Hmmm, no other factors at play? Like urban growth, pesticides, loss of nesting sites and food sources? Just the wind farm is to blame?
Yep. The windfarm has been the only development in the whole area. There has been extensive study of its impact on the raptor population. The problem with the windfarm, and MOST windfarms, is it was built in a flyway and the hills are and have always been a huge source of bunny rabbits and other critters that the raptors feed on.
So yes in the case of this windfarm we can categorically say IT IS THE ONLY SOURCE OF RAPTOR LETHALITY IN THAT AREA.