There was a great (but long) thread almost 3 years ago:
http://www.pprune.org/tech-log/20728...lers-pull.html
The short answer is: Bernoulli and downwash are intrinsic and inseparable in defining and measuring lift. The downwash is most noticeable downstream of a propeller or helo rotor, but it's there behind a fixedwing bird as well.