I model, equally well to the data. If the former, a Type II model is often justified, whereas if the latter is true, then a Type III model may be the most realistic choice. These are clearly important parameters to consider when studying predation, but other factors can be important as well. In particular, the size of an individual organism in relation to its environment and other organisms present matters. The Reynolds number governs how size affects, among other things, an organism's ability to move through viscous media like air or water.
Body size is also important in ecological interactions.
They developed a model that could be used to predict at what body size an organism, given a choice of alternate habitats, would optimally switch from one habitat to another. The model casts the question of evolutionary fitness as a trade-off of the benefits vs costs of living in one place or moving to an alternative area. The insights of this model are easily shown with graphical comparisons. As the fish grows, however, the food in H1 is less well suited, and eventually H2 presents a better environment in terms of growth. Growth rate is a good parameter to track, because it integrates all of these various biotic and abiotic factors.