Seasonal changes in song nuclei and song behavior in Gambel's white‐crowned sparrows
Tóm tắt
In 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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Tài liệu tham khảo
Bernard D., 1993, Two independent markers demonstrate an increased volume of HVC in short‐day photosensitive relative to long‐day photorefractory European starlings, Soc. Neurosci. Abstr., 19, 1017
Blanchard B. D., 1949, The cycle in the Gambel sparrow, Univ. Calif. Publ. Zool., 47, 255
Canady R. A., 1988, Effect of testosterone on input received by an identified neuron type of the canary song system: a Golgi/electron microscopy/degeneration study, J. Neurosci., 8, 3770, 10.1523/JNEUROSCI.08-10-03770.1988
Nottebohm F., 1987, Higher Functions of the Nervous System
Rucker M. G., 1991, Song control nuclei of the house sparrow (Passer domesticus) are photoperiodic and photorefractory, Soc. Neurosci. Abstr., 17, 1051
Smith G. T., 1992, Testosterone changes song control region volume in photostimulated Gambel's white‐crowned sparrows (Zonotrichia leucophrys gambelii, Proc. Int. Cong. Neuroethol., 3, 292
Smith G. T., 1994, Seasonal changes in the avian song nucleus HVC as defined by multiple labels, Soc. Neurosci. Abstr., 20, 163
Wingfield J. C., 1987, Psychobiology of Reproductive Behavior: An Evolutionary Perspective