Meeting Abstract S6-2.4  Saturday, Jan. 5  Behavioral and physiological consequences of an audience in the group living cichlid, Astatotilapia burtoni DESJARDINS, J.K.; FERNALD, R.D.; Stanford University; Stanford University In social animals, communication rarely involves only two animals. Rather individuals or groups of animals form an audience within range of the signaler and the receiver. Audience members can […]

Meeting Abstract S6-1.6  Saturday, Jan. 5  NOVEL ASPECTS OF THE GONADOTROPIN-RELEASING HORMONE AXIS IN THREE MODEL CHORDATES. TELLO, J.S.**; ADAMS, B.A.; WU, S; SHERWOOD, N.M.; Univ. of Victoria, British Columbia jtello@uvic.ca In humans, the neurohormone gonadotropin-releasing hormone (GnRH) facilitates reproductive cycling beginning at puberty. GnRH is produced in the hypothalamus and when released, binds to its cognate […]

Meeting Abstract S6-1.4  Saturday, Jan. 5  Mechanisms of Action of Gonadotropin-inhibitory hormone in birds and mammals UBUKA, T*; BENTLEY, GE; Univ. of California, Berkeley ubukat@berkeley.edu Gonadotropin-releasing hormone (GnRH) is one of the primary factors responsible for the hypothalamic control of gonadotropin secretion; gonadotropin inhibitory hormone (GnIH) is another. GnIH homologs are present in the brains of many […]

Meeting Abstract S6-1.3  Saturday, Jan. 5  Gonadotropin-inhibitory hormone: A synopsis BENTLEY, GE*; MCGUIRE, N; CALISI, RM; PERFITO, N; UBUKA, T; UC Berkeley gb7@berkeley.edu Gonadotropin inhibitory hormone (GnIH) was discovered 8 years ago in birds. Its identification raised the possibility that gonadotropin releasing hormone (GnRH) is not the sole hypothalamic neuropeptide that directly influences pituitary gonadotropin release. Our […]

Meeting Abstract S6-1.5  Saturday, Jan. 5  GnRH Peptides and Receptors: The Strange Twists of Evolution SHERWOOD, N.M.; TELLO, J.A.; WU, S.; ADAMS, B.A.; University of Victoria, B.C., Canada; University of Victoria, B.C., Canada; University of Victoria, B.C., Canada; University of Victoria, B.C., Canada Gonadotropin-releasing hormone (GnRH) is a small neuropeptide that initiates a cascade of events resulting […]

Meeting Abstract S6-1.1  Saturday, Jan. 5  Computation meets GnRH neurons: Dynamic current clamping SUTER, Kelly; University of Texas, San Antonio kelly.suter@utsa.edu Gonadotropin releasing hormone (GnRH) neurons form in part, a central neural oscillator that controls sexual reproduction through intermittent release of the GnRH peptide. Activity of GnRH neurons and, by extension release of GnRH has been proposed […]

Meeting Abstract S6-1.2  Saturday, Jan. 5  Computation Meets GnRH Neurons: Compartmental Modeling ROBERTS, Carson B; University of Texas at San Antonio carson.b.roberts@gmail.com Gonadotropin-Releasing Hormone (GnRH) neurons in mice have small somata and exceedingly long dendrites. These morphological characteristics can strongly influence the electrical behavior of GnRH neurons. Thus, changes in dendritic structure can potentially influence hormone secretion. […]

Meeting Abstract S5-2.2  Friday, Jan. 4  Toward a Dynamic Model of Yolk Steroid Deposition and Utilization MOORE, Michael*; JOHNSTON, Gwynne; Arizona State University; Arizona State University michael.moore@asu.edu The discovery by Schwabl that maternal steroid hormones are transferred to the egg yolk and have effects on offspring phenotype revealed a new pathway for non-genetic maternal effects. The initial […]

Meeting Abstract S5-2.1  Friday, Jan. 4  Maternally-derived steroids in amphibian eggs WIDDER, P.D.*; BELDEN, L.K.; Virginia Tech widder@vt.edu Most amphibian eggs differ from bird and reptile eggs by being smaller in size and larger in number. While they share these traits with fish, the cleavage of a newly fertilized amphibian egg is holoblastic, with the yolk completely […]

Meeting Abstract S5-2.3  Friday, Jan. 4  Hormone-mediated Maternal Effects in Birds: Mechanisms GROOTHUIS, T G G *; SCHWABL, H; University of Groningen, NL; Washington State University Pullman, USA t.groothuis@biol.rug.nl Over the past decade birds have proven to be excellent models to study steroid hormone-mediated maternal effects in an evolutionary framework. Most studies focus on the function of […]