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1 February 2000 BODY WEIGHT AND FEATHER GROWTH OF MALE BARROW'S GOLDENEYE DURING WING MOLT
Debbie van de Wetering, Fred Cooke
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Abstract

We studied the timing, duration, and rate of wing molt of male Barrow's Goldeneye (Bucephala islandica). The mean daily change in primary feather length was 2.6%, which is consistent with rates reported for other waterfowl species. The mean length of the flightless period was 31 days (range: 27–34 days), excluding the pre-shedding interval. Wing molt extended from early July to mid-September. Peak wing molt occurred between 20 July and 23 August. The mean body weight of adult males decreased significantly during wing molt. Heavier birds had greater remigial growth rates and experienced more substantial declines in body weight than lighter birds, suggesting that body reserves may be used to increase the rate of remigial growth.

Debbie van de Wetering and Fred Cooke "BODY WEIGHT AND FEATHER GROWTH OF MALE BARROW'S GOLDENEYE DURING WING MOLT," The Condor 102(1), 228-231, (1 February 2000). https://doi.org/10.1650/0010-5422(2000)102[0228:BWAFGO]2.0.CO;2
Received: 13 April 1999; Accepted: 1 October 1999; Published: 1 February 2000
KEYWORDS
Barrow's goldeneye
Bucephala islandica
molt strategies
nutrient reserves
remigial growth rate
wing molt
Yukon
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