I will just make a couple of comments, you can take them for what they are. From my observation a prairie dog town will double in size in about 3 years. This I suppose would depend on rainfall and grass growth. The prairie dog depends a lot on vision for his protection, so he keeps the grass in his area well clipped. The short tender regrowth is his preferred food. This close clipping of grass causes a decrease in the taller type of grass and plants. From my observation buffalo grass seeds may be one of his winter foods.
It seems they travel and seek new areas for towns in the late spring. I believe the ones that move are yearling females. When moving they tend to follow areas where there is no tall grass. Roads and cow trails mostly. It doesn't appear they can run as fast in tall grass and of course they can't see out as well.
After they have been completly killed out of an area, they seem to find the old towns in just a short time. One time we killed 99% of a town using phostoxin, in about 90 days they were back.