| Titre : | Avifaunal changes in response to changes of land-use and structure of farmland: A case study from southern Germany |
| Auteurs : | Helmut Laussmann, Auteur ; Harald Plachter, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (119(1) 1998) |
| Article en page(s) : | 7-19 |
| Résumé : | A study farm of about 150 hectares north-west of Munich (Bavaria) was managed by an interdisciplinary research project starting in 1991. After two years of conventional farming, the area was split into two parts. Since then, one half of the area was farmed according to the concept of integrated production, the other one according to the guidelines of ecological farming. The rearrangements included the establishment of specific habitat structures such as deadwood hedges, field margins, unused borders along banks and set-asides. We investigated the bird fauna before and after the rearrangements on about 125 ha of the farm area over a five year period (1991 to 1995). Only two breeding bird species disappeared after the arrangement, whereas ten new species colonized the area, among them in the very first year Red-backed Shrike Lanius collurio, Partridge Perdix perdix and Quail Coturnix coturnix. The total number of breeding pairs increased steadily from 212 in 1991 to 339 in 1995. The density of foraging birds of prey increased considerably. Kestrels Falco tinnunculus were seen four time more frequently after the rearrangement and profited from additional fallow land. The results demonstrate that bird communities are a good indicator of that state of a given landscape section. Birds are appropriate indicators for changes of farmland structure and land-use techniques. This becomes particularly clear, when the species are arranged into habitat-specific guilds. Our results also show that - even if the potential for colonization is high - the adjustment to the new situation takes several years. |
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