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be expressed in units of ecosystem condition. We hope the papers in this volume will foster progress toward that ideal.
Cairns, J., Jr., P. V. McCormick, and B. R. Niederlehner. 1993. A proposed framework for developing indicators of ecosystem health. Hydrobiologia 263:1-44.
Daly, H. E., and J. B. Cobb, Jr. 1989. For the Common Good. Boston: Beacon Press.
Hart, D. D. 1994. Building a stronger partnership between ecological research and biological monitoring. Journal of the North American Benthological Society 13:110-116.
Karr, J. R. 1981. Assessment of biotic integrity using fish communities. Fisheries 6:21-27.
Karr, J. R. 1991. Biological integrity: A long-neglected aspect of water resource management. Ecological Applications 1:66-84.
Karr, J. R. 1992. Ecological integrity: Protecting Earth's life support systems. Pp. 223-238 in Ecosystem Health: New Goals for Environmental Management, R. Costanza et al., eds. Washington, D.C.: Island Press.
Lindstedt-Siva, J., L. C. Soileau IV, D. W. Chamberlain, and M. L. Wouch. 1996. Engineering for development in environmentally sensitive areas: Oil operations in a rain forest. Pp. 141-162 in Engineering within Ecological Constraints, P. C. Schulze, ed. Washington, D.C.: National Academy Press.
Schindler, D. W. 1987. Detecting ecosystem responses to anthropogenic stress. Canadian Journal of Fisheries and Aquatic Sciences 44(suppl. 1):6-25.
Schindler, D. W. 1990. Experimental perturbations of whole lakes as tests of hypotheses concerning ecosystem structure and function. Oikos 57:25-41.
Sharpe, R. M. 1995. Another DDT connection. Nature 375:538-539.
Shen, H. W. 1996. Engineering studies based on ecological criteria. Pp. 177-186 in Engineering within Ecological Constraints, P. C. Schulze, ed. Washington, D.C.: National Academy Press.
Solorzano, R., R. deCamino, R. Woodward, J. Tosi, V. Watson, A. Vasquez, C. Villalobos, J. Jimenez, R. Repetto, and W. Cruz. 1991. Accounts Overdue: Natural Resource Depreciation in Costa Rica. Washington, D.C.: World Resources Institute.
Steen, B., and S. O. Ryding. 1992. The EPS Enviro-Accounting Method: An Application of Environmental Accounting Principles for Evaluation and Valuation of Environmental Impact in Production Design. IVL Report B 1080. Göteborg, Sweden: Swedish Environmental Research Institute.
Vitousek, P. M., P. R. Ehrlich, A. H. Ehrlich, and P. A. Matson. 1986. Human appropriation of the products of photosynthesis. BioScience 34:368-373.
Primary production is the production of plant tissue by photosynthesis. Net primary production is gross primary production (the total amount of carbon fixation by photosynthesis) minus respiration (the consumption of the products of photosynthesis) by the plants.