La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	[Breeding distribution, population estimate and density of the Middle Spotted Woodpecker Dendrocopos medius at Stromberg (Nordwuerttemberg)]
Auteurs :	Christoph Randler, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (39(2-3) September, 2000)
Article en page(s) :	197-206
Résumé :	In 1999 Middle Spotted Woodpeckers have been censused at the 'Stromberg', about 40 km north of Stuttgart. The study area covers 122 square kilometres and comprises 7920 ha of woodland, with a high percentage of oak trees. 19 random sample plots sized between 35 ha and 250 ha have been surveyed in March. Play-back-calls were used to provoke responses. 128 territories have been found within 1900 ha; the total number of territories is therefore estimated to be 533. Some factors are used to correct the number of 533 territories, so that the population can be estimated to range from 410 to 586 territories. Densities reached from 0,18 terr./10 ha to 1,3 terr./10 ha (0,6 terr./10 ha on average). Most individuals approached the tape and responded with their typical 'rattle call'. Around the mid of April the reactions of the Middle Spotted Woodpeckers towards the play-back-calls were remarkably weaker and less 'aggressive', perhaps because of the beginning of the laying period. Some aspects and problems of censusing Middle Spotted Woodpeckers are discussed and different methods of other authors compared.

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...