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1 July 2007 RATES VERSUS COUNTS: FALL MOLTS OF LUCY'S WARBLERS (VERMIVORA LUCIAE)
Sievert Rohwer, Adolfo G. Navarro, Gary Voelker
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Abstract

New specimens from Sinaloa, Mexico, as well as two older specimens, show that both adult and recently fledged Lucy's Warblers (Vermivora luciae) often move far south of their breeding grounds to molt in the tropical deciduous forests of northwestern Mexico. Remarkably, the first preformative (= first prebasic) molt is complete in Lucy's Warblers, including the replacement of flight feathers, primary coverts, and rectrices; thus, previous aging criteria based on the wear and appearance of these feathers are invalid. We suggest that the recent conclusion that Lucy's Warblers molt on their breeding grounds (Voelker and McFarland 2002) is an artifact of more collecting in the southwestern United States than in western Mexico during late summer. An index of relative collecting in Mexico and the United States, as well as data from constant-effort mist netting, suggest that most Lucy's Warblers move south to molt.

Tasas versus Conteos: Mudas de Otoño de Vermivora luciae

Sievert Rohwer, Adolfo G. Navarro, and Gary Voelker "RATES VERSUS COUNTS: FALL MOLTS OF LUCY'S WARBLERS (VERMIVORA LUCIAE)," The Auk 124(3), 806-814, (1 July 2007). https://doi.org/10.1642/0004-8038(2007)124[806:RVCFMO]2.0.CO;2
Received: 11 November 2005; Accepted: 22 June 2006; Published: 1 July 2007
KEYWORDS
aging criteria
collecting effort
Lucy's Warbler
Mexican monsoon
molt migration
Vermivora luciae
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