Carruth, L.L.*; Jones, R.E.; Norris, D.O.: Stress and pacific salmon: A new look at the role of cortisol in olfaction and home-stream migration Pacific salmon (genus Oncorhynchus) exhibit an interesting and uncommon life-history pattern that combines semelparity, anadromy, and navigation (homing). During smoltification, young salmon imprint on the chemical composition of their natal stream water […]
Archives: Abstracts
Stress & The Augmentation of Immune Function
DHABHAR, F.S.: Stress & The Augmentation of Immune Function Stress may be defined as a sequence of events, that begins with a stimulus (stressor), that is recognized by the brain (stress perception), and which results in the activation of physiologic systems within the body (stress response). Many evolutionary selection pressures are stressors, and one of […]
Social Interaction over Time, Implications for Stress Responsiveness
SUMMERS, CLIFF H: Social Interaction over Time, Implications for Stress Responsiveness Behavioral interaction during social situations is a continuum of action, response, and reaction. The temporal nature of social interaction creates a series of stressful situations, such as aggression, displacement from resources, and the persistent psychological threat accompanying social hierarchy. The ebb and flow of […]
Corticosterone and inclement weather mechanisms underlying adaptive behavioral responses in mountain birds
Breuner, C. W.*; Hahn, T. P.: Corticosterone and inclement weather: mechanisms underlying adaptive behavioral responses in mountain birds. In seasonally-breeding migratory birds, the drive to arrive early and establish a territory on the breeding grounds carries with it the potential benefit of improved reproductive success, but also the risk of encountering potentially life-threatening inclement weather. […]
Ultimate and proximate mechanisms that control the stress-induced inhibition of reproductive behaviors
MOORE, F.L.*: Ultimate and proximate mechanisms that control the stress-induced inhibition of reproductive behaviors. When animals confront harsh or threatening conditions, they frequently respond with rapid changes in behavior, for example, switching from courtship behavior to survival behaviors such as hiding or fleeing. Stress hormones regulate this shift in behavioral state. Behavioral studies in an […]
The Beginnings of the Stress Response Opioid Modulation in Invertebrates
Stefano, G.B.: The Beginnings of the Stress Response: Opioid Modulation in Invertebrates It is evident that chemical signal molecules mediate intercellular communication. During evolution, organisms using this form of communication have increased their chances of survival, passing this trait on to their descendents. Chemical communication exhibits a greater level of sophistication, i.e., synaptic, hormonal. The […]
Stress in Fishes A Diversity of Responses
BARTON, B.A.: Stress in Fishes: A Diversity of Responses Fishes display a wide diversity in their physiological responses to stress. Primary endocrine responses to acute stress include the release of catecholamine and corticosteroid hormones into circulation. Corticosteroids, chiefly cortisol, are released by the interrenal tissue, the adrenal homologue in fish, which is concentrated in the […]
Neurocircuit Regulation of the Hypothalamo-Pituitary-Adrenocortical Axis
Herman, J.P.*; Ziegler, D.R.; Cullinan, W.E.: Neurocircuit Regulation of the Hypothalamo-Pituitary-Adrenocortical Axis Regulation of the hypothalamo-pituitary-adrenocortical (HPA) axis is coordinated by an elaborate neurocircuitry controlling activation of parvocellular neurosecretory neurons resident in the hypothalamic paraventricular nucleus (PVN). Recent studies in our laboratory suggest that neurocircuits controlling HPA axis activity are stressor-specific: rapid responses to physical […]
Evolution of the Corticotropin-Releasing Hormone Signaling System and its Role in Stress-Induced Developmental Plasticity
DENVER, R.J.: Evolution of the Corticotropin-Releasing Hormone Signaling System and its Role in Stress-Induced Developmental Plasticity Post-embryonic development can be strongly influenced by the external environment. Amphibian tadpoles show strong responses to environmental signals, exhibiting continuous variation in the timing of metamorphosis. The most important environmental variable for a tadpole is water availability. We analyzed […]
Endocrine Responses to Unpredictable Environmental Events Stress or Anti-stress Hormones
WINGFIELD, J.C.: Endocrine Responses to Unpredictable Environmental Events: Stress or Anti-stress Hormones? In addition to seasonal changes in morphology, physiology and behavior that occur in predictable annual cycles, there are facultative responses to unpredictable events known as labile (i.e. short-lived) perturbation factors (LPFs). These rapid behavioral and physiological changes have been termed the “emergency” life […]
