TnBigBore--I concur that reforestation and a diminution of erosion as compared to the period up to the 1970s or so (there were still lots of fields then which are now fully overgrown) is a significant factor. I think the same situation has adversely affected smallmouth. I know for sure that bronzebacks aren't nearly as widespread in Park waters as was the case when I was younger, whereas specks have greatly extended their range, and by no means all of that has come at the hands of man. Thanks for the insight.
Jim Casada
www.jimcasadaoutdoors.com