The study had been conducted in a region of Gibraltar /map/ in 2009-2012. Antonio-Román Muñoz presented some results at the Conference on Wind Power and Environmental Impacts Stockholm 5-7 Feb 2013. Also you can get general ideas about the main research directions of the group of Spanish biologists:
• Beatriz YÁÑEZ, Antonio-Román MUÑOZ, Beatriz MARTIN, Manuela DE LUCAS, Bert TOXOPEUS & Miguel FERRER, 2013 – Effects of wind farms on local and migratory populations of Short-toed Eagle Circaetus gallicus – 
(En) – presentation, 31 pages.
The presentation is available on a website of The Swedish Environmental Protection Agency, as well as abstracts of the conference – (En).