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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	[Dramatic decline of the Grey Partridge Perdix perdix in Central Zeeuws-Vlaanderen]
Auteurs :	Henk Castelijns, Auteur
Type de document :	Article
Dans :	Limosa (74(1) 2001)
Article en page(s) :	32-35
Résumé :	Grey Partridges are highly resident and inhabit farmland. The southwestern region of the Netherlands, especially Zeeuws-Vlaanderen, is known as a stronghold for Grey Partridge. Grey Partridges are easily counted in open farmland when snow-covered (c. 350 ha per hour). In a study area in Central Zeeuws-Vlaanderen (82.4 km2, 80% arable fields, 5% grassland) complete census counts were carried out during the winters of 1990/91, 1993/94 and 2000/01. In February 1991, 696 Grey Partridges were counted (70% of the study area covered), in February 1994 461 individuals (98% covered) and 122 Grey Partridges in December 2000 (72% covered). Numbers in the study area were estimated at 875, 461 and 140 individuals respectively (Tab. 1, Fig. 2). Numbers fell by 84% in a period of ten years, densities have dropped from about 10.6 to 1.7 ex./km2. Presumed that two birds together formed a pair, on 11-12 February 1991, 16% of the individuals was associated in pairs, 68% was associated in pairs on 21-23 February 1994. No pair band was determined in December 2000. Before 1990, no snow-cover surveys were carried out. In the adjacent West Zeeuws-Vlaanderen snow-cover survey numbers have fallen with more than 75% in 1970-85. This resembles the drastic decline in breeding bird numbers of a sampling area of 15-20% in Central Zeeuws-Vlaanderen: 80% in 1960-85. It is concluded that the decline of the Grey Partridge in the stronghold (Central) Zeeuws-Vlaanderen amounted to 95% in the period 1960-2000.

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