Document Detail


Stress in the wild: chronic predator pressure and acute restraint affect plasma DHEA and corticosterone levels in a songbird.
MedLine Citation:
PMID:  22934568     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The effects of chronic stressors on glucocorticoid levels are well described in laboratory rodents, but far less is known about the effects of chronic stressors on wild animals or on dehydroepiandrosterone (DHEA) levels. DHEA can be produced by the adrenal cortex and has prominent antiglucocorticoid properties. Here, we examined wild songbirds to elucidate the relationship between chronic predator pressure and plasma DHEA and corticosterone levels. We measured circulating steroid levels at baseline and after acute restraint, in the breeding and nonbreeding seasons. During the breeding season, males in low predator pressure (LPP) environments had higher baseline DHEA levels than males in high predator pressure (HPP) environments. Also, acute restraint decreased DHEA levels in LPP males only but increased corticosterone levels in HPP and LPP males similarly. During the nonbreeding season, DHEA and corticosterone levels were lower than during the breeding season, and acute restraint decreased DHEA levels in both HPP and LPP males. Unlike males, breeding females showed no effect of predator pressure on baseline DHEA or corticosterone levels. These data suggest that naturalistic chronic and acute stressors affect circulating DHEA and corticosterone levels in wild animals and highlight the importance of using multiple endpoints when studying the physiological effects of chronic stress.
Authors:
Aem Newman; Ly Zanette; M Clinchy; N Goodenough; Kk Soma
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-31
Journal Detail:
Title:  Stress (Amsterdam, Netherlands)     Volume:  -     ISSN:  1607-8888     ISO Abbreviation:  Stress     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-9-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9617529     Medline TA:  Stress     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Graduate Program in Neuroscience, University of British Columbia , Vancouver, British Columbia, V6T 1Z4 , Canada.
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