Journal
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
Volume 278, Issue 1702, Pages 131-137Publisher
ROYAL SOC
DOI: 10.1098/rspb.2010.1220
Keywords
migration; geolocator; neotropical migrant; plasma metabolite; moult
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada
- National Geographic Society
- Molson Foundation
- Natural Environment Research Council [bas010011] Funding Source: researchfish
- NERC [bas010011] Funding Source: UKRI
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Each autumn billions of songbirds migrate between the temperate zone and tropics, but little is known about how events on the breeding grounds affect migration to the tropics. Here, we use light level geolocators to track the autumn migration of wood thrushes Hylocichla mustelina and test for the first time if late moult and poor physiological condition prior to migration delays arrival on the winter territory. Late nesting thrushes postponed feather moult, and birds with less advanced moult in August were significantly farther north on 10 October while en route to the tropics. Individuals in relatively poor energetic condition in August (high beta-Hydroxybutyrate, low triglyceride, narrow feather growth bars) passed into the tropics significantly later in October. However, late moult and poor pre-migratory condition did not result in late arrival on the winter territory because stopover duration was highly variable late in migration. Although carry-over effects from the winter territory to spring migration may be strong in migratory songbirds, our study suggests that high reproductive effort late in the season does not impose time constraints that delay winter territory acquisition.
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