This report comments on the results of one month study and studies performed earlier with the scope on the impact of a proposed wind farm on migrating birds. In addition, the available data were used to set up a priority list for the species involved. The reports on the field studies 2003 – 2007 are not sufficient, mainly with respect to the spatial and temporal aspects of migration. There is a mismatch in the overall numbers of species passing through the territory offered by the scientist from Bulgarian Academy of Sciences (Nikolay Karaivanov) and BSPB (Bulgarian BirdLife partner). Taking all preliminary available information into account, a standardized systematic monitoring has been planned and performed in autumn 2008.
Simultaneous observations in 8 locations through the planned AES Geo Power wind park provided full coverage of the territory. The data collected allowed special and temporal analyses of the soaring bird migration as well as the usage of the territory by the feeding migrants and local birds. The simultaneous observations through the territory allow to test different mitigation schemes in order to reduce the collision risk for the birds during the exploitation period of the wind park.