Creagh W. Breuner

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Ecological Bases of Hormone-Behavior Interactions : The " Emergency Life History Stage " 1

John C Wingfield, Donna L. Maney, +4 authors Ralph D Richardson
2006

SYNOPSIS. Superimposed upon seasonal changes in morphology, physiology and behavior, are facultative responses to unpredictable events known as labile (i.e., short-lived) perturbation factors (LPFs).… (More)

Plasma binding proteins as mediators of corticosteroid action in vertebrates.

Creagh W. Breuner, Miles Orchinik
The Journal of endocrinology
2002

Stressors elicit a complex but variable suite of endocrine events. Comparative studies of the stress response have focused primarily on the adrenocortical response to stress, in particular the… (More)

In search of relationships between the acute adrenocortical response and fitness.

Creagh W. Breuner, Stephen H Patterson, Thomas P. Hahn
General and comparative endocrinology
2008

The assumption that the acute response to stress is adaptive is pervasive in the literature, but there is little direct evidence regarding potential positive fitness consequences of an acute stress… (More)

Development of stress reactivity in white-crowned sparrow nestlings: total corticosterone response increases with age, while free corticosterone response remains low.

Haruka Wada, Thomas P. Hahn, Creagh W. Breuner
General and comparative endocrinology
2007

Activation of the adrenocortical response to stress during development can have fundamental consequences over the lifetime of the organism; as such, many organisms are less responsive to stress… (More)

Testosterone, corticosterone, and photoperiod interact to regulate plasma levels of binding globulin and free steroid hormone in dark-eyed juncos, Junco hyemalis.

Pierre J Deviche, Creagh W. Breuner, Miles Orchinik
General and comparative endocrinology
2001

The pharmacology and regulation of corticosteroid binding globulins (CBG) in Dark-eyed Juncos, Junco hyemalis, was investigated. The equilibrium dissociation constant for [(3)H]corticosterone (CORT)… (More)

Short-term fasting affects locomotor activity, corticosterone, and corticosterone binding globulin in a migratory songbird

Sharon E. Lynn, Creagh W. Breuner, John C Wingfield
Hormones and Behavior
2003

Unpredictable events such as severe storms lead to an increase in circulating corticosterone (CORT) in breeding birds. This increase is often accompanied by elevations in foraging and irruptive… (More)

Plasma-binding globulins and acute stress response.

Creagh W. Breuner, Sharon E. Lynn, +6 authors Buddy A Whitman
Hormone and metabolic research = Hormon- und…
2006

Within studies of acute stress physiology an increase in glucocorticoid secretion is thought to be the primary mediator of tissue response to stress. Corticosteroid-binding globulin may regulate… (More)

Adrenocortical responses in zebra finches (<ce:italic>Taeniopygia guttata</ce:italic>): Individual variation, repeatability, and relationship to phenotypic quality

Haruka Wada, Katrina G. Salvante, Christine A Stables, Emily Wagner, Tony D Williams, Creagh W. Breuner
Hormones and Behavior
2008

Although individual variation is a key requirement for natural selection, little is known about the magnitude and patterns of individual variation in endocrine systems or the functional significance… (More)

Diel rhythms of basal and stress-induced corticosterone in a wild, seasonal vertebrate, Gambel's white-crowned sparrow.

Creagh W. Breuner, John C Wingfield, L. Michael Romero
The Journal of experimental zoology
1999

Glucocorticoids have a wide array of actions in vertebrates. Daily fluctuations in basal levels of glucocorticoids are thought to regulate homeostatic mechanisms. In contrast, elevated levels… (More)

Seasonal regulation of membrane and intracellular corticosteroid receptors in the house sparrow brain.

Creagh W. Breuner, Miles Orchinik
Journal of neuroendocrinology
2001

A number of studies have demonstrated seasonal regulation of the adrenocortical response to stress, or of corticosteroid binding globulins, but very few studies have examined seasonal regulation of… (More)

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