NORTHCUTT, R.G.; University of California, San Diego: External taste buds in channel catfish are not neurally induced The predominant theory of taste bud induction has been the neural induction theory, according to which the peripheral processes of the facial, glossopharyngeal and vagal nerves invade the oropharyngeal epithelium and induce taste bud primordia. There is growing […]

SERRANO, X.; GARCIA, M.M.; VEILLETTE, P.A.; SPECKER, J.L.; University of Rhode Island: Cortisol regulation in larval summer flounder (Paralichthys dentatus) In teleosts, cortisol is primarily produced in the diffuse interrenal tissue and circulating levels are regulated through feedback inhibition on the hypothalamus and pituitary. However, it is not clear when auto-regulation of the hypothalamic-pituitary-interrenal (HPI) […]

WADA, H.*; HAHN, T.P.; BREUNER, C.W.; Univ. of Texas at Austin; Univ. of California, Davis; Univ. of Texas at Austin: Ontogenetic pattern of intracellular corticosteroid receptors in white-crowned sparrow nestling brain During the first stages of life, some species show a lack of reactivity to various stressors, failing to elicit glucocorticoid secretion. This is called […]

MACDOUGALL-SHACKLETON, SA*; MACDONALD, IF; KEMPSTER, B; ZANETTE, L; Univ. of Western Ontario; Univ. of Western Ontario; Univ. of Western Ontario; Univ. of Western Ontario: Nutritional stress, brain development and song repertoires in song sparrows The developmental stress hypothesis posits a mechanism by which birdsong can be maintained as an indicator of male quality. HVC, a […]

FOLK, Donna G.*; GILCHRIST, George W.; The College of William and Mary; The College of William and Mary: Heat-Shock Response and Locomotory Performance in Drosophila Populations Selected for Divergent Knockdown Temperatures The thermal environment has a critical influence on the physiological performance of all organisms. To study the impact of temperature change on performance, we […]

WALKER, B.G.*; MATT, K.S.; Gonzaga University, Spokane, WA; Arizona State University, Tempe: Baseline and stress induced corticosterone levels in female and male Siberian hamsters depends on pairing type and parental status The Siberian hamster, Phodopus sungorus, forms loose monogamous pairs during breeding. However, it appears that females provide the majority of the parental care � […]

HORTON, B.M.*; LONG, J.A.; HOLBERTON, R.L.; University of Maine, Orono: A possible role of corticosterone in mediating transitions from migration to breeding in male White-throated Sparrows (Zonotrichia albicollis). Corticosterone plays an important role in both migratory preparation and refueling during stopover. Little is known, however, about how birds balance the competing energetic demands of recovering […]

Meeting Abstract 20.6  Jan. 5  Temporal effects of testosterone treatment on song control region growth in adult male House Finches STRAND, C.R.*; DEVICHE, P.; Arizona State University, Tempe christy.strand@asu.edu In adult male songbirds, increases in circulating testosterone (T) levels and singing behavior induce the growth of specific brain regions that control singing behavior (song control regions; SCRs). […]

Meeting Abstract 20.2  Jan. 5  Seasonal variation in the endocrine regulation of aggressive behavior in a sedentary tropical bird HAU, M*; BEEBE, K; CANOINE, V; SCHLINGER, BA; Princeton University hau@princeton.edu Evidence is accumulating from studies in temperate-zone male vertebrates that the endocrine regulation of aggressive territorial behavior differs seasonally. During the breeding season a combination of androgenic […]

Meeting Abstract 20.8  Jan. 5  Seasonal social modulation of testosterone in the Costa Rican rufous-collared sparrow (Zonotrichia capensis costaricensis) ADDIS, E. A.*; BUSCH, D. S.; CLARK, A. D.; WINGFIELD, J. C.; University of Washington; University of Washington; University of Washington; University of Washington addise@u.washington.edu Previous work has shown that birds breeding in northern temperate regions adjust production […]