| Titre : | Habitat selection by territorial male corn buntings Miliaria calandra in a Danish farmland area |
| Auteurs : | Ole Lilleor, Auteur |
| Type de document : | Article |
| Dans : | Dansk Ornitologisk Forenings Tidsskrift (101(3) 2007) |
| Article en page(s) : | 79-93 |
| Langues: | Anglais |
| Résumé : | Male Corn Buntings Miliaria calandra were mapped in a 28 km(2) farmland area in Djursland, Denmark. Mean territory density was 8.8 territories km(-2) but with great local variation, up to a maximum of 23.9 territories km(-2). The distribution of birds and habitat characteristics (crops, hedgerows, soil types etc.) were analysed by using Principal Component Analysis (PCA) and linear multiple regression.The highest Corn Bunting densities were found on the most fertile soil type, while the birds strongly avoided bog, forest and humus soil areas. There was a clear preference for areas with the greatest proportion of tillage, but with a strong preference for tilled land with many fields and high crop diversity. Corn Bunting density correlated significantly with several crop types, but sometimes this was merely due to a preference for tilled land per se. After controlling for extent of tilled land, only winter rape, beets and mixed spring barley/peas showed significant positive partial correlation coefficients with Corn Bunting density while rye was avoided. In the tilled land density was highest were small grassy habitats made up 1-5% of all habitats.The decline in the Corn Bunting population in Denmark during several decades and the partial recent recovery is discussed. Changes in farming systems from traditional mixed farming to more specialized and intensive farming seems to have been an important factor in the decline. |
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