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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The breeding bird species of the Rhine riverine forests in Alsace (Northeastern France): richness, densities and relationships to habitat. (2016)
Auteurs :	Pascal Denis, Auteur
Type de document :	Article
Dans :	Alauda (84(4) 2016)
Article en page(s) :	267-280
Résumé :	The breeding birds of the riverine forests along the Rhine in France have been studied by 162 point counts where habitat characteristics have been taken into account (tree species, topography). Three areas have been studied by mapping method in order to calculate absolute densities. The Rhine riverine forest is a mixture of oaks and ashes interspersed with other broad-leave tree species. The canopy is often open and comprises a great proportion of old trees. The statistical analysis shows that the first factor of variability is the volume of vegetation, the second one the height of trees, the third one the occurrence of lower vegetation layer. The forest size also plays a role on the abundance of some species. When considering the tree species, the lime tree (dry parts) and the poplar (cultivated or not, wet areas) introduce local heterogeneity among oaks, ashes and maples. Nearly ninety breeding species were noted, foremost warblers and Common Chaffinch. The predominance of warblers over the Common Chaffinch is one of the originality of the Rhine riverine forests. In other forests in Europe, it is the Common Chaffinch which dominates. With some 75 breeding pairs/10 ha, the avifauna is richer than the mean found in European forests. On some 10% of its size, up to 90 pairs/10 ha can occur: those values were only recorded in other (very rare) riverine forests in Europe. The first differentiation factor is the occurrence of wet areas, old water courses and reedbeds. The presence of breeding waterbirds inside of these forests is one of the major characteristics of the riverine forests. Outside of the wet habitats, the bird groups are differentiated according to arboreal vegetation volume as a result of the coverage of the latter and the overall surface area (these two factors being positively correlated).

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