Evolutionary effects on population densities in a consumer-resource context; some basic theory

If you ignored adaptive evolution, would you be able to predict how an ecological system would respond to environmental change?  Would substituting 'adaptive behavior' for 'evolution'signficantly change your predictions?  Do behavioral changes or shifts in species composition reduce the impact of evolution on populations?  The answers are basically ‘no’  to the first two questions and something more complicated for the third.  The talk will present some new and relatively general theory on whether evolution enhances or counteracts the change in density of a consumer species following an adverse change in the environment.