An experimental examination of interindividual variation in feather corticosterone content in the house sparrow, Passer domesticus in southeast Australia

Aharon-Rotman, Yaara, Buchanan, Katherine, Klaassen, Marcel and Buttemer, William 2017, An experimental examination of interindividual variation in feather corticosterone content in the house sparrow, Passer domesticus in southeast Australia, General and comparative endocrinology, vol. 244, pp. 93-100, doi: 10.1016/j.ygcen.2015.12.010.

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Title An experimental examination of interindividual variation in feather corticosterone content in the house sparrow, Passer domesticus in southeast Australia
Author(s) Aharon-Rotman, Yaara
Buchanan, KatherineORCID iD for Buchanan, Katherine
Klaassen, MarcelORCID iD for Klaassen, Marcel
Buttemer, William
Journal name General and comparative endocrinology
Volume number 244
Start page 93
End page 100
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2017-04-01
ISSN 1095-6840
Keyword(s) Avian
Stress response
Science & Technology
Life Sciences & Biomedicine
Endocrinology & Metabolism
Summary Non-invasive techniques for measuring glucocorticoids (GCs) have become more prevalent, due to the advantage of eliminating the effects of animal disturbance on GC levels and their potential to provide an integrated, historic estimate of circulating GC levels. In the case of birds, corticosterone (CORT) is deposited in feathers, and may reflect a bird's GC status over the period of feather synthesis. This technique thus permits a retrospective view of the average circulating GC levels during the moult period. While it is generally assumed that differences in feather CORT content (CORTf) between individuals reflects their different stress histories during either natural or induced moult, it is not clear how much of this variation is due to extrinsic versus intrinsic factors. We examined this question by determining CORTf in free-living house sparrows (Passer domesticus) from two populations, one urban and the other rural, that were plucked before and after exposure to different plasma CORT levels while held captive. We experimentally manipulated plasma CORT by implanting birds with either a corticosterone-filled, metyrapone-filled, or empty ('sham') silastic capsule as replacement feathers first emerged. The pattern of post-treatment CORTf was consistent with our expectations, based on plasma CORT levels of an experimentally implanted reference group. However, there was no statistically significant difference in CORTf between these treatment groups unless sex, population origin, and CORTf of original feathers for each individual were included in a model. Thus, birds with higher CORTf in feathers removed for this experiment tended to have higher CORTf in post-treatment replacement feathers, irrespective of treatment. In addition, we found that feather fault bar scores were significantly higher in CORT-treated birds than in the other two treatment groups, but did not vary directly with CORTf level. Our study therefore broadly confirms the use of feathers as a non-invasive tool to estimate plasma CORT during moult in birds, but importantly demonstrates the potential for intrinsic differences in stress characteristics between populations and individuals to obscure the effects extrinsic stressors might have on CORTf.
Language eng
DOI 10.1016/j.ygcen.2015.12.010
Field of Research 060603 Animal Physiology - Systems
060801 Animal Behaviour
0608 Zoology
0606 Physiology
0707 Veterinary Sciences
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
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