Thanks, Steve. That's helpful and similar to what we're finding
pretty much all over the place (meaning N. America, in particular).
Bernie
>Friends: After several decades of watching populations of birds,
>butterflies, and several other taxa, the thing I'm most impressed with
>is how variable populations are. This is especially true among the
>species with high reproductive potential (many insects, for example).
>
>Still, there seems to be little doubt about the long term trend for bird
>populations. Here's my only ref. on the subject:
>
>
>=================
>Bird Population Changes in a Hamilton County, Ohio, Forest
>
>LAUREN P. SAUNDERS, CHARLES W. SAUNDERS, DAVID STYER, AND STEPHAN
>PELIKAN, Department of Mathematics, University of Cincinnati,
>Cincinnati, OH 45221-0025
>
>ABSTRACT. We monitored breeding bird populations in a woodland plot in
>Hamilton County, OH. By comparing historical data (1991-8) with 2003
>populations, we observed a decrease in the populations of more species
>than expected by chance. In contrast, few species showed a population
>increase. Overall, the total number of territorial males in 2003 was 12%
>below the average number from 1991 to 1998. OHIO J SCI 105 (3):43-45, 2005
>
>OHIO J SCI 105 (3):43-45, 2005
>=================
>Cheers!
>
>Steve P
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
>
--
Wild Sanctuary
P. O. Box 536
Glen Ellen, CA 95442
t. 707-996-6677
f. 707-996-0280
http://www.wildsanctuary.com
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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