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Type: Journal article
Title: Environmental influences on Adelie penguin breeding schedules, endocrinology, and chick survival
Author: Ninnes, C.
Waas, J.
Ling, N.
Nakagawa, S.
Banks, J.
Bell, D.
Bright, A.
Carey, P.
Chandler, J.
Hudson, Q.
Ingram, J.
Lyall, K.
Morgan, D.
Stevens, M.
Wallace, J.
Mostl, E.
Citation: General and Comparative Endocrinology, 2011; 173(1):139-147
Publisher: Academic Press Inc Elsevier Science
Issue Date: 2011
ISSN: 0016-6480
Statement of
C.E. Ninnes, J.R. Waas, N. Ling, S. Nakagawa, J.C. Banks, D.G. Bell, A. Bright, P.W. Carey, J. Chandler, Q.J. Hudson, J.R. Ingram, K. Lyall, D.K.J. Morgan, M.I. Stevens, J. Wallace, E. Möstl
Abstract: To understand how the social and physical environment influences behaviour, reproduction and survival, studies of underlying hormonal processes are crucial; in particular, interactions between stress and reproductive responses may have critical influences on breeding schedules. Several authors have examined the timing of breeding in relation to environmental stimuli, while others have independently described endocrine profiles. However, few studies have simultaneously measured endocrine profiles, breeding behaviour, and offspring survival across seasons. We measured sex and stress hormone concentrations (oestrogens, testosterone, and corticosterone), timing of breeding, and chick survival, in Adelie penguins (Pygoscelis adeliae) at two colonies in two different years. Clutch initiation at Cape Bird South (CBS; year 1, ~14,000 pairs) occurred later than at Cape Crozier East (CCE; year 2, ~ 25,000 pairs); however, breeding was more synchronous at CBS. This pattern was probably generated by the persistence of extensive sea ice at CBS (year 1). Higher corticosterone metabolite and lower sex hormone concentrations at CBS correlated with later breeding and lower chick survival compared to at CCE - again, a likely consequence of sea ice conditions. Within colonies, sub-colony size (S, 50-100; M, 200-300; L, 500-600; XL, >1000 pairs) did not influence the onset or synchrony of breeding, chick survival, or hormone concentrations. We showed that the endocrine profiles of breeding Adelie penguins can differ markedly between years and/or colonies, and that combining measures of endocrinology, behaviour, and offspring survival can reveal the mechanisms and consequences that different environmental conditions can have on breeding ecology.
Keywords: Adelie penguin; Breeding schedules; Corticosterone; Testosterone; Oestrogens; Sea ice
Rights: Copyright © 2011 Elsevier Inc. All rights reserved.
RMID: 0020111138
DOI: 10.1016/j.ygcen.2011.05.006
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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