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 […]

BASOLO, A.L.; University of Nebraska-Lincoln: The Effect of Predation on the Evolution of Genetically Linked Life History Traits Adult size is often negatively correlated with the age at which an individual matures, and there are both benefits and costs associated with maturing earlier at a smaller size. Benefits to earlier maturation include a higher probability […]

COLLIN, R; STRI: Sex Ratio and Patterns of Sex Change in Calyptraeid Gastropods The size advantage hypothesis predicts that the optimal size at which an individual should change sex is a function of its size and the size and sex of its potential mates. In species that form small mating groups, variation in group composition […]

MCGOVERN, TM; Dauphin Island Sea Labs: Self-fertilization in the brooding sea anemone Aulactinia incubans Despite the potentially negative consequences (inbreeding depression) associated with inbreeding, self-fertilization in simultaneous hermaphrodites offers various genetic and ecological advantages. Several conditions, including mating between relatives in kin-structured groups, may serve to reduce inbreeding depression and lead to a greater tolerance […]

MCFADDEN, C.S.*; RETTIG, P.M.; BECKMAN, E.J.; Harvey Mudd College: Molecular Evidence for Hybridization Between Two Alcyoniid Soft Coral Species With Contrasting Life Histories Numerous studies have now documented both the potential for and past occurrence of interspecific hybridization events in scleractinian corals and other anthozoan cnidarians. The evolutionary importance of hybridization in these groups is […]

KEEVER, C.C.*; HART, M.W.; Simon Fraser Univ.; Simon Fraser Univ.: Evolution of reproductive mode in asterinid sea stars Asterinid sea stars have evolved diverse modes of reproduction and larval development that include planktonic larval dispersal with suspension feeding (or planktotrophy, the ancestral state for the Asteroidea), brief larval dispersal with non-feeding morphology (lecithotrophy), non-dispersing larval […]