La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Long-term trend of the Middle Spotted Woodpecker Picoides medius in Favoritepark Ludwigsburg, SW Germany.
Auteurs :	Christoph Randler, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (42(1) Januar 2003)
Article en page(s) :	41-50
Résumé :	The german population comprises 20% of the Middle Spotted Woodpecker's world population. Therefore monitoring and conservation is urgently needed. Here, I present the development of a small population in an isolated area, the Favoritepark in Ludwigsburg, SW-Germany. A remarkable decline took place between 1950 (simeq 10 pairs) and 1987/88, when the population was "extinct". The habitat seems suitable for the Middle Spotted Woodpecker because it consists of deciduous wood and about 50% of its area is covered with oak trees. To check the present status I surveyed the population in 2001 and 2002 and found 4-5 territories and 5-6 respectively, which is not unusual for a habitat of that size. Some remarks about the usefulness of small-scale sample plots are made because modern theories about metapopulations deal with "regular" extinction and re-colonisation of small and fragmented habitats. Further, when considering declines in populations, the duration of the study has to be taken into account to assess longterm changes.

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