Conservation planning with irreplaceability: does the method matter?
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A number of systematic conservation planning tools are available to aid in making land use decisions. Given the increasing worldwide use and application of reserve design tools, including measures of site irreplaceability, it is essential that methodological differences and their potential effect on conservation planning outcomes are understood. We compared the irreplaceability of sites for protecting ecosystems within the Brigalow Belt Bioregion, Queensland, Australia, using two alternative reserve system design tools, Marxan and C-Plan. We set Marxan to generate multiple reserve systems that met targets with minimal area; the first scenario ignored spatial objectives, while the second selected compact groups of areas. Marxan calculates the irreplaceability of each site as the proportion of solutions in which it occurs for each of these set scenarios. In contrast, C-Plan uses a statistical estimate of irreplaceability as the likelihood that each site is needed in all combinations of sites that satisfy the targets. We found that sites containing rare ecosystems are almost always irreplaceable regardless of the method. Importantly, Marxan and C-Plan gave similar outcomes when spatial objectives were ignored. Marxan with a compactness objective defined twice as much area as irreplaceable, including many sites with relatively common ecosystems. However, targets for all ecosystems were met using a similar amount of area in C-Plan and Marxan, even with compactness. The importance of differences in the outcomes of using the two methods will depend on the question being addressed; in general, the use of two or more complementary tools is beneficial.
KeywordsBiodiversity Conservation Planning C-Plan Irreplaceability Marxan Reserve compactness
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This study was funded by a Queensland Environmental Protection Agency Research Grant and Hugh Possingham’s ARC Discovery Grant (2002), and the data were provided by the Queensland Herbarium. The following people also deserve thanks for helpful discussions and assistance: Ian Ball, Jeremy Thompson, Mal Ridges, Matt Watts, Emily Nicholson and Romola Stewart.
- Ball IR, Possingham HP (2000) Marxan version 1.8.3. http://www.ecology.uq.edu.au/marxan.htm#1
- Ball IR, Possingham HP (2002) The design of marine protected areas: adapting terrestrial techniques. In: Modsim, Canberra, pp 769–774Google Scholar
- EPA (Environmental Protection Agency, Queensland) (2001) Vegetation Communities and Regional Ecosystems: Vegetation Management Act Release June 2001, Version 3.0. Queensland Herbarium, Environmental Protection Agency, BrisbaneGoogle Scholar
- Faith DP, Walker PA (1996) Integrating conservation and development: effective trade-offs between biodiversity and cost in the selection of protected areas. Biol Conserv 5(4):431–446Google Scholar
- Ferdana Z (2002) Approaches to integrating a marine GIS into The Nature Conservancy’s ecoregional planning process. In: Breman J (eds) Marine geography: GIS for oceans and seas. ESRI, Redlands WA, pp 151–158Google Scholar
- GBRMPA (Great Barrier Reef Marine Park Authority) Representative Areas in the Marine Park. http://www.gbrmpa.gov.au/corp_site/key_issues/conservation/rep_areas/? rep_areas_overview.html
- New South Wales National Parks and Wildlife Service (NSW NPWS) (1999) The Conservation Planning System (C-Plan) version 3.11. http://www.members.ozemail.com.au/∼cplan/
- Pressey RL (1998) Algorithms, politics and timber: an example of the role of science in a public, political negotiation process over new conservation areas in production forests. In: Wallis RT, Hobbs J (eds) Ecology for everyone: communicating ecology to scientists, the public and the politicians, Chapter 16, Surrey Beaty and Sons, pp 75–87Google Scholar
- Pressey RL, Johnson IR, Wilson PD (1994) Shades of irreplaceability: towards a measure of the contribution of sites to a reservation goal. Biol Conserv 3:242–262Google Scholar
- Richardson KS, Funk VA (1999) An approach to designing a systematic protected area system in Guyana. Parks 9(1):7–16Google Scholar
- Rodrigues ASL, Akçakaya HR, Andelman SJ, Bakarr MI, Boitani L, Brooks TM, Fishpool LDC, da Fonseca GAB, Gaston KJ, Hoffmann M, Long J, Marquet PA, Pilgrim JD, Pressey RL, Schipper J, Sechrest W, Stuart SN, Underhill LG, Waller RW, Watts MEJ, Yan X (2004) Global gap analysis: priorities for expanding the global protected area network. BioScience 54:1092–1100Google Scholar
- Sattler PS, Williams RD (eds) (1999) The Conservation Status of Queensland’s Bioregional Ecosystems. Environmental Protection Agency, BrisbaneGoogle Scholar
- Soule ME (1986) Conservation biology. Sinauer, Sunderland, Massachusetts, USAGoogle Scholar