Summary
In handraised experimental groups of 4 populations ofSylvia atricapilla, it was found that the development of migratory restlessness under constant conditions was a fairly good reflection of the different (typical, partial, and non-) migratory habits of the populations. Thus, the different migratory habits seem to be endogenously preprogrammed and genetic in origin. The results of a preliminary cross-breeding experiment are at least compatible with the assumption that partial migratory habit in the blackcap is due to polymorphism.
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Literatur
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Supported by the Deutsche Forschungsgemeinschaft; 25th paper of the warbler program of the institute.
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Berthold, P. Endogenous control as a possible basis for varying migratory habits in different bird populations. Experientia 34, 1451 (1978). https://doi.org/10.1007/BF01932346
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DOI: https://doi.org/10.1007/BF01932346