The Development of Vernal Migratory Behavior in Caged Individuals of Several Taxa of Zonotrichia.

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[edit] Author(s)

  • Farner, D. S.
  • King, J. R.
  • Wilson, A. C.

[edit] Journal

Anatomical Record 128.3 (1957): 546.

[edit] Meeting Abstract

During late winter and spring in 1946 and 1957 continuous records of activity were obtained for individual birds of four migratory taxa (Zonotrichia Zeucophrys gambelii, Z. 1. pugetensis, Z. atricapilla, and Z. qserula), and for the nonmigratory Z. 1. nuttalli. The recording was affected with individual outdoor automatic recording cages. Records were obtained for 39 individual birds. In each case among the migratory forms, migratory behavior (Zugunruhe) began approximately at the time of beginning of the natural migratory period. Although all cages were placed close together in the same outdoor enclosure, the members of each taxon appeared not to be influenced by the activity of other taxa in adjacent or nearby cages. Although the non-migratory Z. 1. nutalli displayed some noctural activity (a maximum of 13 per cent of the total diurnal activity), it was relatively small compared with that of the migratory forms with maxima of 51-69 per cent of the total diurnal activity. In the migratory forms Zugunluhe developed only with a marked increase in body weight. Detailed studies of Z. 1. gambelii showed that the weight increment is principally fat and that the energy thus stored is the result of a positive balance engendered by a light-induced hyperphagia. It appears that such a light induced modification of energy balance is absent in Z. 1. nuttalli.


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