Article (Scientific journals)
Extreme intra-clutch egg size dimorphism is not coupled with corresponding differences in antioxidant capacity and stable isotopes between eggs
Poisbleau, Maud; Beaulieu, Michaël; Dehnhard, Nina et al.
2017In Comparative Biochemistry and Physiology. Part A, Molecular and Integrative Physiology, 205, p. 77-85
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Keywords :
Antioxidant capacity; Crested penguins; Female condition; Maternal transfer; Oxidative status; Stable isotope
Abstract :
[en] Oviparous females need to allocate resources optimally to their eggs in order to maximize their fitness. Among these resources, dietary antioxidants, acquired by females and transferred to the eggs during egg formation, can greatly affect the development and survival of the embryo and chick. In crested penguins, incubation starts after the second and last egg is laid and, as opposed to many other bird species, this egg hatches first, thereby enhancing the survival of the chick. Here, we assessed whether antioxidant and isotopic composition could underlie these differences between eggs within clutches of southern rockhopper penguins (Eudyptes chrysocome chrysocome). The second-laid egg had higher total antioxidant capacity than the first-laid egg, although this was not due to higher antioxidant concentration but to its higher mass. This suggests that resources are allocated by females at a constant rate in both eggs within clutches. Accordingly, we found a strong correlation for isotopic compositions between eggs suggesting that resources were allocated similarly to each egg within the clutch. Overall, we found little evidence for a significant role of antioxidant and isotopic compositions to explain differences in terms of embryo/chick development between eggs in crested penguins. However, since our results suggest a constant rate of antioxidant transfer from females to eggs, limiting the mass of the first-laid egg might represent a strategy for females to spare antioxidant defences and preserve self-maintenance.
Research center :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Environmental sciences & ecology
Zoology
Author, co-author :
Poisbleau, Maud;  Universiteit Antwerpen - UA > Department of Biology > Behavioural Ecology & Ecophysiology Group
Beaulieu, Michaël;  University of Greifswald > Zoological Institute and Museum
Dehnhard, Nina;  Universiteit Antwerpen - UA > Department of Biology > Behavioural Ecology & Ecophysiology Group
Demongin, Laurent;  Universiteit Antwerpen - UA > Department of Biology > Behavioural Ecology & Ecophysiology Group
Lepoint, Gilles  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Sturaro, Nicolas ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Eens, Marcel;  Universiteit Antwerpen - UA > Department of Biology > Behavioural Ecology & Ecophysiology Group
Language :
English
Title :
Extreme intra-clutch egg size dimorphism is not coupled with corresponding differences in antioxidant capacity and stable isotopes between eggs
Publication date :
2017
Journal title :
Comparative Biochemistry and Physiology. Part A, Molecular and Integrative Physiology
ISSN :
1095-6433
eISSN :
1531-4332
Publisher :
Elsevier, Netherlands
Volume :
205
Pages :
77-85
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Grant numbers 1.2.619.10.N.00, 1.5.020.11.N.00
Funders :
UA - University of Antwerp [BE]
FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen [BE]
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