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Die Avizonose einer oberrheinischen Agrarlandschaft


, : Die Avizonose einer oberrheinischen Agrarlandschaft. Anzeiger der Ornithologischen Gesellschaft in Bayern, 213: 137-151

Between 1974-1981, the avicenosis of a 630 ha landscape north of Mannheim was studied during 426 excursions. The area consists of 80% agricultural land and 20% suburbanized land. Bird species (109) were identified including rollers, dotterels, lesser gray shrikes and Bonelli's warblers. The majority of the species were seen in Sept. and Oct. The number of songbird species in all months was .apprx. 70%. The number of nonbreeding species fluctuated between 9% in June and 49% in Oct. Breeding bird species (49) were recorded, including 45 that were seen regularly. The species most frequently observed was the skylark, which occupied 200 territories. Other dominant species with over 25 territories are pheasants, barn swallows, whitethroats, blackbirds, yellow hammers and house sparrows. Two studies on population density on differently structured field areas 50 ha in size yielded 5.2 territories/10 ha, 6 spp. and 0.98 kg biomass in the uniform sample areas and 9.8 territories/10 ha, 20 spp. and 1.87 kg biomass on the multistructured sample areas. The most frequent species on the red list (endangered species) are yellow wagtails and corn buntings.

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