Individual variation and repeatability of corticosterone responses of little penguins (Eudyptula minor) sampled in two successive years at Oamaru, New Zealand

General and Comparative Endocrinology
J F CockremMurray A Potter

Abstract

Plasma corticosterone concentrations increase when birds experience a stressor, and plasma corticosterone responses to a capture and handling stressor have been measured in many species of birds. Whilst it is assumed that the reported corticosterone responses reflect the inherent sensitivity of each bird to the stressor, responses of the same birds have rarely been measured at intervals of one or more years. The current study was conducted to measure the repeatability in two successive years of corticosterone responses of little penguins (Eudyptula minor) at Oamaru, New Zealand. There was a wide range of individual corticosterone responses to capture and restraint in 96 little penguins in 2012 and 50 penguins sampled at the same time of year in 2013. There were significant repeatabilities for the ranks of corticosterone at 15, 30 and 60min (r=0.416±0.160, r=0.636±0.115 and r=0.380±0.166 respectively) and for the ranks of integrated corticosterone responses (r=0.594±0.126) for 23 birds sampled in both years. There were no significant relationships between the size of corticosterone responses and age, body weight or condition index. Mean corticosterone concentrations at 60min were 114.22±6.65ng/ml in 2012 and 116.94±6.42ng/ml in ...Continue Reading

References

Sep 27, 2001·British Poultry Science·K E Littin, J F Cockrem
Mar 9, 2002·General and Comparative Endocrinology·J F Cockrem, B Silverin
Mar 9, 2002·General and Comparative Endocrinology·J F Cockrem, B Silverin
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Jan 21, 2011·Proceedings. Biological Sciences·Jenny Q OuyangMichaela Hau
Aug 11, 2011·General and Comparative Endocrinology·Travis E WilcoxenStephan J Schoech
Aug 30, 2011·Hormones and Behavior·Jenny Q OuyangFrances Bonier
Jan 10, 2013·General and Comparative Endocrinology·John F Cockrem
Nov 8, 2014·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Thomas W Small, Stephan J Schoech

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Citations

Jun 18, 2016·General and Comparative Endocrinology·Pierre DevicheElodie Carpentier
Feb 20, 2020·Proceedings. Biological Sciences·Kristina B BeckBart Kempenaers

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