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Since my last post I have added a few features to my model, but mostly I have combined a few of my different iterations into a single model.  I started out trying to create a live plot showing three-dimensional trait space and ancestry, but found NetLogo to be uncooperative on the three-dimensional front.  Instead, at Paul's suggestion, I created a two-dimensional trait space plot, with one trait on each axis.  This also meant that I had to incorporate a second trait into my model, which I borrowed from an earlier version.  Then I had to modify all the plots and monitors to run two traits, and also extend setup options to include the second trait.  Part of the new setup is the ability to create two distinct 'groups' and watch how each varies over time.  I also made an option that limits the sume of the two traits, such that one trait can only go up at the cost of the other trait.  The intention was to see if populations would evolve in different directions given different starting points, but I haven't run it enough with the new settings to get an answer.  Perhaps I will use the behaviorspace to put the model through a number of different runs and see what I get.