Abstract
Ecosystem studies of environmental quality are complicated by the imprecise nature of many ecological interrelationships and the subjectivity which is inherent in judgements by field observers. Many analyses of ecosystems require hierarchical decision-making processes which involve variables from social, economic and ecological sectors that are seemingly incompatible. Fuzzy set theory has been developed for and applied to problems involving complex systems like ecosystems. For example, government agencies who make habitat evaluations for wildlife can use techniques developed in fuzzy set theory for the combination of disparate variables that are required for decision-making at an ecosystem level. Another application of fuzzy set theory has generated a classification scheme for wetlands which is based on the knowledge of wetland experts. Fuzzy compartmentalization of ecosystem components allows greater diversity of behavior tha deterministic or probabilistic methods.
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