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Territory dynamics in a sage sparrow population: are shifts in site use adaptive?

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Summary

In 1981–1985, we studied territory dynamics in a southeastern Idaho sage sparrow population to evaluate the hypothesis that territory shifts represent adaptive adjustments in site use. We predicted that shifts should (1) result in changes in territory characteristics, (2) be influenced by previous reproductive success and result in greater success, and (3) decline in magnitude for individual males over time. Habitat features of territories changed little as a result of shifts, but territory size increased. Correspondingly, habitat features of territories were unrelated to reproductive success, whereas territory size was positively related. The magnitude of territory shifts was negatively correlated with preshift fledging success, and after shifts, males experienced greater average reproductive success than before. Successive territory shifts by individual males became progressively smaller. Thus, territory shifting by sage sparrows seems to be adaptive behavior aimed primarily at increasing territory size.

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Petersen, K.L., Best, L.B. Territory dynamics in a sage sparrow population: are shifts in site use adaptive?. Behav Ecol Sociobiol 21, 351–358 (1987). https://doi.org/10.1007/BF00299929

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  • DOI: https://doi.org/10.1007/BF00299929

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