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The "Challenge Hypothesis": Theoretical Implications for Patterns of Testosterone Secretion, Mating Systems, and Breeding Strategies
A combination of field and laboratory investigations has revealed that the temporal patterns of testosterone (T) levels in blood can vary markedly among populations and individuals, and even withinExpand
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The concept of allostasis in biology and biomedicine
Living organisms have regular patterns and routines that involve obtaining food and carrying out life history stages such as breeding, migrating, molting, and hibernating. The acquisition,Expand
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SYNOPSIS. Superimposed upon seasonal changes in morphology, physiology and behavior, are facultative responses to unpredictable events known as labile ( i.e. , short-lived) perturbation factorsExpand
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Do baseline glucocorticoids predict fitness?
Baseline glucocorticoid (cort) levels are increasingly employed as physiological indices of the relative condition or health of individuals and populations. Often, high cort levels are assumed toExpand
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Reproduction and Resistance to Stress: When and How
Environmental and social stresses have deleterious effects on reproductive function in vertebrates. Global climate change, human disturbance and endocrine disruption from pollutants are increasinglyExpand
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Actions of glucocorticoids at a seasonal baseline as compared to stress-related levels in the regulation of periodic life processes.
For decades, demands associated with the predictable life-history cycle have been considered stressful and have not been distinguished from stress that occurs in association with unpredictable andExpand
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The Darwinian concept of stress: benefits of allostasis and costs of allostatic load and the trade-offs in health and disease
Why do we get the stress-related diseases we do? Why do some people have flare ups of autoimmune disease, whereas others suffer from melancholic depression during a stressful period in their life? InExpand
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Corticosterone facilitates begging and affects resource allocation in the black-legged kittiwake
Parent black-legged kittiwakes (Rissa tridactyla) and their dependent chicks respond to food shortages by increasing circulating levels of corticosterone. To examine the behavioral significance ofExpand
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Maternal corticosterone is transferred to avian yolk and may alter offspring growth and adult phenotype.
Many environmental perturbations may elevate plasma corticosterone in laying birds, including disease, poor body condition, high predator density, anthropogenic disturbance, and/or food scarcity.Expand
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Dynamics of food availability, body condition and physiological stress response in breeding Black‐legged Kittiwakes
1. The seasonal dynamics of body condition (BC), circulating corticosterone levels (baseline, BL) and the adrenocortical response to acute stress (SR) were examined in long-lived Black-leggedExpand
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