Facteurs climatiques et reproduction du Pinson des arbres (Fringilla coelebs L.) sur le plateau des Hautes-Fagnes ; Climatic factors and reproduction of Chaffinch (Fringilla coelebs L.) on the Hautes-Fagnes plateau (Belgium)

The influence of climatic and behavioural factors on the progress and success of the breeding cycle of chaffinches (Fringilla coelebs) has been investigated on the Hautes-Fagnes plateau (Belgium). From april to july 1980, three line transects (two of 1,6 and one of 1,2 km) in Norway spruce plantations were regularly prospected. The estimation of the number of territorial males was improved by a sonographic analysis of their songs, The breeding season has been marked twice by unfavourable weather conditions. In april, a cold-wave produced flocks reformation, but after then the cycle could evolv... Mehr ...