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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Ornithological interest and recent developments at the Hollogne-sur-Geer sedimentation ponds
Auteurs :	Alain Jortay, Auteur
Type de document :	Article
Dans :	Aves (48(3) SEP 2011)
Article en page(s) :	153-170
Résumé :	215 species of birds have been observed at the sedimentation ponds of the Hollogne-sur-Geer sugar factory. The ponds offer a nesting place for several species on the Red List of threatened birds in Wallonia, notably the Black-necked Grebe Podiceps nigricollis (38 pairs), the Gadwall Anas strepera (10 pairs) and the Northern Shoveler Anas clypeata (1 pair), as well as other species of patrimonial interest such as the Bluethroat Luscinia svecica (2-4 pairs), and the Sedge Warbler Acrocephalus schoenobaenus (1-3 pairs).Over the last 16 years there have been various changes at the site, both quantitative (area extended from 25 ha to 41 ha) and qualitative (cessation of activity at the factory, development of the vegetation). These changes were favourable to the ducks, either over-wintering or migratory, nesting on the site (6 species). Numbers of post-breeding waders decline, but pre-breeding numbers increase. The development of the vegetation and the fact that some ponds are no longer dried out reduce the numbers of post-breeding visitors whereas the enlargement of the site and of the spring-time bare areas are still favourable to the pre-breeding season visits. Management measures should include the annual drying out, in summer, of some of the ponds, and the overall protection and development of the reed beds.

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