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Is Behavioral Variation along the Bold-Shy Continuum Associated with Variation in the Stress Axis in Zebrafish? *.
MedLine Citation:
PMID:  23099468     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Abstract We tested whether boldness is associated with attenuation of the physiological stress response in behaviorally selected lines of zebrafish Danio rerio. We measured three component behaviors of boldness: cortisol levels under control and stressed conditions, growth rate, and expression of key genes linked to the hypothalamic-pituitary-interrenal axis in the brain. Surprisingly, bold animals did not differ from shy animals with respect to cortisol levels. However, significant differences between these animals in the expression of glucocorticoid receptors and genes that regulate production of stress hormones indicate that there may still be a relationship between bold behavior and the stress axis. Perhaps the most surprising result of this study was the degree of sexual dimorphism: female zebrafish were bolder than male zebrafish, had significantly lower levels of cortisol, and differed significantly in the expression of several genes in the brain. Our data indicate that a bold behavioral type is associated with transcriptional attenuation of stress axis genes, but we do not yet know whether evolution along the bold-shy continuum is attributable to genetic changes in the stress axis. The bold and shy zebrafish lines will be valuable tools for additional research into the relationship between stress and behavior and the mechanisms regulating sexual dimorphism in these traits.
Authors:
Mary E Oswald; Robert E Drew; Matt Racine; Gordon K Murdoch; Barrie D Robison
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Publication Detail:
Type:  Journal Article     Date:  2012-10-11
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  85     ISSN:  1537-5293     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:    2012 Nov-Dec
Date Detail:
Created Date:  2012-10-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883369     Medline TA:  Physiol Biochem Zool     Country:  United States    
Other Details:
Languages:  eng     Pagination:  718-28     Citation Subset:  IM    
Affiliation:
Department of Biological Sciences, University of Idaho, Moscow, Idaho 83844; 2Department of Biology, University of Massachusetts Dartmouth, North Dartmouth, Massachusetts 02747; 3Department of Animal and Veterinary Science, University of Idaho, Moscow, Idaho 83844.
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