Migratory birds with delayed spring departure migrate faster but pay the costs
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Date
2022-12-01
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Citation of Original Publication
Dossman, B.C., Rodewald, A.D., Studds, C.E. and Marra, P.P. (2022), Migratory birds with delayed spring departure migrate faster but pay the costs. Ecology. Accepted Author Manuscript e3938. https://doi.org/10.1002/ecy.3938
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This is the peer reviewed version of the following article: Dossman, B.C., Rodewald, A.D., Studds, C.E. and Marra, P.P. (2022), Migratory birds with delayed spring departure migrate faster but pay the costs. Ecology. Accepted Author Manuscript e3938. https://doi.org/10.1002/ecy.3938, which has been published in final form at https://doi.org/10.1002/ecy.3938. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Access to this item will begin on 12/01/2024
Access to this item will begin on 12/01/2024
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Abstract
Migratory birds that experience poor overwintering conditions are often late to arrive at the breeding grounds, which is known to depress individual fitness. Despite the importance of this carryover effect, few studies have investigated how individuals can modify migratory behaviors en route to reduce delays on arrival and whether accelerating migration incurs survival costs. To examine this, we used Motus Wildlife Tracking System to track individual American redstarts (Setophaga ruticilla) as they migrated from wintering grounds in Southwest Jamaica through Florida en route to their breeding areas. We leveraged long-term data on spring departure timing and breeding latitude to quantify the relative departure dates (early vs. delayed) of tagged individuals, which we then related to individual migration rates and apparent annual survival. Compared to those initiating migration earlier, individuals that departed relatively late (10-day delay) migrated at a 43% faster rate which decreased their annual survival by 6.3%. Our results are consistent with the hypothesis that spring migrants use speed to compensate for departure delays despite incurring survival costs. This compensatory behavior may potentially underly differential survival during spring migration and may be particularly widespread across short-lived migratory birds generally considered time-constrained