Ecological Modeling in Risk Assessment - Chapter 14 pot
Ecological Modeling in Risk Assessment - Chapter 14 pot
... INVESTMENT TRADE-OFFSInvestments in enhancing the use of ecological models in environmental decision-making involve three trade-offs represented by the diamond-shaped boxes in Figure 14. 1 (Ginzburg ... limiting factor. The third trade-off is between integrating existing models and creating new models (Fig-ure 14. 1). Integrating existing models results in models with enhanced capabilities in ... ecological modeling in decision-making. In V. Dale, Ed., Ecological Modeling for Environmental Management, Springer-Verlag, New York. Redrawn with permission.)Figure 14. 2 Efficient investment approach...
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Ecological Modeling in Risk Assessment - Chapter 11 potx
... modeling (Nestler 2001, pers. comm.).The modeling strategy inherent in CEL HYBRID has subtle problems in maintaining conser-vation when any sources or sinks are present and a problem with inflation ... the biology. An individual-based population model is a specific example of the broader CEL HYBRID approach to modeling. What individual-based modeling does for population modeling, CEL HYBRID ... of organisms in different environments.Treatment of Uncertainty — LOW — In principle, one could introduce uncertainty and risk analysis into CEL HYBRID by enclosing the model within a Monte Carlo...
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Ecological Modeling in Risk Assessment - Chapter 1 pps
... applied in this way.So far, we have discussed the use of ecological modeling in evaluating the ecological signifi-cance of risks to individual organisms. In addition to its use in risk characterization, ... an ecological model.Define Ecological Modeling ObjectivesThe objectives of ecological modeling in the context of a chemical risk assessment are determined partly by the objectives of the assessment. ... contamination at a site).Finally, the use of ecological modeling in determining the ecological significance of estimated risks is not limited to the population level. If a true population-level risk...
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Ecological Modeling in Risk Assessment - Chapter 5 docx
... it.Relevance — HIGH — Possible endpoints include expected population size (age- or stage-specific), risk of decline, risk of extinction, and expected crossing time (the time at which the population ... is included.Relevance — HIGH — Possible endpoints include expected population size (age- or stage-specific), lambda, lambda-based measures such as sensitivity and elasticity, and risk of extinction. ... sensitivity-based methods, such as decomposition of the change in lambda, into the language of risk. Such sensitivity-based applications are used to identify age-specific or stage-specific manage - ment...
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Ecological Modeling in Risk Assessment - Chapter 7 pptx
... extinction), a generic metapopulation model (Possingham and Davies 1995)• Meta-X, an occupancy status model currently being developed (UFZ and OFFIS 2000) In this chapter, we also included individual-based ... Gilpin and Hanski (1991), Breininger et al. (in press), and Akçakaya and Sjögren-Gulve (2000).We review two occupancy-type models and four software platforms for spatially structured modeling ... results include risk of extinction, risk of decline, time to extinction, time to decline, metapopulation occupancy, local occupancy duration, expected abundance, and expected variation in abundance....
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Ecological Modeling in Risk Assessment - Chapter 8 doc
... unclear.Relevance — HIGH — Potential endpoints include the expected population size of any population in the model, risk of decline, risk of extinction, and expected crossing time (the time at which ... collected.POPULATION-DYNAMIC FOOD-CHAIN MODELSThese models are constructed by using predator–prey models (in differential equation form) with equations modeling the dynamics of a toxic chemical. Population-dynamic ... LLCTable 8.1 Internet Web Site Resources for Food-Web ModelsModel Name Description Reference Internet Web SitePopulation-dynamic food-chain modelsA combination of predator–prey models (in differential...
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Ecological Modeling in Risk Assessment - Chapter 9 pps
... model are relevant to ecological risk assessment. The examination of direct and indirect effects of stressors (e.g., entrain - ment) is of high interest in ecological risk assessment. Although ... LEEM was initiated by the International Joint Commission to aid in anticipating the effects of declining nutrient loading, invasion of zebra mussels, loading of toxic organic contaminants on ... proficiency in DYNAMO and FORTRAN programming languages and requires resources for placing the model in an uncer - tainty analysis framework.ECOWINEcoWin is an object-oriented approach to the modeling...
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Ecological Modeling in Risk Assessment - Chapter 10 docx
... capabilities include forecasting vegetative structure, assessing wildlife habitat, analyzing fire hazard, determining forest health risk, and monitoring ecological processes. Using a parallel processing ... developing silvicultural prescriptions, evaluating management scenar - ios, updating inventory information, and providing input to forest planning models (USDA 1999 and references therein). Additional ... Crassulacean acid-dependent succulents)Semi-arid rangeland in Texas and Colorado; user-definedHanson et al. (1988)IslandMulti-timescale community dynamicsUser-defined avian species User-defined...
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Ecological Modeling in Risk Assessment - Chapter 13 pdf
... discrete or continuous-time) and deterministic life-history matrix models are most appropriate for screening-level ecolog - ical risk assessments (Table 13.1). Some simple food-web models, founded ... 2Endpoints: Expected future abundance, risk of decline in abundance, risk of extinction, time to extinction, time to decline, toxicant concentration in the environment, toxicant concentration in ... which software package is being used); possibilities include expected future abundance, risk of decline in abundance, risk of extinction, time to extinction, time to decline, harvested biomass,...
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Ecological Modeling in Risk Assessment - Chapter 15 pdf
... assessing the significance of estimated risks initially expressed in terms of individual-level end - points. In this mode, ecological models aid in translating risks for individual-level endpoints ... cost-effective approach for addressing many risk assessment issues (Ferson et al. 1996; Barnthouse 1998). Indeed, incorporation of simple, scalar population modeling into screening-level ecological ... species constituting an interacting population). Although they ignore biological com - plexity, they are tractable and widely accepted, and their use in screening-level ecological risk assessments...
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