Seasonal changes in song nuclei and song behavior in Gambel's white‐crowned sparrows

Wiley - Tập 28 Số 1 - Trang 114-125 - 1995
G. Troy Smith1, Eliot A. Brenowitz2,1, J. C. Wingfield1, Luís F. Baptista3
1Department of Zoology, NJ-15, University of Washington, Seattle, Washington, 98195
2Department of Psychology NI-25, University of Washington, Seattle, Washington, 98195
3Department of Ornithology and Mammalogy, California Academy of Sciences, Golden Gate Park, San Francisco, California 94118

Tóm tắt

AbstractIn males of several songbird species, the morphology of forebrain nuclei that control song changes seasonally. The only seasonally breeding songbird in which seasonal changes in the structure of song control nuclei have been reported not to occur is the nonmigratory Nuttall's subspecies of white‐crowned sparrow. In the present study, we manipulated photoperiod and plasma testosterone concentrations in captive male white‐crowned sparrows of the migratory Gambel's subspeices. Males exposed to photoperiods and plasma testosterone concentrations typical of those experienced by wild breeding males had larger song control nuclei than males held on a winter photoperiod. We also found seasonal change in stereotypy of spectral and temporal parameters of song in wild Gambel's white‐crowned sparrows. We hypothesize that seasonal changes in song control nuclei may correlate with seasonal changes in song stereotypy. © 1995 John Wiley & Sons, Inc.

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Wiley

Tập 28 Số 1

114-125

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