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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Changes in the breeding-bird community of a cultivated mire in western Schleswig-Holstein, 1950 to 1997
Auteurs :	Guenther Busche, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (121(1) 2000)
Article en page(s) :	27-37
Résumé :	The history of cultivation of the "Ostroher/Suderholmer Moor" is described and illustrated (Fig. 1 and 2). Part of the mire (283 ha) was declared a landscape protection area in 1972. The area, which is strongly divided by roads and tracks (Fig. 3), comprises grassland (45% of the total area), reed beds, birch and alder carr (in total 32%) as well as open water (21%, 34 ponds, mostly used for fishing). The breeding bird population of the mire was surveyed on study plots in 1985, 1990 and 1997 using a standardised territory mapping method. Within the last 50 years, the breeding bird community of the mire has changed drastically. Twenty-five species nesting in scrub/woodland, four ground-nesting species and four waterbird species increased in numbers, some significantly. Six ground-nesting, two waterbird species and one scrub-nesting species decreased in numbers (see Appendix). The population changes of many species are a result of the spread of bushes and trees. However, large areas of open grassland (126 ha within the landscape protection area) hold only few pairs of wet grassland species (Tab. 4). Low densities of 16 pairs per 100 ha have been recorded in this habitat. Part of the changes in the bird community of the mire reflect national trends (see Appendix). The breeding bird community of the mire is of regional and state importance because of the occurrence of a Black Tern colony in a man-made habitat (Tab. 5 and 6). Without the Black Terns the mire is only important for birds at the county level. Protection as a landscape protection area allows for a better management of the mire. The protection of the area as a nature reserve is not justifiable for reasons of motivation of private landowners with regard to management measures, and according to the current assessment of the habitats.

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