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Principles of Ecological Landscape Design
This groundbreaking work explains key ecological concepts and their application to the design and management of sustainable landscapes. It covers topics from biogeography and plant selection to global change. Beck draws on real world cases where professionals have put ecological principles to use in the built landscape.
New Directions for Operations Research in Manufacturing
Basically five problems areas are addressed by operations research specialists in the manufacturing domain: theore- tical and practical aspectsin production planning, facility layout, inventory control, tool management and scheduling. Some of these problems can be solved off-line, while others must be treated as real-time problems impacted by the changing state of the system. Additionally, all of these problems have to be dealt with in an integrated systems framework. Several new topics have recently appeared in the scientific literature which now attract the interest of operations researchers. These include distributed real-time scheduling, hierarchical and heterarchical control systems, in...
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Wildlife Review
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Self Portrait
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A Critique of the Avain 5-day Dietary Test (LC↓5↓0) as the Basis of Avian Risk Assessment
The United States Environmental Protection Agency LC50 test currently provides the endpoints that drive the risk assessment process in a number of countries, including the U.S., because the test is thought to be most representative of exposure conditions in the wild. This paper argues that reliance on the LC50 test as a meaningful endpoint in the risk assessment process is misguided and that the test does not offer useful information, at least for several large classes of insecticides most likely to result in wildlife poisoning incidents. It also considers the test inherently unreliable in that the exact conditions have an inordinate impact on the test endpoints; that the LC50 values obtained are not meaningful per se and appear to be at odds with the available field evidence; and that the test offers little or no insight that would make it worthwhile. Data from tests conducted with mallards and bobwhites using organophosphorus and carbamate insecticides was used as well as the work of Hill and Camardese (1986) on Coturnix.
