Economic Valuation of a Mangrove Ecosystem Threatened by Shrimp Aquaculture in Sri Lanka

被引:0
作者
M. Gunawardena
J. S. Rowan
机构
[1] Lancaster University,Environmental Science Department
[2] University of Dundee,Environmental Systems Research Group Department of Geography
来源
Environmental Management | 2005年 / 36卷
关键词
Shrimp aquaculture; Mangroves; Total economic value and extended cost–benefit analysis; Sri Lanka;
D O I
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中图分类号
学科分类号
摘要
Mangrove ecosystems in Sri Lanka are increasingly under threat from development projects, especially aquaculture. An economic assessment is presented for a relatively large (42 ha) shrimp culture development proposed for the Rekawa Lagoon system in the south of Sri Lanka, which involved an extended cost–benefit analysis of the proposal and an estimate of the “total economic value” (TEV) of a mangrove ecosystem. The analysis revealed that the internal benefits of developing the shrimp farm are higher than the internal costs in the ratio of 1.5:1. However, when the wider environmental impacts are more comprehensively evaluated, the external benefits are much lower than the external costs in a ratio that ranges between 1:6 and 1:11. In areas like Rekawa, where agriculture and fisheries are widely practiced at subsistence levels, shrimp aquaculture developments have disproportionately large impacts on traditional livelihoods and social welfare. Thus, although the analysis retains considerable uncertainties, more explicit costing of the environmental services provided by mangrove ecosystems demonstrates that low intensity, but sustainable, harvesting has far greater long-term value to local stakeholders and the wider community than large shrimp aquaculture developments.
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页码:535 / 550
页数:15
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[31]  
Paruelo J.(1997)Socio-economic impacts of shrimp culture Aquaculture Research 28 815-252
[32]  
Raskin R. G.(1999)The ecological basis for economic value of seafood production supported by mangrove ecosystems Ecological Economics 29 235-141
[33]  
Sutton P.(2000)Illuminating the need for ecological knowledge in economic valuation of magroves under different management regimes—A critique Ecological Economics 35 135-247
[34]  
van den Belt M.(1994)Modelling economy-ecology linkages in mangroves: Economic evidence for promoting conservation in Bintuni Bay, Indonesia Ecological Economics 10 233-348
[35]  
Davenport J.(2001)Environmental issues in brackish water shrimp aquaculture in Sri Lanka Environmental Management 27 335-435
[36]  
Ekaratne S. U. K.(1997)Disused shrimp ponds: options for redevelopment of mangroves Coastal Management 25 425-undefined
[37]  
Walgama S. A.(undefined)undefined undefined undefined undefined-undefined
[38]  
Lee D.(undefined)undefined undefined undefined undefined-undefined
[39]  
Hills J. M.(undefined)undefined undefined undefined undefined-undefined
[40]  
de la Cruz A. A.(undefined)undefined undefined undefined undefined-undefined