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.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Ninnes CE,Waas JR,Ling N,Nakagawa S,Banks JC,Bell DG,Bright A,Carey PW,Chandler J,Hudson QJ,Ingram JR,Lyall K,Morgan DK,Stevens MI,Wallace J,Möstl Edoi
10.1016/j.ygcen.2011.05.006subject
Has Abstractpub_date
2011-08-01 00:00:00pages
139-47issue
1eissn
0016-6480issn
1095-6840pii
S0016-6480(11)00205-Xjournal_volume
173pub_type
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