The project summarized by this report involved a preliminary design of a model for estimating and predicting the quantity and composition of solid waste and a determination of its feasibility. The novelty of the prediction model is that it estimates and predicts on the basis of knowledge of materials and quantities before they become a part of the…

Discusses the objectives of conserving nature, appropriate strategies to reach those objectives, the present situation of formal conservation in South Africa, and the role of research in formulating sound conceptual models of ecosystem structure and function. (MDH)

This paper is concerned with problems in assessing the behavior of trace substances introduced into natural systems, sampling models of five classes that might be used in the study of contaminants are reviewed. Adaptation of an industrial experimentation method and techniques used in economic geology to ecological sampling is recommended.…

Describes methods of designing natural resource monitoring programs to provide indications of ecosystem health, define limits of normal variation, identify abnormal conditions, and suggest potential agent of abnormal change. (MDH)

Disturbance-generated biomass results from endogenous and exogenous natural and cultural disturbances that affect the health and productivity of forest ecosystems. These disturbances can create large quantities of plant biomass on predictable cycles. A systems analysis model has been developed to quantify aspects of system capacities (harvest,…

Major consequences of present and additional environmental quantities of DDT pesticide are predictable by mathematical models of transport, accumulation and concentration mechanisms in the Wisconsin regional ecosystem. High solubility and stability produce increased DDT concentrations at high organism trophic levels within world biosphere…

Discusses the use of the human health risk assessment model as a basis for developing ecological risk assessment (ERA). For ERA, risk to individuals is less important than the survival of the population, with the exception of endangered species. Suggests that ERA take into account the relative reproductive value of the potentially impacted…

A second-year biology class at Sedro-Woolley High School is part of an interdisciplinary program designed to develop a heightened awareness of environmental problems. A model for such a course is explained and evaluated. Students' awareness of values increases through the use of problem-solving techniques, audiovisual aids, articles and books, and…

The ecosystem model is a design process utilizing an ecological approach. The manual presents processes developed and used during on-site campus applications of the model. It illustrates how work on a micro-level ecosystem project can be divided into stages, with instructions for accompanying discussions and process procedures for each. The manual…

In attempting to define the "ecology" of human development, the term's history and connotations are discussed. The ecological approach requires that the person, the environment, and the relations between them be conceptualized in terms of systems, and subsystems within systems. The experimental situation is not limited to being…