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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Eurasian Golden Plovers Pluvialis apricaria and Northern Lapwings Vanellus vanellus in the Netherlands: trends in numbers and distribution since the 1970s
Auteurs :	Romke Kleefstra, Auteur ; Marc van Roomen, Auteur ; Erik van Winden, Auteur ; Dirk Tanger, Auteur
Type de document :	Article
Dans :	Limosa (87(1) 2014)
Article en page(s) :	20-32
Résumé :	Countrywide counts of Golden Plovers in the Netherlands in autumn show a decrease since the mid-seventies from a total of 400,000 in 1976 and 1978 to 214,000 in 2008. The trend based on the national waterbird monitoring program shows the opposite; numbers in monitoring sites, mainly wetlands, increased since the mid-1980s (Fig. 1). The trend in these sites for the Lapwing is similar, while nationwide counts since the mid-1990s indicate a decrease (Fig. 2).The discrepancy between the nationwide surveys and the monitoring program can be explained by the fact that a large decrease took place in the agricultural landscape, which is not well covered by the waterbird monitoring program. Both species shifted their distribution more towards wetlands, including areas with freshwater lakes and mud-flats in the Delta area and the Wadden Sea, at the expense of numbers in farmland (Figs. 7 and 8). A number of changes and probably the combination of these in the agricultural landscape could have caused this, including the drainage of farmland, lower earthworm abundances, fast growing and higher grass vegetation in autumn and decreased openness of inland staging sites.On the international scale a redistribution of Golden Plovers over the flyway seems to have taken place as well. Since the early eighties, less hunting pressure has lead to a longer stay in Denmark in autumn, resulting in lower numbers in The Netherlands. Lapwings seem to increase in Denmark as well, for the same reason. Furthermore, since the millennium there seems to be an ongoing shift in the autumn distribution of Golden Plovers towards Sweden and Poland (Tab. 2), probably coherent with milder climatic conditions, that allow the birds to stay closer to their breeding areas for a longer period.

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