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Eine dreijährige Feldstudie zum sichtbaren Frühjahrszug am Bodensee (Süddeutschland)
Journal
Vogelwarte
Volume
43
Number
3
Pages / Article-Number
171-178
Abstract
We presently develop a data bank on visible diurnal spring migration. Data were collected in three spring periods (1984 - 1986) at an exposed observation point at the bank of Lake Constance (Bodensee, southern Germany). 831 observation hours were done in 194 days from beginning of March to beginning of May, each day from sunrise to late morning/midday. The project yielded 35,583 records of migrants, with a total number of 138,543 individuals in 96 species. The results from Lake Constance are briefly compared to a Dutch study (LWVT/SOVON 2002), particularly focusing on spring migration of forest birds. Moreover, the following points are addressed: median signals and phenology (with special emphasis on fourteen 'caler dar' bird species and black kite Milvus migrans), migration behaviour of typical resident birds (for eurasian collared dove Streptopelia decaocto, carrion crow Corvus corone corone and house sparrow Passer domesticus), main migration heading (for penduline tit Remiz pendulinus, meadow pipit Anthus pratensis and wood lark Lullula arborea), and treecreepers Certhia bracaydactyla as rare migrants. With a second, long-term investigation at Lake Constance putative changes in migration behaviour during the last decades could be detected. In the next step, we provide the final version of the database as open source, for free download from the Internet. This will allow other researchers an extension of comparative analyses, e.g. for a detailed evaluation of migration pattern and predominate weather conditions.
