The various indices described in this paper need to be compared, and their potential for serving as useful measures of vigor, organization, and resilience needs to be tested. Trophic exchange networks from a wide variety of aquatic ecosystems (Christensen, 1995) will be required for such an analysis. The various measures of vigor, organization, and resilience can then be combined
to form overall ecosystem health plots, and these plots can be compared to hypothetical plots based on existing theory (Ulanowicz, 1986; Odum, 1969) and the results of theoretical modelling studies (Mageau et al., in press).