La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Influence of land use system and landscape topography on the breeding density and distribution of Skylarks (Alauda arvensis) in South Bavarian hill country.
Auteurs :	Johannes Schreiber, Auteur ; Hans Utschick, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (50(2-3) DEC 2011)
Article en page(s) :	114-132
Résumé :	In a hill landscape 45 km north of Munich skylarks were counted by quantitative grid mapping (250 m x 250 m units). Area A with 1100 ha was surveyed in 2004, area B with 662,5 ha in 2009 and C with 665,25 ha in 2010. In each case three survey visits were made, in late March, April and late May. Based on a fine grained landuse classification, on landscape topography and on rough grained connectivity patterns a model for skylark distribution was developed using data from area A, calibrated by data from B and evaluated with data from C. The most important factors for skylarks are sown grasslands, arable fields (mainly grain) and rape crops, especially in the proximity of set-aside fields, boundary ridges, gravel tracks and small meadows. Also very important are open, smoothed landscape structures towards the top of broad ridges or hills. Only few skylarks were found on steep lanes or in narrow valleys.Where land use data and topography models are available for 250 x 250 m landscape units, the distribution of skylark habitats may be predicted for South Bavarian hill country and the results employed in nature conservancy management plans.

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