Allostatic Load in Gambel's White Crowned Sparrow, Zonotrichia leucophrys gambelii: Relationships With Glucocorticoids ...

• Main Authors: Word, Karen R., Austin, Suzanne H., Wingfield, John C.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Zenodo 2022
• Subjects: allostatic load; ambient-temperature; body-mass; corticotropin-releasing-factor; doubly labeled water; endocrine responses; energy expenditure; energy-expenditure; geese branta-leucopsis; glucocorticoid; heart rate; heart-rate; metabolic-rates; oxygen consumption; oxygen-consumption; temperature; Biodiversity; Mammalia; Chiroptera; Chordata; Animalia; bats; bat; Branta leucopsis
• Online Access: https://dx.doi.org/10.5281/zenodo.13537805; https://zenodo.org/doi/10.5281/zenodo.13537805

(Uploaded by Plazi for the Bat Literature Project) Regulation of energetic expenditure in a changing environment, considered here as allostatic load, is central to organism-environment interactions. The value of responses that modify behavior or physiology in coping strategies is often measured in terms of energetic benefits. In this study, the total energetic cost incurred by Gambel's white-crowned sparrows, Zonotrichia leucophrys gambelii, was assessed using heart-rate transmitters. The use of heart rate was validated as a proxy for metabolic rate via flow-through respirometry. Applying heart rate as an indicator of allostatic load, we confirmed that ambient temperature under wintering conditions influences allostatic load. However, baseline corticosterone, proposed to mediate physiological responses to variation in allostatic load, does not appear to vary with heart rate or temperature in captivity, or with temperature under ambient conditions in the field. The relationship between allostatic load and ...