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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Thirty years of monitoring of meadow birds in Tryggevaelde Valley, Zealand, Denmark.
Auteurs :	Lars Dinesen, Auteur ; Tom Romdal, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (96(4) 2002)
Article en page(s) :	179-186
Langues:	Anglais
Résumé :	Tryggevaelde Valley (Fig. 1) has been known as an important breeding and stopover site for many species of meadow-bird. Before 1970 the valley was used intensively for cattle grazing. Later, as grazing ceased and vegetation changed, species like Dunlin Calidris alpina and Ruff Philomrachus pugnax have disappeared from the locality. Meanwhile. other meadow birds like Lapwing Vanellus vanellus, Redshank Tringa totanus, Common Snipe Gallinago gallinago, Yellow Wagtail Motacilla flava and Sedge Warbler Acrocephalus schoenobaenus, which have been in general decline in Denmark, have remained common. They are all on the Danish list of endangered or vulnerable species. This paper presents the results of systematic monitoring of meadow birds from 1990-2000, compared with observations from before and after 1970. Reestablishment of grazing after 1990 resulted in a surge in the breeding populations of Lapwing, Redshank and Common Snipe, but by 2000 these populations have returned to a lower level. Extrapolating this development, Redshank (5 breeding pairs) can be expected to be lost as a breeding species within the next decade. The main problem for breeding waders in Tryggevaelde Valley seems to be increased vegetation cover from bushes and trees, which favour predators, combined with a decline in grazing intensity and, possibly, lower water levels. Many birds recorded during the counts do not actually complete their breeding cycle, but leave Tryggevaelde Valley early in the season. Yellow Wagtail and Sedge Warbler have stable populations and, unlike the waders, are not immediately affected by succession. The Sedge Warbler population is the largest on Zealand. Corncrake Crex crex has been recorded in each of the last seven years. With more than 120 private landowners, a consensus about management of Tryggevaelde Valley is difficult to obtain but is, nevertheless, a necessity if the area is to remain an asset in the effort to maintain populations of vulnerable and declining meadow birds in Denmark.

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