Openly accessible

Covariation in life-history traits : differential effects of diet on condition, hormones, behavior, and reproduction in genetic finch morphs

Pryke, Sarah R., Astheimer, Lee B., Griffith, Simon C. and Buttemer, William A. 2012, Covariation in life-history traits : differential effects of diet on condition, hormones, behavior, and reproduction in genetic finch morphs, American naturalist, vol. 179, no. 3, pp. 375-390.

Attached Files
Name Description MIMEType Size Downloads
astheimer-convariationin-2012.pdf Published version application/pdf 636.55KB 29

Title Covariation in life-history traits : differential effects of diet on condition, hormones, behavior, and reproduction in genetic finch morphs
Author(s) Pryke, Sarah R.
Astheimer, Lee B.
Griffith, Simon C.
Buttemer, William A.
Journal name American naturalist
Volume number 179
Issue number 3
Start page 375
End page 390
Total pages 16
Publisher University of Chicago Press
Place of publication Chicago, Ill.
Publication date 2012-03
ISSN 0003-0147
1537-5323
Keyword(s) hormones
immune function
life-history traits
nutrition
parental care
polymorphism
Summary The relative contribution of genetic and environmental factors in determining variation in life-history traits is of central interest to evolutionary biologists, but the physiological mechanisms underlying these traits are still poorly understood. Here we experimentally demonstrate opposing effects of nutritional stress on immune function, endocrine physiology, parental care, and reproduction between red and black head-color morphs of the Gouldian finch (Erythrura gouldiae). Although the body condition of black morphs was largely unaffected by diet manipulation, red birds were highly sensitive to dietary changes, exhibiting considerable within-individual changes in condition and immune function. Consequently, nutritionally stressed red birds delayed breeding, produced smaller broods, and reared fewer and lower-quality foster offspring than black morphs. Differences in offspring quality were largely due to morph-specific differences in parental effort: red morphs reduced parental provisioning, whereas black morphs adaptively elevated their provisioning effort to meet the increased nutritional demands of their foster brood. Nutritionally stressed genetic morphs also exhibited divergent glucocorticoid responses. Black morphs showed reduced corticosterone-binding globulin (CBG) concentrations and increased levels of free corticosterone, whereas red morphs exhibited reduced free corticosterone levels and elevated CBG concentrations. These opposing glucocorticoid responses highlight intrinsic differences in endocrine sensitivities and plasticity between genetic morphs, which may underlie the morph-specific differences in condition, behavior, and reproduction and thus ultimately contribute to the evolution and maintenance of color polymorphism.
Notes Reproduced with the kind permission of the copyright owner.
Language eng
Field of Research 069999 Biological Sciences not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, The University of Chicago
Persistent URL http://hdl.handle.net/10536/DRO/DU:30046871

Document type: Journal Article
Collections: School of Life and Environmental Sciences
Open Access Collection
Connect to link resolver
 
Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved.

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.

Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 8 times in Scopus
Google Scholar Search Google Scholar
Access Statistics: 84 Abstract Views, 34 File Downloads  -  Detailed Statistics
Created: Mon, 13 Aug 2012, 12:36:40 EST

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.