One that I do not have a direct answer for simply because I have not studied it in depth and can only comment from basic observations. The foothills are definately in danger and as one of our richest areas of biodiversity we should all be concerned. In fact, pretty much all of California is under pressure from migration and overpopulation and having the 6th? largest economy in the world (LAO's 2004 fact sheet)and a population growth of over 500,000 people annually isn't helping matters Is there any other info you can link us to? I will check out the book in the mean time but this is a very important issue and one I would like to know more about so that I may vote for the right measures as they come about. ;)