Key points are not available for this paper at this time.
Walters, C. J., J. Korman, L. E. Stevens and B. Gold 2000. Ecosystem Modeling for Evaluation of Adaptive Management Policies in the Grand Canyon. Conservation Ecology 4(2):1. https://doi.org/10.5751/ES-00222-040201
Walters et al. (Sat,) studied this question.