Aves, p�le ornithologique de Natagora

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Aves, 17/1-2 | 1980 | 1-16

  Winter-census of the Buzzard (Buteo buteo) in the Entre-Sambre-et-Meuse area.
Guerriat, H.

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This census was carried out during the winter 1977-1978, along an itinerary prospected by car at slow speed. The evolution of the number of birds from the beginning October to the end of March shows a period of relative stabilization from the third decade of November to the first decade of March, corresponding to the so-called wintering-period. Moreover the simple notation of the pattern according to four types allows to determine the percentage of very clear and very dark Buzzards as well as their winter variations. Finally, a very clear aggregative geographical distribution is shown during this period. The weather conditions during this census probably play a role in defining the number and distribution of the Buzzards present in the area and effectively counted. The importance of this role can only be determined by successive censuses spread over several years.

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