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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Effects of large-scale restoration processes on the bird community of a river floodplain
Auteurs :	Josef Kreuziger, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (119(2) 1998)
Article en page(s) :	65-90
Résumé :	In the nature protection area "Kuehkopf-Knoblochsaue" (2,369 ha) on the river Rhine in Hesse, central Germany, natural inundation dynamics were re-established on 1400 ha since 1983. 330 ha of cultivated fields were reconverted to meadows and commercial forestry was abandoned. The response of the breeding bird community to these changes was studied from 1994 to 1996 by means of a grid-square survey (108 squares of 25 ha each). The results were compared with those of a study in 1979 that used identical methods. A total of 89 breeding bird species was found in 1994-96, four more than 1979. Over a third of the species increased in abundance, less than 10% decreased. On average, the number of species increased from 24.8 to 30.0 per 25 ha square. This small-scaled increase in species richness was mostly due to structural changes of the vegetation during the restoration process. In wooded habitats this resulted in improved food availability, on the former agricultural fields opportunities for nest placement increased considerably (through growth of bushes). Over the 16 year period most species showed considerable changes in dispersion within the study area. In contrast, most species breeding in reed beds and along the water's edge decreased. This may have resulted from reduced food-availability caused by pesticide use against mosquitos (BTI) and acceleration of water flow in the river Rhine. Long-distance migrants showed more negative trends than residents or partial migrants. Independently of the migration strategy, conditions on the breeding grounds seem to be of greatest importance for long-term population trends.

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