Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 49 for “"Stress hormone."”.
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Abiotic Factors Underlying Stress Hormone Level Variation Among Larval Amphibians
… compositional changes can act as physiological stressors towards system inhabitants. However, little is known about how these altered abiotic factors influence stress hormones (corticosterone) in larval amphibians. Throughout the following chapters, I examined the effects of several abiotic …
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Regulation of elements of the thyroid hormone and corticosteroid systems by stress, hormone treatment, and atrazine during ontogeny of red drum (Sciaenops ocellatus)
… examined the ontogeny of elements of the thyroid hormone (TH) and corticosteroid (CS) systems in red drum (Sciaenops ocellatus). Basal cortisol production was first detected 3 days post-hatch (DPH) and a cortisol stress response was present from 6 DPH forward. Changes in steroidogenic enzyme mRNA …
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Stress in the Red-cockaded Woodpecker: Hormonal Mechanisms of Reproductive Suppression in Helper Males and Impacts of Military Training Activities
The measurement of stress hormone levels in wild free-living animals is becoming an increasingly effective method for examining proximate mechanisms of animal behavior and the physiological impacts of human activities on wildlife. In these studies I measured plasma levels of the stress hormone …
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The Relationship of Dominance, Reproductive State and Stress in a Non-Cooperative Breeder, The Domestic Horse (<em>Equus caballus</em>)
… have shown that subordinates have higher stress hormone levels than dominant individuals (subordinatestress hypothesis). However, in carnivorous animals that are cooperative breeders, displays of aggression are associated with elevated stress hormone levels (dominancestress hypothesis). …
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Are Highways Stressful for Pikas?: Analysis of Stress Hormones of the American Pika (<i>Ochotona princeps</i>) Living Adjacent to Interstate 90 in the Cascade Range of Washington State
… but their fitness in these potentially stressful environments is poorly understood. Chronic stress alters behavior, reduces reproduction, and has been linked to reduced survival. Animals affected by chronic stress in road-adjacent habitats could reduce the ability of wildlife crossing …
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Behavioral and Hormonal Flexibility Across Light Environments in Guppies (Poecilia reticulata)
… correlations between behavior and the androgen hormones testosterone and 11-ketotestosterone?; 5) Are there correlations between behavior and the stress hormone cortisol?; 6) Are there mean level changes in hormone release rates across light environments?; and 7) Is flexibility in hormone …
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Stomatal control during dessication in the resurrection plant Xerophyta humilis
… the effect of exogenous application of the stress hormone ABA on stomatal regulation was followed. X humilis stomatal regulation appears to be initially similar to that typical of desiccation sensitive plants, but differed in that stomata did not all close at once but at a slower rate to …
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Effects of Supplemental Hydration on Physiology and Behavior of Northern Pacific Rattlesnakes (Crotalus oreganus oreganus)
… nature. While it seems intuitive that drought is stressful to animals, studies examining drought are typically observational and fail to assess how the hydration state of these animals influences their physiology and behavior. We tested for an effect of hydration on several physiological and …
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Identification of common and unique stress responsive genes of Arabidopsis thaliana under different abiotic stress through RNA-Seq meta-analysis
Abiotic stress is a major constraint for crop productivity worldwide. To better understand the common biological mechanisms of abiotic stress responses in plants, we performed meta-analysis of 652 samples of RNA sequencing (RNA-Seq) data from 43 published abiotic stress experiments in Arabidopsis …
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ENDOCRINE-MEDIATED ORGANIZATIONAL EFFECTS ON PERSONALITY AND STRESS IN NAZCA BOOBIES
… concentration ([CORT], the primary avian stress hormone), but no change in baseline [CORT] or testosterone, implicating short, but dramatic, hypothalamic-pituitary-adrenal (HPA) axis stress responses in organization of maltreatment behavior. Adult Nazca boobies exhibit personality traits …
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Elucidation of Jasmonate-Responsive Promoter Elements in the Calmodulin-Like Gene CML39 in Arabidopsis
… to effectively respond to biotic and abiotic stress. Calcium ions (Ca2+) have proven to be important components of signaling networks. Observations of stimulus-specific oscillations of cytosolic Ca2+ during signal transduction suggest that Ca2+ signals directly encode information. These …
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New daters’ acute physiological responses to a standardized stressor : do nonadaptive hormone responses forecast romantic breakups?
… on the manner in which individuals respond to stressful situations (Karney & Bradbury, 1995). Research on the link between stress and relationship outcomes has focused almost exclusively on marital relationships. With this in mind, the current study explored associations between general stress …
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From physiology to pixels: Resource allocation tradeoffs and noninvasive technologies for studying marine mammals
… how markers of energy balance and metabolism, stress physiology, and iron mobilization relate to reproductive history to reveal mechanisms governing maternal trade-offs between self-maintenance and reproduction. High-quality females that had consistently higher reproductive output, exhibited …
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Evidence for effects of phoenixin on neurons of the paraventricular nucleus
… eminence and hindbrain, the PVN plays a role in stress response and other autonomic functions. Recent findings have indicated that both phoenixin (PNX), a peptide involved in such responses, and its receptor, GPR173, are expressed throughout the PVN. PNX is thought to sensitize the pituitary …
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The Effects of Acute Psychosocial Stress on Cognitive Performance
… was to examine the effects of acute psychosocial stress on cognitive performance. Psychosocial stress evolves from the perceived presence of a social evaluative threat and results in the activation of the home hypothalamic-pituitary-adrenal axis. As part of this reaction the stress hormone …
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Effects of Maternal Stress and Cortisol Treatment on Offspring Anxiety Behaviour and Stress Responses In Zebrafish (Danio rerio) and Largemouth Bass (Micropterus salmoides)
In fish, maternal stress prior to spawn has been reported to have effects on offspring phenotype. Cortisol, the main glucocorticoid (GC) stress hormone, has been proposed as a potential mediator of such effects because of its organizational role in early teleost development. The present thesis …
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A Glial Role in the Action of Electroconvulsive Therapy
… patients often display high levels of the stress hormone cortisol, and that elevated levels of cortisol have been linked with both hippocampal volume reductions and depression, have lead to the assumption that cortisol may underlie the volumetric changes seen in depressed patients. Support …
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Role of cortisol in social and memory impairments in individuals with velocardiofacial syndrome (VCFS)
… VCFS. There is some evidence to suggest that the stress hormone cortisol contributes to social, cognitive, and communication deficits in related populations (Corbett, Schupp, Levine, & Mendoza, 2009). This study investigated the role that cortisol has on the social and cognitive impairments …
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Unraveling the interaction between hormones and incubation temperature on lizard cognition
… conditions like thermal environments or stress-related hormones can shape cognitive abilities by altering brain physiology or function. Here, I investigated how prenatal thermal environment and corticosterone (CORT) - a key stress hormone in reptiles - affects cognitive development in two …
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Unraveling the interaction between hormones and incubation temperature on lizard cognition
… conditions like thermal environments or stress-related hormones can shape cognitive abilities by altering brain physiology or function. Here, I investigated how prenatal thermal environment and corticosterone (CORT) - a key stress hormone in reptiles - affects cognitive development in two …
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