期刊
GENERAL AND COMPARATIVE ENDOCRINOLOGY
卷 197, 期 -, 页码 26-32出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ygcen.2013.11.025
关键词
Baseline CORT; Cortisol; Negative feedback; Stress-induced CORT; The Energy Mobilization Hypothesis; The Preparative Hypothesis
资金
- Sigma Xi
- Tufts University Graduate School
- American Society of Mammalogists
- Animal Behavior Society
- NSF DDIG [IOS-1210492]
- Tufts University International Research Program
- Tufts Institute of the Environment
- NSF [IOS-1048529]
- FONDECYT [1090302]
- Center for the Advanced Studies in Ecology and Biodiversity (CASEB), Program 1
- NSF IRES [OISE-0853719]
- Tufts University Animal Care and Use Committee
- Chilean Servicio Agricola y Ganadero [1-902011, 4731]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1210492, 1048529] Funding Source: National Science Foundation
Many wild animals show seasonal variation in circulating levels of stress hormones. Seasonal changes in the stress response may help animals better cope with the different challenges faced during each life history stage. We determined the seasonal stress profile of wild, free-living degus in Chile. Female degus were sampled during non-breeding (January), mating/early gestation (July), late gestation (August), and lactation (1st litter-September, 2nd litter-January). Male degus were sampled during the first three time-points. We measured baseline cortisol (CORT), stress-induced CORT, and negative feedback efficacy using a dexamethasone suppression test. While we found that neither males nor females showed seasonal variation in baseline CORT or negative feedback levels, we did find significant seasonal variation in stress-induced CORT levels of both sexes. Male stress-induced CORT was lowest during mating while female stress-induced CORT was highest during late gestation and lactation. Overall, females had higher stress-induced CORT compared to males. Our data suggest that stress-induced levels of CORT are highest during periods with increased chance of stressor exposure or times of positive energy balance. Consequently, CORT responses to stress appear to be regulated according to different life history needs. (C) 2013 Elsevier Inc. All rights reserved.
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