Heritability of corticosterone response and changes in life history traits during selection in the zebra finch

Evans, Matthew R., Roberts, Mark L., Buchanan, Katherine L. and Goldsmith, Arthur R. 2006, Heritability of corticosterone response and changes in life history traits during selection in the zebra finch, Journal of evolutionary biology, vol. 19, no. 2, pp. 343-352.

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Title Heritability of corticosterone response and changes in life history traits during selection in the zebra finch
Author(s) Evans, Matthew R.
Roberts, Mark L.
Buchanan, Katherine L.
Goldsmith, Arthur R.
Journal name Journal of evolutionary biology
Volume number 19
Issue number 2
Start page 343
End page 352
Publisher Wiley - Blackwell Publishing
Place of publication Oxford, England
Publication date 2006-03
ISSN 1010-061X
1420-9101
Keyword(s) artificial selection
corticosterone
heritability
life history traits
stress hormone
testosterone
zebra finch
Summary Vertebrates respond to environmental stressors through the neuro-endocrine stress response, which involves the production of glucocorticoids. We have selected independent, duplicate divergent lines of zebra finches for high, low and control corticosterone responses to a mild stressor. This experiment has shown that over the first four generations, the high lines have demonstrated a significant realized heritability of about 20%. However, the low lines have apparently not changed significantly from controls. This asymmetry in response is potentially because of the fact that all birds appear to be showing increased adaptation to the environment in which they are housed, with significant declines in corticosterone response in control lines as well as low lines. Despite the existence of two- to threefold difference in mean corticosterone titre between high and low lines, there were no observed differences in testosterone titre in adult male birds from the different groups. In addition, there were no consistent, significant differences between the lines in any of the life history variables measured – number of eggs laid per clutch, number of clutches or broods produced per pair, number of fledglings produced per breeding attempt, nor in any of egg, nestling and fledgling mortality. These results highlight the fact that the mechanisms that underlie variation in the avian physiological system can be modified to respond to differences between environments through selection. This adds an additional level of flexibility to the avian physiological system, which will allow it to respond to environmental circumstances.
Language eng
Field of Research 060399 Evolutionary Biology not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2005, European Society for Evolutionary Biology
Persistent URL http://hdl.handle.net/10536/DRO/DU:30020133

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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