Summary
InSylvia borin andS. atricapilla, circannual rhythmicity was found in moult, migratory restlessness and in changes of body weight and gonad size under constant photoperiodic conditions.
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2. Mitteilung aus dem Grasmückenprogramm des Instituts.
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Berthold, P., Gwinner, E. & Klein, H. Circannuale Periodik bei Grasmücken (Sylvia). Experientia 27, 399 (1971). https://doi.org/10.1007/BF02137272
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DOI: https://doi.org/10.1007/BF02137272