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Stopover refueling rate underlies protandry and seasonal variation in migration timing of songbirds

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  • Chad L. Seewagen
  • Christopher G. Guglielmo
  • Yolanda E. Morbey

Abstract

We used plasma metabolite analysis to assess refueling rates of songbirds at stopover sites in New York and test hypotheses that males refuel faster than females during spring (in 2 species), migrants refuel faster during spring than autumn (in 5 species), and adults refuel faster than juveniles during autumn (in 4 species). Model selection based on Akaike’s information criterion indicated that males had higher refueling rates than females during spring in both species tested. Spring migrants had higher refueling rates than autumn migrants in 4 of the 5 species we examined. Juvenile and adult refueling rates during autumn did not differ in any species. Our results indicate that variation in stopover refueling rate can operate as a mechanism for protandry in spring and faster migration during spring than autumn. We found no evidence that juvenile refueling performance during autumn was poorer than that of adults.

Suggested Citation

  • Chad L. Seewagen & Christopher G. Guglielmo & Yolanda E. Morbey, 2013. "Stopover refueling rate underlies protandry and seasonal variation in migration timing of songbirds," Behavioral Ecology, International Society for Behavioral Ecology, vol. 24(3), pages 634-642.
    • Handle: RePEc:oup:beheco:v:24:y:2013:i:3:p:634-642.
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    File URL: http://hdl.handle.net/10.1093/beheco/ars225
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    References listed on IDEAS

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    1. Michael Schaub & Lukas Jenni & Franz Bairlein, 2008. "Fuel stores, fuel accumulation, and the decision to depart from a migration stopover site," Behavioral Ecology, International Society for Behavioral Ecology, vol. 19(3), pages 657-666.
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