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Interference asymmetries among age-sex classes of rufous hummingbirds during migratory stopovers

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Summary

Three age-sex classes of rufous hummingbirds (Selasphorus rufus) overlap temporally and defend feeding territories during migratory stopovers in the Sierra Nevada of California. We demonstrate that these classes differ in their ability to secure and maintain high-quality feeding territories for refueling, and that these differences result in differences in resource use. Data on acquisition of territories, territory characteristics, and responses of territory owners to intruders suggest that several mechanisms are involved in determining dominance, involving sex- and age-related differences in wing disc loading, coloration, and experience. We discuss the implications of these results for understanding intraspecific variation in migration strategies.

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Correspondence to: F.L. Carpenter

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Carpenter, F.L., Hixon, M.A., Russell, R.W. et al. Interference asymmetries among age-sex classes of rufous hummingbirds during migratory stopovers. Behav Ecol Sociobiol 33, 297–304 (1993). https://doi.org/10.1007/BF00172927

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