Species with a geographically restricted area of distribution.
Note: Within the International Finance Corporation's Performance Standard 6, restricted range refers to a limited extent of occurence (EOO):
• For terrestrial vertebrates and plants, restricted-range species are defined as those species that have an EOO less than 50,000 square kilometres (km²).
• For marine systems, restricted-range species are provisionally being considered those with an EOO of less than 100,000 km2.
• For coastal, riverine, and other aquatic species in habitats that do not exceed 200 km width at any point (for example, rivers), restricted range is defined as having a global range of less than or equal to 500 km linear geographic span (i.e., the distance between occupied locations furthest apart).
Adapted from International Finance Corporation (IFC) 2012 1
Species with world distributions of less than 50,000km2.Species having a global range size less than or equal to the 25th percentile of range-size distribution in a taxonomic group within which all species have been mapped globally, up to a maximum of 50,000 km².
IUCN 2016 2
Note: BirdLife International use this criteria in the context of Endemic Bird Areas.
Adapted from BirdLife International 2008 3
References & Websites
- IFC (2012) Guidance Note 6 Biodiversity Conservation and Sustainable Management of Living Natural Resources. International Finance Corporation, Washington DC, U.S.A
- IUCN (2016). A Global Standard for the Identification of Key Biodiversity Areas, Version 1.0. First edition. Gland, Switzerland: IUCN.
- Birdlife International (2008) Global IBA Criteria.