AVIS-IBIS

Birds of Indian Subcontinent

Molt and Migration in the Northern Rough-Winged Swallow

Publication Type:Journal Article
Year of Publication:1997
Authors:Yuri, T, Rohwer, S
Journal:The Auk
Volume:114
Issue:2
Date Published:1997
ISBN Number:00048038
Keywords:Gulf of Mexico, Hirundinidae, Hirundo, Hirundo rustica, Mexico, Stelgidopteryx, Stelgidopteryx serripennis
Abstract:We describe the prebasic molt of Northern Rough-winged Swallows (Stelgidopteryx serripennis) using museum specimens. Birds from eastern North America initiate their flight-feather molt about 40 days earlier than birds from west of the Rocky Mountains, suggesting that ecological differences between the two populations affect their molt schedules. In both populations, juveniles start their flight-feather molt 1 to 4 weeks later than adults, but the timing of body molt does not differ for adults and juveniles. Molt occurs simultaneously with the fall migration in both populations. However, eastern birds interrupt their migration when they reach the northern coast of the Gulf of Mexico. Here, they spend about two months finishing their flight-feather molt before crossing the Gulf in October and November. Molt and migration often are concurrent in diurnally migrating swallows, but the two activities do not occur simultaneously when migration must be sustained without interruption.
URL:http://www.jstor.org/stable/4089166
Short Title:The Auk
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