New 2002 paper

[StephanPickering@cs.com]

Douglas S. Glazier & Sara E. Eckert, 2002. Competitive ability, body size, and geographical range size in small mammals. Journal of Biogeography 29(1):81-92.                                                                     A major test of one of Darwin's pet conceptualizations re: equating migratory range and dominance, championed in the 1980s by J.H. Brown.  As Douglas Glazier  & Sara Eckert document,  taxa with small ranges  dominate over generalist  taxa in  wider territories.  One can, easily, extrapolate their scenario back in time, so to!
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peak: using small ornithopods and small theropods, energy requirements for them being less than  larger taxa whose basal metabolic rates > expanded  foraging/hunting areas.  As Glazier/Eckert note, M.A. Bowers & L.C. Harris in 1994 (A large-scale metapopulation model of interspecific competition and environmental change, Ecological Modelling 72:251-273) elucidated that generalists are engendered by environmental variances, and specialists have efficiencies in utilizing resources at hand (or manus). Thus, it is feasible a balance was existing in dinosaur ecologies between r- and K-selection processes, between niche and distribution (cf. H.R. Pulliam 2000, On the relationship between niche and distribution, Ecology Letters 3:349-361), effecting the ecomorphologies of insects, dinosaurs, pterosaurs, whose existences were  intertwined.