Eeva, T. and Ruuskanen, S and Salminen, J.P. and Belskii, E. and Jarvinen, A. and Kerimov, A. and Korpimäki, E. and Krams, I. and Moreno, J. and Morosinotto, C. and Mänd, R. and Orell, M. and Qvarnström, A. and Siitari, H. and Slater, F.M. and Tilgar, V. and Visser, M.E. and Winkel, W. and Zang, H. and Laaksonen, T. (2011) Geographical trends in the yolk carotenoid composition of the pied flycatcher (Ficedula hypoleuca). Oecologia, 165, 277-287. ISSN 0029-8549.
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Official URL: http://dx.doi.org/10.1007/s00442-010-1772-4
Carotenoids in the egg yolks of birds are considered to be important antioxidants and immune stimulants during the rapid growth of embryos. Yolk carotenoid composition is strongly affected by the carotenoid composition of the female’s diet at the time of egg formation. Spatial and temporal differences in carotenoid availability may thus be reflected in yolk concentrations. To assess whether yolk carotenoid concentrations or carotenoid profiles show any large-scale geographical trends or differences among habitats, we collected yolk samples from 16 European populations of the pied flycatcher, Ficedula hypoleuca.Wefound that the concentrations and proportions of lutein and some other xanthophylls in the egg yolks decreased from Central Europe northwards. The most southern population (which is also the one found at the highest altitude) also showed relatively low carotenoid levels. Concentrations of b-carotene and zeaxanthin did not show any obvious geographical gradients. Egg yolks also contained proportionally more lutein and other xanthophylls in deciduous than in mixed or coniferous habitats. We suggest that latitudinal gradients in lutein and xanthophylls reflect the lower availability of lutein-rich food items in the northern F. hypoleuca populations and in montane southern populations, which start egg-laying earlier relative to tree phenology than the Central European populations. Similarly, among-habitat variation is likely to reflect the better availability of lutein-rich food in deciduous forests. Our study is the first to indicate that the concentration and profile of yolk carotenoids may show large-scale spatial variation among populations in different parts of the species’ geographical range. Further studies are needed to test the fitness effects of this geographical variation.
|Institutes:||Nederlands Instituut voor Ecologie (NIOO)|
|Deposited On:||23 Jan 2011 01:00|
|Last Modified:||15 Nov 2011 11:05|
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