Bibliothèque Tour du Valat

Se connecter

Mot de passe oublié ?
Pas encore inscrit ?

La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Détail

Notice ajoutée !

Notice ajoutée !

Lien vers la notice

Titre :	Population development, habitat use and interaction of Magpie Pica pica and Hooded Crow Corvus corone cornix in Berlin.
Auteurs :	Roland Lehmann, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (123(4) 2002)
Article en page(s) :	213-221
Résumé :	From 1969 to 1998 the abundance of the Magpie in the district Prenzlauer Berg (10.95 km2) increased from 0.8 p/km2 to 13.3 p/km2. During the same period, the abundance of the Hooded Crow increased from 0.3 p/km2 to 4.6 p/km2. From 1995 to 1998 the habitat selection and interaction of these two species was studied in detail. The population growth rate of Hooded Crow (13.6 to 37.5%) was higher than that of Magpie (15.5 to 13.9%). Both species preferred parks, cemeteries, sport yards, other unbuilt areas, in particular inner courtyards of large housing blocks, where 34.9-43.6% of Magpies and 38.5-59.1% of Hooded Crows bred. Magpies showed a higher preference for streets, detached houses and allotment gardens than Crows. Preferred Magpie nest sites (n=577 nests) were Populus spec. (17.5%), Acer spec. (13.7%), Populus spec. var. pyramidalis (12.0%), Tilia spec. (11.8%) and Platanus hybrida (10.4%), while Hooded Crows preferred Tilia spec. (21.2%), Aesculus spec. (21.2%), Populus spec. (16.4%) and conifers (10.3%). Magpies used 18 types of nest substrate, Hooded Crows used 13. Both species pereferred the same altitude range for nesting (17-20 m from ground). Below 17 m, 22.2% of Hooded Crow nests and 40% of Magpie nests were located. The simililarities in habitat use, especially nest site selection, together with the population growth of Hooded Crow leads to increased competition between the two species. During 1995-1998, 18.8-42.3% of Hooded Crow nests were in areas which held breeding Magpies the year before and replaced the latter species. The overall rate of Magpie territories vacated due to take-over by Hooded Crows is 4.0-13.4% of the total Magpie population. Magpies lost a similar proportion of sites due to other factors (tree cutting, building activities, unknown reasons). If the Hooded Crow population continues to grow, a further replacement of Magpies is to be expected.

FAQ

Infos pratiques

Heures d'ouverture et contact

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

Liens utiles

A-
A
A+