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

Ajouter au panier

Ajouter au panier

Lien vers la notice

Titre :	Seasonal distribution pattern dynamics of a bird community in a Mid-Swabian forest landscape
Auteurs :	Hans Utschick, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (43(1) May 2004)
Article en page(s) :	19-47
Résumé :	Combined grid (90 units of 6.25 ha) and polygon mapping (92 forest stands from 0.3 to 29.7 ha) of a bird community on 562 ha of a Mid-Swabian forest landscape (2 test areas of 250 ha each near Ettenbeuren/Krumbach and Oberschonegg/Ottobeuren; 1 area of 62.5 ha near Edelstetten, Southern Bavaria) was used to analyse the influence of stand composition and management intensity on the time-space-distribution of forest birds (time-standardized monthly counts; Mar 1999 to Feb 2000). Main results are: - Bird communities of forest stands depend on stand characteristics and on the local character of the surrounding forest landscape as well. During the breeding period, stand characteristics (in small stands those of the neighbouring stands too) are more important. During summer (fledgling period) and autumn (migration) landscape variables like stand distribution patterns, and mainly in winter, the local space-pattern of climatic site-conditions strongly influence local distribution of forest birds. - Habitat preferences of forest birds fluctuate within a year between nearly all stand classes (tree composition, age, structure, intensity of use) of the tested, very productive and heavily used forest area. Same was found at the tree species level, where the distribution pattern of large-dimensioned oaks, leaf trees (without beech) or larches is very important. - In a managed spruce-dominated landscape mature nature reserves and similar broadleaved stands of sufficient size are necessary for a high bird species diversity due to founder population effects. At all seasons, such stands specially increase the value of local bird communities when situated on slopes with southern exposition at margins of extensive forest areas. The consequences for using forest bird data in nature conservancy problems (for example in creating management strategies following an evaluation impact study or in planning the conservation and development of reserves) should lay emphasis on non-breeding aspects (at least winter aspects) and on forest characteristics at the landscape level (connectivity aspects at least at the km2-level). The most suitable method is a quantitative grid mapping with subunits (stand polygons within the grid), but this method has rarely been used to date due to difficulties getting comparable data standards at different landscape levels. What is important for the forestry management in the Mid-Swabian, spruce-dominated forest landscapes, is that the time-space patterns, specially those of coniferous bird guilds, are well supported by the existing management system (Altersklassenwald) based on rotating qualities (time, space) of small sized forest stands (average 6 ha). But high bird community diversity can only be reached, if this system is be completed by a narrow grid of mature broadleaved stands or reserves (4-10 ha), especially on sunny slopes (very important mainly for winter birds) and at forest margins, and an enrichment of leave trees and larch within many spruce stands.

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+