Lack of seasonal and moult-related stress modulation in an opportunistically breeding bird: the white-plumed honeyeater (Lichenostomus penicillatus).

Buttemer, William A., Addison, BriAnne A. and Astheimer, Lee B. 2015, Lack of seasonal and moult-related stress modulation in an opportunistically breeding bird: the white-plumed honeyeater (Lichenostomus penicillatus)., Hormones and Behavior, vol. 76, pp. 34-40, doi: 10.1016/j.yhbeh.2015.02.002.

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Title Lack of seasonal and moult-related stress modulation in an opportunistically breeding bird: the white-plumed honeyeater (Lichenostomus penicillatus).
Author(s) Buttemer, William A.
Addison, BriAnne A.
Astheimer, Lee B.
Journal name Hormones and Behavior
Volume number 76
Start page 34
End page 40
Total pages 7
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-11
ISSN 1095-6867
Keyword(s) corticosterone
corticosterone suppression
moult
moult/breeding overlap
opportunistic breeding
stress modulation
white-plumed honeyeater
Summary In most vertebrate species, glucocorticoid levels and stress sensitivity vary in relation to season and life-history stage. In birds, baseline corticosterone (CORT) and stress sensitivity are typically highest while breeding and decrease substantially during moult. Because elevated CORT adversely affects protein synthesis, moult-related CORT suppression is thought to be necessary for forming high-quality feathers. Surprisingly, some passerine species lack moult-related CORT suppression, but these are distinguished by having slow rates of moult and being opportunistic breeders. We examined baseline and stress-induced CORT levels in an opportunistically breeding Australian passerine, the white-plumed honeyeater (Lichenostomus penicillatus). Although this species has a slower moult rate than high-latitiude breeders, it differs little from north-temperate passerines. Neither baseline nor stress-induced CORT levels varied with season (winter, spring or summer), sex or moult status in adult birds. While breeding tended to be highest in early spring through late summer, laparotomies revealed only limited reduction in testicular size in males the year round. In all but one sampling period, at least some females displayed follicular hierarchy. Breeding usually coincides with outbreaks of phytophagous insects, which can happen at any time of the year. This results in moult/breeding overlap when infestations occur in late spring or summer. The ability of this species to moult and breed at the same time while having breeding-levels of CORT demonstrates that CORT suppression is not a prerequisite for synthesis of high-quality feathers. An experimental design incorporating moulting and non-moulting phenotypes is suggested to test the functional significance of CORT suppression in other species.
Language eng
DOI 10.1016/j.yhbeh.2015.02.002
Field of Research 060201 Behavioural Ecology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30070128

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