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http://dx.doi.org/10.5352/JLS.2009.19.1.058

Molting Patterns of Flight Feathers of Immature Steller's Sea Eagle(Haliaeetus pelagicus) Raised in Captivity  

Kang, Seung-Gu (Department of Biology, Graduate School, Kyungsung University)
Lee, In-Sup (Department of Biology, Kyungsung University)
Publication Information
Journal of Life Science / v.19, no.1, 2009 , pp. 58-64 More about this Journal
Abstract
This study was conducted to know the molting sequence and the aging points of flight feathers of steller's sea eagles (Haliaeetus pelagicus). For this study, two captive immature steller's sea eagles raised at the Ornithology Laboratory attached to Kyungsung University were surveyed for five years from Nov. 2000 to Nov. 2005. The survey indicated that the first molting began in July of the second year, and the primaries of P1-3, the secondaries of S18-19 (female), S17-18 (male), and S1 and S4 were replaced by one-time with second generation feathers. Generally molting stopped during the winter period, but a few feathers continued to molt during the winter. The two secondaries of S18-19 (female) and S17-18 (male) always molted every year but some of the juvenile secondaries (male: S10, S11, etc) retained for 2 or 3 years. In the molting order of primaries, the first molting started at P1 and it proceeded to P10 of outside. In the secondaries, the first molting started at S17(male) and S19(female), and it proceeded to outside. After that molting it started at S1 and proceeded to inside. In the other secondaries, the pattern of molting which proceeded in the mid-part of the secondaries was usually beginning in several different points at the same time. The molting seemed as if it depends on both the conditions of the individuals and the environment, so it was very difficult to explain the molting pattern in the mid-part of the secondaries. The longer quills (P7, P8) required for more than 68 days to develop. In the comparison of the length in the remiges between the first and the second generation feathers, the first generation feathers were the larger than that of the second. And the reduction of the length between the second and the third generation feathers was a few. The reduction of the length between the third and the fourth generation feathers was slight. The juvenile primaries were dark brown with a whitish base, which could be observed until the second or the third generation feathers (in their third or fourth winter plumage).
Keywords
Molting sequence; aging point; flight feathers; steller's sea eagle; generation feathers;
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  • Reference
1 Miller, A. H. 1941. The significance of molt centers among the secondary remiges in the Falconiforms. The Condor 43, 113-115   DOI   ScienceOn
2 Morioka, T. 2000. Aging by molt patterns of flight feathers of non adult Steller's Sea Eagle. The First Symposium on Steller's and White-tailed Sea Eagles in East Asia, pp. 11-16, Wild Bird Society of Japan, Tokyo
3 Olsen, K. M. and H. Larsson. 2003. Gulls of North America, Europe and Asia, pp. 608, Princeton, New Jersey
4 Potapov, E., I. Utekhina. and M. J. Mcgrady. 2000. Steller's Sea Eagle in Magadan District and in the North of Khabarovsk District, The First Symposium on Steller's and White-tailed Sea Eagles in East Asia, pp. 29-44, Wild Bird Society of Japan, Tokyo
5 Sibley, D., C. Elphick. and J. B. Dunning, JR. 2001. The Sibley Guide to Bird Life and Behaviour, pp. 588, Helm, London
6 Spofford, W. R. 1946. Observations on two Golden Eagles. The Auk 63, 85-87
7 Svensson, L. 1992. Identification Guide to European Passerines, pp. 587, British Trust for Ornithology, Stockholm
8 Watson, J. 1997. The Golden Eagle, pp. 374, T. & A. D. Poyser, London
9 Zuberogoitia, I., J. A. Martinez, Jabiala, J. E. Martinez, I. Castillo, A. Azkona and S. Hidalgo. 2005. Sexing, aging and moult of Buzzards Buteo buteo in a southern European area. Ringing & Migration 22, 153-158   DOI   ScienceOn
10 Amadon, D. 1966. Avian plumages and moults. The Condor 68, 263-278   DOI   ScienceOn
11 Baker, K. 1993. Identification Guide to Non-Passerines (BTO Guid 24ed.). pp. 332, British Trust for Ornithology, London
12 Bond, R. M. and R. M. Stabler. 1941. Second-year plumage of the Goshawk. The Auk 58, 346-349   DOI
13 Brommer, J., O. Pihlajamaki, H. Kolunen and H. Pietiainen. 2003. Life-history consequences of partial-moult asymmetry. Journal of Animal Ecology 72, 1057-1063   DOI   ScienceOn
14 Edelstam, C. 1984. Patterns of moult in large birds of prey. Ann. Zool. Fennici 21, 271-276
15 Jollie, M. 1947. Plumage changes in the Golden Eagle. The Auk 64, 549-576   DOI
16 Forsman, D. 1999. The Raptors of Europe and the Middle East, pp. 589, T. & A. D. Poyser, London
17 Ginn, H. B. and D. S. Melville. 2000. Moult in birds (19th ed.), pp. 112, British Trust for Ornithology, Norwich