium, Vibrio fischeri have been extensively studied as a model to […]

Meeting Abstract 20.3  Thursday, Jan. 3  Scaling pleiotropic effects with organismal complexity WAGNER, GP; KENNEY-HUNT, JP; PAVLICEV, M*; PECK, JR; WAXMAN, D; CHEVERUD, JM; Yale University, New Haven; Washington University, St. Louis; Washington University, St. Louis; University Sussex, Brigton, UK; University Sussex, Brigton, UK; Washington University, St. Louis pavlicev@pcg.wustl.edu Organismal complexity can be defined as the number […]

Meeting Abstract 20.2  Thursday, Jan. 3  Novel functional specificity of HoxA-11 evolves through changes in the transcription factor protein. LYNCH, Vincent/J*; WAGNER, Gunter/P; Yale University; Yale University vincent.j.lynch@yale.edu The evolution of morphological characters is mediated by the evolution of gene regulation. While there is broad agreement for the importance of cis-regulatory evolution, it has only recently been […]