The following articles may shed some light on this - unfortunately, I have
seen only the abstracts, and do not know what is in the detailed articles:
1. Bird flight characteristics near wind turbines in Minnesota. American
Midland Naturalist 139: 29--38. The abstract says that most birds (82--84%)
flew above or below turbine blades; can one assume that the other 16-18%
flew into the turbine blades? ? the abstract does not say.
2. Bird casualties caused by a wind energy project in an estuary. Bird Study
43: 124--126. No details given in abstract of this project in Holland.
In related type circumstances:
3. A study of bird mortality at a west central Wisconsin TV tower from
1957--1995. Passenger Pigeon 58: 219--235. A total of 121,560 birds of 123
species was killed over the 38 years, with greatest casualties among long
distance Neotropical migrants.
4. Avian behavior and mortality at power lines in coastal South Carolina.
Wildlife Society Bulletin 24: 636--648. Says that fewer birds collide with
power lines that are marked with aviation spheres ? perhaps visual warning
devices are a partial answer.
Can anyone having access to these articles elaborate further?
Ralph Reid
Sydney
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