期刊
HORMONES AND BEHAVIOR
卷 59, 期 4, 页码 497-502出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.yhbeh.2011.01.010
关键词
Glucocorticoids; Stress response; Repeatability; Hypothalamic-pituitary-adrenal axis; Physiological phenotype; Florida scrub-jay
资金
- NSF [IBN-0346328, IOS-0919899]
- Sigma Xi
- American Ornithologists' Union
- Society for Integrative and Comparative Biology
- University of Memphis Ecological Research Center
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0919899] Funding Source: National Science Foundation
Recent studies have posited that the pattern of glucocorticoid secretion within an individual represents a stable, fixed physiological trait To test this hypothesis, we assessed the repeatability of baseline and stress-induced corticosterone (CORT) secretion across developmental stages and years in Florida scrub-jays. We sampled individuals from multiple cohorts repeatedly from the age of 11 days post-hatch up to 4 years of age. We found a significant degree of repeatability within individuals in stress-induced corticosterone levels, i.e., the amount of hormone secreted during a standardized stress protocol (corrected integrated corticosterone). However, baseline corticosterone levels were not statistically repeatable, although there was some indication that nestling levels predicted levels at 1 year of age. The results of this study indicate that stress-induced CURT levels are consistent within individual scrub-jays, and the degree to which a young jay mounts an acute stress response appears to be somewhat set by the age of nutritional independence. Thus stress-induced corticosterone secretion appears to be a stable, repeatable trait within individuals and as such may be subject to natural selection. (C) 2011 Elsevier Inc. All rights reserved.
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