DE BEDREIGING VAN WILDE STAMVORMEN DOOR VAN HEN AFGELEIDE HUISDIEREN

Samenvatting

The article discusses the genetic composi­tion and the origin of flocks of feral geese in the Drentse A/Hoornse Diep valley. The population both includes groups of birds which strongly resemble Greylag and heter­ogeneous troaps of domesticates of many origins. Such troops include the fertile descendants of hybrids from domesticated geese, Chinese/African geese, Canada geese and Whitefronts. These birds are a potential threat to wild populations of Greylag. However, crossing is limited by the very small radius of action of the members of the feral flocks.