chipeau Meuse

The Gadwall favours shallow, nutrient-rich standing waters with well-developed submerged vegetation and extensive reed and marsh fringes. Typical habitats are shallow lakes, ponds, oxbows, sheltered bays of larger inland lakes and coastal brackish waters. Dense reedbeds provide cover and breeding sites, while open water with abundant aquatic plants supplies food: the species feeds mainly by dabbling on submerged plants and seeds, with invertebrates playing a secondary role.

The Gadwall only became established as a regular breeding bird in Central Europe during the nineteenth century. From the 1970s onwards a marked and continuing increase in the breeding population has been documented. In Germany the breeding population now numbers several thousand pairs, concentrated in the northern lowlands and along the North Sea and Baltic coasts, with only patchy occurrence elsewhere. In Switzerland the species is a rare but regular breeder with a small number of pairs, while in winter it is a comparatively common waterbird on the larger lakes.

For reliable field identification, the white speculum is the key feature in both sexes. In the drake it sits against the contrast of grey vermiculated flanks, black tail coverts and a uniformly dark grey bill. The female resembles a female Mallard at a glance but can be told apart by the whitish belly in flight, the same white wing patch and a dark bill cleanly edged with orange along the sides, very different from the diffuse pattern of a Mallard hen. Outside the breeding season Gadwalls are usually seen in small flocks, often mixed with other dabbling ducks.

In a hunting context the Gadwall is classified as game in Germany but is not subject to an open season in every federal state. Where hunting is permitted, closed and open seasons differ between Länder, and several states protect the species year-round. Observations from heavily hunted waters show that Gadwalls avoid them as staging and feeding sites, while areas with hunting restrictions consistently hold higher numbers of resting birds. For management this means preserving structurally rich shallow waters with extensive reed and marsh zones, and taking particular care to identify birds before the shot, since female Gadwalls are easily confused with female Mallards and other dabbling ducks.