KELLEY, KM; GALIMA, MM; REYES, JA; SAK, K; SMOLKO, S; BAKER, ME; LOWE, CG; CA State Univ. Long Beach; CA State Univ. Long Beach; CA State Univ. Long Beach; CA State Univ. Long Beach; CA State Univ. Long Beach; Univ. CA San Diego; CA Sate Univ. Long Beach; : Temporal Relationships in the Stress- and […]

WADA, H.; BREUNER, C.W.; WINGFIELD, J.C.; MOORE, I.T.; University of Texas, Austin; University of Texas, Austin; University of Washington; Virginia Polytechnic Institute and State University: Stress responses in equatorial sparrows: comparing tropical and temperate Zonotrichia Comparisons between sister species are useful ways to test the role of environment as a selection pressure shaping the adrenocortical […]

NUNEZ, B. Scott; The University of Texas Marine Science Institute: Stress and reproduction in the Atlantic croaker (Micropogonias undulatus) Steroids are lipophilic hormones that impinge upon virtually every physiological process in vertebrates. The synthesis of the correct type and amount of steroid at the proper time requires the precise regulation of the steroidogenic acute regulatory […]

APPLEBAUM, Scott; NUNEZ, Scott; University of Texas at Austin; University of Texas at Austin: Mechanisms of stress-induced changes in ovarian steroidogenesis in the Atlantic croaker. Stress can rapidly alter plasma sex steroid concentrations in a variety of vertebrates including teleosts. The mechanisms precipitating these changes are unclear; however, a disruption of steroidogenesis is likely involved. […]

BUSCH, D. S. *; BOYD, E.; WINGFIELD, J. C.; University of Washington, Seattle: Chronic, acute pulses of corticosterone alter body condition and timing of molt Corticosterone (B) can be detrimental if it is maintained at or close to maximal stress-induced levels. Animals release high levels of B in response to stressful events and modulate the […]

KITAYSKY, A.S.; IAB and Dept. of Biology and Wildlife, Univ. of Alaska, Fairbanks: Activation and suppression of the adrenal axis in food-limited chicks In several seabirds, nutritional state of a nest-bound chick is negatively correlated with the activity of its hypothalamus-pituitary-adrenal (HPA) axis. Increased corticosterone (cort) secretion has been shown to facilitate changes in behavior […]

STAYTON, C. TRISTAN; Bucknell University: Is convergence surprising? A simulation study using a Brownian motion model of evolution among quantitative characters Convergence, the independent evolution of similar phenotypes among distantly related species, is often taken as evidence of adaptation in response to similar selective pressures. However, some degree of convergence is expected given a large […]

AMUNDSON, R.; Univ of Hawaii at Hilo: Evo-devo�s Hard Problem: Natural Selection Three broad problems faced evo-devo during the 20th century, and two have been solved. The problems were 1) To find a level of description of evolutionary processes that also expressed ontogeny. Heterochrony and allometry were unsuccessful candidates. 2) The dominance of transmission genetics, […]

ARENDT, Jeff; Univ. of California, Riverside: Cell size vs. cell number. Does it matter? Many environmental factors influence realized body size and, all else being equal, organismal size is determined by a combination of cell size and cell number. In some species, temperature is thought to affect body size primarily through cell size while food […]

BABBITT, G.A.*; KILTIE, R.; BOLKER, B.; Univ. of Florida; Florida Fish and Wildlife Conservation Commission; Univ. of Florida: Are fluctuating asymmetry studies adequately sampled? Implications of a new model for size distribution Previous work on fluctuating asymmetry (FA), a measure of developmental instability, has highlighted its controversial relationship with environmental stress and genetic architecture. While […]