Abstract
The U.S. Environmental Protection Agency (EPA) has embraced a new strategy of environmental protection that is place-driven rather than program-driven. This new approach focuses on the protection of entire ecosystems. To develop an effective strategy of ecosystem protection, however, EPA will need to: (1) determine how to define and delineate ecosystems and (2) categorize threats to individual ecosystems and priority rank ecosystems at risk. Current definitions of ecosystem in use at EPA are inadequate for meaningful use in a management or regulatory context. A landscape-based definition that describes an ecosystem as a volumetric unit delineated by climatic and landscape features is suggested. Following this definition, ecosystems are organized hierarchically, from megaecosystems, which exist on a continental scale (e.g., Great Lakes), to small local ecosystems.
Threats to ecosystems can generally be categorized as: (1) ecosystem degradation (occurs mainly through pollution) (2) ecosystem alteration (physical changes such as water diversion), and (3) ecosystem removal (e.g., conversion of wetlands or forest to urban or agricultural lands). Level of threat (i.e., how imminent), and distance from desired future condition are also important in evaluating threats to ecosystems. Category of threat, level of threat, and “distance” from desired future condition can be combined into a three-dimensional ranking system for ecosystems at risk. The purpose of the proposed ranking system is to suggest a preliminary framework for agencies such as EPA to prioritize responses to ecosystems at risk.
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Literature Cited
Albert D. A., S. R. Denton, and B. V. Barnes. 1986. Regional landscape ecosystems of Michigan. School of Natural Resources, University of Michigan, Ann Arbor, 32 pp.
Allen T. F. H., and T. B. Starr. 1982. Hierarchy: Perspectives for ecological complexity. University of Chicago Press, Chicago, 310 pp.
Bailey, R. G. 1983. Delineation of ecosystem regions.Environmental Management 7:365–373.
Bailey, R. G. 1985. The factor of scale in ecosystem mapping.Environmental Management 9:271–276.
Bailey, R. G. 1987. Suggested hierarchy of criteria for multiscale ecosystem mapping.Landscape and Urban Planning 14:313–319.
Barnes, B. V., K. S. Pregitzer, T. A. Spies, and V. H. Spooner. 1982. Ecological forest site classification.Journal of Forestry 80:493–498.
Begon, M. E., J. L. Harper, and C. R. Townsend. 1990. Ecology: Individuals, populations and communities. Blackwell Scientific Publications, Boston, 945 pp.
EPA (US Environmental Protection Agency). 1987. Unfinished business: A comparative assessment of environmental problems. 230/2-87-025A. February 1987. Office of Policy, Planning and Evaluation. Washington, DC, 100 pp.
EPA (US Environmental Protection Agency). 1990a. Reducing risk: Setting priorities and strategies for environmental protection. SAB-EC-90-021. September 1990. Science Advisory Board, Washington, DC.
EPA (US Environmental Protection Agency). 1990b. The report of the ecology and welfare subcommittee; reducing risk, appendix A. EPA SAB-EC-90-021A. September 1990. Science Advisory Board. Washington, DC, 77 pp.
EPA (US Environmental Protection Agency). 1992. Framework for ecological risk assessment. EPA/630/R-92/001. February 1992. Risk assessment forum. Washington, DC, 41 pp.
EPA (US Environmental Protection Agency). 1993. A guidebook to comparing risks and setting environmental priorities. EPA 230-B-93-003. September 1993. Office of Policy, Planning and Evaluation, Washington, DC, 199 pp.
EPA (US Environmental Protection Agency). 1994. The new generation of environmental protection: EPA's five year strategic plan. EPA 200-B-94-002. July 1994. Office of the Administrator, Washington, DC, 167 pp.
EPA (US Environmental Protection Agency). Region III. No date. Comparative risk project: A risk-based assessment of environmental problems. Region III, US Environmental Protection Agency, Philadelphia, 46 pp.
Grumbine, R. E. 1994. What is ecosystem management?Conservation Biology 8:27–38.
King, A. W. 1993. Considerations of scale and hierarchy. Pages 19–46in S. Woodley, J. Kay, and G. Francis (eds.), Ecological integrity and the management of ecosystems. St. Lucie Press, 220 pp.
Klijn, F., and H. A. Udo de Haes. 1994. A hierarchical approach to ecosystems and its implications for ecological land classification.Landscape Ecology 9:89–104.
MacKenzie, S. 1994. Great Lakes intergovernmental cooperation: A framework for endangered species conservation.Endangered Species Update 10(3&4):48–51.
Odum, E. P. 1971. Fundamentals of ecology. W. B. Saunders, Philadelphia, 574 pp.
Omernik, J. M. 1987. Ecoregions of the coterminous United States.Annals of the Association of American Geographers 77:118–125.
O'Neill, R. V., D. L. DeAngelis, T. F. H. Allen, and J. B. Waide. 1986. A hierarchical concept of ecosystems. Monographs in population biology. Princeton University Press, Princeton, NJ, 272 pp.
O'Neill, R. V., A. R. Johnson, and A. W. King. 1989. A hierarchical framework for the analysis of scale.Landscape Ecology 3:193–205.
Platt, J. 1969. Theorems on boundaries in hierarchical systems. Pages 201–214in L. L. Whyte, A. G. Wilson, and D. Wilson (eds.), Hierarchical structures. American Elsevier, New York, 322 pp.
Ricklefs, R. E. 1983. The economy of nature. Chiron Press, New York, 510 pp.
Rowe, J. S. 1961. The level-of-integration concept and ecology.Ecology 42:420–427.
Rowe, J. S., and B. V. Barnes 1994. Geo-ecosystems and bioecosystems.Bulletin of the Ecological Society of America 75:36–38.
Rowe, J. S., and J. W. Sheard. 1981. Ecological land classification: A survey approach.Environmental Management 5:451–464.
Simon, H. A. 1962. The architecture of complexity.Proceedings of the American Philosophical Society 106:467–482.
Spurr, S. H., and B. V. Barnes, 1980. Forest ecology. John Wiley & Sons, New York, 687 pp.
Suter, G. W. 1993. Ecological risk assessment. Lewis Publishers, Chelsea, Michigan, 538 pp.
Suter, G. W., and S. Bartell. 1993. Ecosystem-level effects. Pages 275–308in G. W. Suter (ed.), Ecological risk assessment. Lewis Publishers, Chelsea, Michigan, 538 pp.
Swanson, F. J., T. K. Kratz, N. Caine, and R. G. Woodmansee. 1988. Landform effects on ecosystem patterns and processes.BioScience 38:92–98.
TNC (The Nature Conservancy) 1994. The conservation of biological diversity in the Great Lakes ecosystem: issues and opportunities. The Nature Conservancy Great Lakes Program. The Nature Conservancy, Chicago, 118 pp.
Wiens, J. A. 1989. Spatial scaling in ecology.Functional Ecology 3:385–397.
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Gonzalez, O.J. Formulating an ecosystem approach to environmental protection. Environmental Management 20, 597–605 (1996). https://doi.org/10.1007/BF01204133
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DOI: https://doi.org/10.1007/BF01204133