[Tweeters] Cooper's Hawks & passerines

[pan via Tweeters]

Tweets,

I haven't gone back to find the publication/s, but I recall a presentation by a U. W. researcher about part of a long-term marked Song Sparrow project in Seattle, including Discovery Park.  This was ongoing in the early 1990's, through the return and establishment of Cooper's Hawks as breeders.  He reported that breeding density of Song Sparrows was the same after the hawks, but the demographics of the breeders changed:  shorter lives, more turnover.  I don't know how other elements of the population changed.  

Good birding,

Alan Grenon
Seattle
panmail AT mailfence PERIOD com

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