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Selection and evaluation of projects to conserve ecosystem services

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  • Prato, Tony

Abstract

Climate and land use changes are reducing ecosystem services. Ecosystem managers can alleviate such adverse impacts by being more efficient in allocating limited budgets to projects designed to conserve ecosystem services, and ensuring that implemented projects are effective in stemming losses in ecosystem services. A conceptual framework is developed that managers can use for this purpose. The framework consists of two elements: (1) an a priori optimization model for selecting projects that minimize present value loss in ecosystem services subject to a budget constraint; and (2) an a posteriori model for determining the extent to which implemented projects have decreased ecosystem losses. An optimization model is formulated for three cases, which assume the ecosystem manager: (1) knows for sure how project expenditures influence losses in ecosystem services (certainty case); (2) does not know for sure how project expenditures influence losses in ecosystem services, but is able to specify the probabilities of service losses for different projects (risk case); and (3) is uncertain how project expenditures influence losses in ecosystem services (uncertainty case). Efficient selection of projects is evaluated for two areas of an ecosystem in mathematical and graphical terms using a continuous negative exponential relationship between present value losses and project expenditures for the certainty case, and for five expenditure classes in the risk and uncertainty cases. Two versions of the certainty case are evaluated, weak sustainability and strong sustainability. Weak sustainability allows gains in one ecosystem service to compensate for losses in another ecosystem service; strong sustainability does not. The risk case requires the manager to specify the conditional probabilities for present value losses given project expenditures, and utilizes expected costs and expected budget amounts in the budget constraint. It is solved by allocating the budget among projects so as to equalize the expected marginal present value losses in ecosystem services across projects. The uncertainty case requires the manager to specify ecosystem sustainability states and the present value losses in ecosystem services for combinations of states and projects. It is solved by selecting projects that minimize the maximum present value loss in ecosystem services subject to the budget constraint. The a posteriori evaluation method uses Bayesian statistical inference to test hypotheses about the extent to which implemented projects reduce losses in ecosystem services. It requires specifying ecosystem states that describe conditions for ecosystem services, and decides which hypothesis is true based on posterior probabilities of ecosystem states.

Suggested Citation

  • Prato, Tony, 2007. "Selection and evaluation of projects to conserve ecosystem services," Ecological Modelling, Elsevier, vol. 203(3), pages 290-296.
    • Handle: RePEc:eee:ecomod:v:203:y:2007:i:3:p:290-296
    DOI: 10.1016/j.ecolmodel.2006.11.030
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    1. Prato, Tony, 1999. "Multiple attribute decision analysis for ecosystem management," Ecological Economics, Elsevier, vol. 30(2), pages 207-222, August.
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    2. Boerema, A. & Van Passel, S. & Meire, P., 2018. "Cost-Effectiveness Analysis of Ecosystem Management With Ecosystem Services: From Theory to Practice," Ecological Economics, Elsevier, vol. 152(C), pages 207-218.
    3. Dongyan Guo & Dongyan Wang & Xiaoyong Zhong & Yuanyuan Yang & Lixin Jiang, 2021. "Spatiotemporal Changes of Land Ecological Security and Its Obstacle Indicators Diagnosis in the Beijing–Tianjin–Hebei Region," Land, MDPI, vol. 10(7), pages 1-16, July.
    4. Hone-Jay Chu & Chun-Yu Liu & Chi-Kuei Wang, 2013. "Identifying the Relationships between Water Quality and Land Cover Changes in the Tseng-Wen Reservoir Watershed of Taiwan," IJERPH, MDPI, vol. 10(2), pages 1-12, January.
    5. Watanabe, Marcos D.B. & Ortega, Enrique, 2014. "Dynamic emergy accounting of water and carbon ecosystem services: A model to simulate the impacts of land-use change," Ecological Modelling, Elsevier, vol. 271(C), pages 113-131.

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