Studies by Perrins (1965; 1970) have suggested that in several bird species there is a strong selection pressure favouring early breeding, that is as early as the feeding conditions for the female in the period of egg formation permit. This conclusion is confirmed by the recent finding that the provision of additional food in the pre-laying period can advance egg laying in the Great tit Parus major (Källander, 1974).
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- The occurrence of time-saving mechanisms in the breeding biology of the Great tit, Parus major
Dr H. N. Kluyver
Dr J. H. van Balen
Dr A. J. Cavé
- Macmillan Education UK