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- Moraes, Rosana, 1968
(författare)
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A Procedure for Ecological Tiered Assessment of Risks (PETAR)
- 2002
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Institutions in developed countries have proposed several Ecological Risk Assessment (ERA) procedures, and the majority of study cases have been carried out there. The use of (often expensive) existing ERA procedures in developing countries is questionable given their limited resources and scarce background information of relevance for risk assessments. There is an obvious need to adapt existing ERA procedures to account for data gaps and constrains on the acquisition of new data without compromising the scientific value of the assessment. This thesis presents a "Procedure for Ecological Tiered Assessment of Risks" (PETAR), which consists of a three-tiered evaluation of risks, successive tiers requiring more detailed investigations. The tiered approach assures that resources available for site-specific investigations are directed toward answering well formulated questions raised during the early stages of the assessment. The first tier, the preliminary assessment, is a qualitative evaluation of existing information on stressors, sources of stressors and expected ecological effects. The second tier is the regional risk assessment, a semi-quantitative evaluation of ecological risks posed by environmental problems over large geographical areas, which results in a ranking of sources and stressors having the greatest potential for ecological impact and subareas inside the study area more likely to be impacted. The final tier is a local risk assessment, a quantitative assessment of ecological risks posed by environmental problems over small geographical areas that incorporates methodologies for establishing causality between exposure to multiple stressors and effects on endpoints of ecological relevance. The applicability of the PETAR procedure was verified by a case study conducted in a reserve of the Atlantic rain forest in Brazil. Results of the evaluation of risks at the regional scale can be used by the reserve administration to establishing conservation priorities. The evaluation of risks at the local scale effectively assessed the causes and consequences of environmental degradation in a small geographic area.
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- Moraes, Rosana, 1968, et al.
(författare)
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A Procedure for Ecological Tiered Assessment of Risks (PETAR)
- 2004
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Ingår i: Human and Ecological Risk Assessment (HERA). - : Informa UK Limited. - 1549-7860 .- 1080-7039. ; 10:2, s. 349-371
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Tidskriftsartikel (refereegranskat)abstract
- Several procedures for Ecological Risk Assessment (ERA) have been suggested. The use of these existing procedures often relies on availability of existing data and/or on large resources for acquisition of new ones. This paper presents a three-tiered procedure for retrospective evaluation of risks adapted to limited resources and scarce background information of relevance for risk assessments, such as in developing countries. The tiers require successively more detailed investigations. The approach assures that resources available for site-specific investigations are directed towards well-formulated questions raised during previous stages of the assessment. The first tier, the preliminary assessment, is a qualitative evaluation of existing information on anthropogenic stressors, sources of stressors and expected ecological effects. The second tier is a regional risk assessment; a semi-quantitative evaluation of ecological risks, over large geographical areas, which results in a ranking of sources and stressors having the greatest potential for ecological impact and ranking of sub-areas inside the study area more likely to be impacted. The final tier is a site-specific and quantitative risk assessment, at a smaller scale and requiring more resources, that incorporates methodologies for establishing causality between exposure to multiple stressors and effects on specific endpoints of ecological and societal relevance.
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