| endocrine, metabolic, and behavioral effects of and recovery from acute stress in a free-ranging bird. | acute stress in vertebrates generally stimulates the hypothalamo-pituitary-adrenal axis and is often associated with multiple metabolic changes, such as increased gluconeogenesis, and with behavioral alterations. little information is available, especially in free-ranging organisms, on the duration of these reversible effects once animals are no longer exposed to the stressor. to investigate this question, we exposed free-ranging adult male rufous-winged sparrows, peucaea carpalis, in breeding c ... | 2016 | 27311790 |
| the seasonal glucocorticoid response of male rufous-winged sparrows to acute stress correlates with changes in plasma uric acid, but neither glucose nor testosterone. | we sought to clarify functional relationships between baseline and acute stress-induced changes in plasma levels of the stress hormone corticosterone (cort) and the reproductive hormone testosterone (t), and those of two main metabolites, uric acid (ua) and glucose (glu). acute stress in vertebrates generally stimulates the secretion of glucocorticoids, which in birds is primarily cort. this stimulation is thought to promote behavioral and metabolic changes, including increased glycemia. however ... | 2016 | 27292791 |
| regulation of plasma testosterone, corticosterone, and metabolites in response to stress, reproductive stage, and social challenges in a desert male songbird. | in many male vertebrates, the secretion of reproductive (gonadal androgens) and adrenocortical (glucocorticoids) hormones varies seasonally and in response to environmental stimuli, and these hormones exert numerous behavioral and metabolic effects. we performed two field studies on adult male rufous-winged sparrows, peucaea carpalis, a sonoran desert rain-dependent sedentary species, to (a) determine seasonal changes in initial (baseline) and acute stress-induced plasma testosterone (t), cortic ... | 2014 | 24518569 |
| rapid stress-induced inhibition of plasma testosterone in free-ranging male rufous-winged sparrows, peucaea carpalis: characterization, time course, and recovery. | chronic stress generally inhibits the activity of the reproductive system. acute stress also is often inhibitory, but the mechanism involved and its persistence of action once animals are no longer exposed to the stressor are poorly understood. we investigated the effect of capture and restraint stress on plasma testosterone (t), luteinizing hormone (lh), and corticosterone (cort) in free-ranging male rufous-winged sparrows, peucaea carpalis. stress decreased plasma t between 10 and 30 min after ... | 2012 | 22449619 |