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1 February 2009 Breeding Biology of the White-Browed Tit-Warbler (Leptopoecile sophiae) in Alpine Shrubs, Southern Tibet
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Abstract
We studied the breeding ecology of the White-browed Tit-Warbler (Leptopoecile sophiae) in the alpine zone of southern Tibet, elevations 4110–4780 m. The earliest breeder among local passerines, the species initiated egg-laying in early April and ended by late July. We located its domed nests in 13 species of shrubs at an average height of 0.9 m (range 0.2–2.5 m) above the ground. Clutch size averaged 4.7 (range 4–6) eggs, declining through the season. Brood size was 4.3 (range 2–6) at hatching and 3.8 (range 1–5) at fledging. Incubation lasted 20.5 (range 16–23) days, and nestlings fledged at 17.5 (range 14–21) days of age, when they were 4% above the adult weight. Of the nests we observed 66% fledged at least one young. Most pairs were monogamous, and both sexes shared all nesting duties. We noted two females attending a single nest, with a brood of normal size, and egg dumping by an additional female. At the population level, the sex ratio of offspring, determined by sexual differences in plumage of nestlings older than 6 days, did not deviate from equality. Birds breeding late in the season, however, tended to raise more females.
© 2009 by The Cooper Ornithological Society. All rights reserved. Please direct all requests for permission to photocopy or reproduce article content through the University of California Press's Rights and Permissions website, http://www.ucpressjournals.com/reprintInfo.asp.
Xin Lu, Guohong Gong, Ma Xiaoyan and Dianhua Ke "Breeding Biology of the White-Browed Tit-Warbler (Leptopoecile sophiae) in Alpine Shrubs, Southern Tibet," The Condor 111(1), (1 February 2009). https://doi.org/10.1525/cond.2009.080041
Received: 25 September 2008; Accepted: 1 November 2008; Published: 1 February 2009
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