Shades of irreplaceability: towards a measure of the contribution of sites to a reservation goal

Pressey, Robert L.; Johnson, I. R.; Wilson, P. D.

doi:10.1007/bf00055941

Cited by 351 publications

(218 citation statements)

References 25 publications

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“…Irreplaceability in a conservation planning exercise was firstly defined by Pressey et al (1994) as the frequency of a given site being chosen in possible alternative solutions that reach the defined conservation targets. However, as recognised by the authors, this definition had the problem of redundancy; that is, even sites that were not crucial to achieve the target would have some irreplaceability value.…”

Section: Data Analysesmentioning

confidence: 99%

Selection of priority areas for arthropod conservation in the Azores archipelago

et al. 2010

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The largest standardised database available to date for arthropods in native forests of the Azores archipelago was used to determine the minimum optimal set of native forest fragments needed to accomplish four different targets of species occurrence (presence-absence) and abundance (20, 50 and 80%) using different groups of arthropods and all data combined. The results showed that occurrence and 20% abundance targets gave similar optimal solutions for most of the groups considered. At least one fragment on each of the seven studied islands was required to accomplish any occurrence and abundance target. To achieve 80% of abundance for all species, all fragments were necessary and to guarantee 50% of the overall abundance of endemics, 17 out of 18 native forests were needed. A suggestion is made to apply a measure of biotic integrity related to disturbance to select, among alternative optimal solutions, the set of areas that will help to guarantee the viability of populations. Some guidelines for the selection of priority areas for conservation in the Azores are presented.

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Section: Data Analysesmentioning

confidence: 99%

Selection of priority areas for arthropod conservation in the Azores archipelago

et al. 2010

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“…The algorithm continued in the same way until all species were included. Pressey et al (1994) coined the term 'irreplaceability' as a measure of a location's contribution to a conservation target (e.g. representation of each species at least once in an MPA) in a planning area.…”

Section: Mpa Selectionmentioning

confidence: 99%

Requirements for marine protected areas to conserve the biodiversity of rocky reef fishes

Gladstone

2006

Aquatic Conservation

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ABSTRACT1. This study describes spatial patterns in the biodiversity (species, assemblages) of rocky reef fishes at a spatial scale relevant to management, and compared the outcomes for this biodiversity from alternative procedures for selecting marine protected areas (MPAs) and from the selection of MPAs for fisheries-related objectives.2. The study area included 104 species in two assemblage types; 36 species and 14 species occurred only in one or two locations respectively.3. MPAs selected by hotspot richness, greedy richness complementarity, and summed irreplaceability included similar percentages of species and significantly more species than randomly selected MPAs. A combined species-assemblage selection ensured representation of assemblage diversity. Representation of all species and assemblage types required 92% of locations.4. MPAs chosen using density of all fishes or density of exploitable fishes as selection criteria included fewer species (than MPAs selected using species identity) and the percentage of species accumulated did not differ from a random selection.5. Use of an established MPA as the seed for an expanded network was inefficient, leading to additional locations being required and an accumulation of species that did not differ from a random selection.6. The smallest MPA network that fulfilled multiple management objectives (representation of assemblage diversity and majority of species, population viability, support for fisheries, connectivity) required 30% of the surveyed locations.7. This study concluded that: MPAs selected without the benefit of data on intra-habitat variation in species assemblages will be unrepresentative; the upper range of currently promoted targets for MPA establishment (i.e. 30%) should be regarded as a minimum for biodiversity conservation; MPAs selected for fisheries-related reasons may not provide expected benefits for the remainder of the fish assemblage.

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“…Restricted-range species are often pivotal in the establishment of conservation reserve systems that focus on complementarity, particularly 'hotspots' of endemism (Pressey et al 1994;Moritz et al 2001;Woinarski et al 2006). So, while the high rainfall islands (>1000 mm) were more similar in terms of their community composition, they also contained the highest number of Northern Kimberley (NK) endemic species (range: 11-51), and this is particularly true of Augustus, Bigge and Boongaree islands (43, 51 and 44 endemics, respectively).…”

Section: Conservation Implicationsmentioning

confidence: 99%

Biogeographic patterns on Kimberley islands, Western Australia

Gibson¹

2014

Rec West Aust Mus Sup

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-Australia's islands play a signifi cant role in the conservation of its biota. The near-pristine islands along the Kimberley coast of north-western Australia are important natural refuges that have been relatively isolated from many of the threatening processes affecting the adjacent mainland. Between 2007 and 2010, 24 of the largest of these islands were surveyed for non-volant mammals, reptiles, birds, frogs, bats, land snails and vascular plants. To facilitate the setting of conservation priorities, I examined congruence in the biogeographic patterns among these taxonomic groups and related those to island-wide attributes. A high level of congruence in both spatial patterns of species richness and community similarity across most of the taxonomic groups was found. Congruence in species richness was best explained by a strong relationship with island area; while congruence in community similarity was infl uenced by the dispersal ability of taxa. Average annual rainfall and the extent of rock scree (or ruggedness) on an island were also strong correlates of both spatial patterns in community similarity and richness of regional endemics. I also show that this pattern was not explained by richness differences of species between islands alone, but largely due to species replacement among islands. These patterns refl ect the greater diversity of regional endemic species and/or habitat specialists that are restricted to the relatively high rainfall and extensively rocky islands; whereas the drier islands typically support widespread generalists that have distributions that extend into the semi-arid and arid zones. In terms of conservation signifi cance, the largest islands in the most mesic section of the coast are important for their high species diversity, including regional endemics. However, the lower rainfall islands support unique assemblages, and some are also important for their threatened mammal species. The high level of island endemism of the camaenid land snails indicates that all the islands sampled are important in terms of representing their diversity. The results of the survey also support the hypothesis that these islands are microcosms of the adjacent Northern Kimberley mainland with 74% of mammal, 59% of reptile, 70% of frog, 69% of bird and 49% of plant species of the Northern Kimberley bioregion now known on the islands sampled. Future management of the islands requires strategies that minimise the risk of incursions by exotic species and appropriate fi re regimes to preserve habitat quality.

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Shades of irreplaceability: towards a measure of the contribution of sites to a reservation goal

Cited by 351 publications

References 25 publications

Selection of priority areas for arthropod conservation in the Azores archipelago

Selection of priority areas for arthropod conservation in the Azores archipelago

Requirements for marine protected areas to conserve the biodiversity of rocky reef fishes

Biogeographic patterns on Kimberley islands, Western Australia

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