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Müller, C. & M. Ernst

Verbreitung und Dichte der Feldlerche Alauda arvensis und fünf weiterer Brutvögel des Kulturlandes im Kanton Aargau 2011.

2014

111

13–34

Key words
(von 1994 bis 2006 vergeben)

Verbreitung, Dichte, Reviere, Lebensraum, Bestandsentwicklung, Kulturland, Aufwertung, Lebensraumverbesserungen

Schlagwort_Vogelart
(wissenschaftlich)

Alauda arvensis, Emberiza citrinella, Lanius collurio, Milvus milvus, Falco tinnunculus, Coturnix coturnix

Schlagwort_Vogelart
(deutsch)

Feldlerche, Goldammer, Neuntöter, Rotmilan, Turmfalke, Wachtel

Aargau, Schweiz

deutsch

Abhandlung

Distribution and density of Eurasian Skylark Alauda arvensis and five other farmland bird species in the canton of Aargau 2011. – In 2011, the breeding distribution and density of Eurasian Skylark Alauda arvensis, Common Quail Coturnix coturnix, Red Kite Milvus milvus, Eurasian Kestrel Falco tinnunculus, Red-backed Shrike Lanius collurio and Yellowhammer Emberiza citrinella were investigated in the canton Aargau, a lowland region with hills in Northern Switzerland. Within a grid square (n = 216) of 2 × 2 km, the square kilometre with the highest Skylark occupancy potential was selected and three 1-hour surveys were conducted in order to map the breeding territories of the six species. 156 grid squares without potential breeding habitat for the Skylark (dominated by forest or settlements) were excluded. Skylarks were found in 38 % of the examined grid squares and were most abundant in the Jura Mountains in the northern part and in some open areas in the South of the canton. Occupancy and densities of crop areas and ecological compensation measures were also higher than the average. Mean densities in occupied squares were 2.5 territories/km2 (range between 1 and 14). Compared to surveys in the 1990s, the distribution range decreased by 30 % and the mean density by about 50 %. Red Kite, Eurasian Kestrel and Yellowhammer are widespread in the canton of Aargau, while Common Quail and Red-backed Shrike are rare breeding birds. We conclude that the ecological quality of the remaining breeding areas of Skylarks should be enhanced by extensifying the agricultural production. This includes suitable ecological compensation measures as well as low-input options. Other species with similar requirements would also benefit from habitat improvements.