MORPHOLOGICAL VARIATION IN WING-MOULTLNG SOUTH AFRICAN SHELDUCKS
作者:
J.N. Geldenhuys,
期刊:
Ostrich
(Taylor Available online 1983)
卷期:
Volume 54,
issue 1
页码: 19-25
ISSN:0030-6525
年代: 1983
DOI:10.1080/00306525.1983.9634438
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Geldenhuys, J. N. 1983. Morphological variation in wing-moulting South African Shelducks.Ostrich54:19-25. Male and female South African ShelducksTadorna canalose 25,6 and 28,2% of their pre-moult weight during the flightless period. Juveniles (3–5 months old) do not take part in the wing-moult aggregation. Subadults (15–17 months old) cannot be distinguished from older birds in wing-moulting populations on the basis of the bursa of Fabricius, penis structure, colour of the wing feathers, foot colour and the size of the culmen and tarsus. It is suggested that the catabolism of body tissue during wing-moult has little effect on the survival of the species.
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