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Global IBA Criteria

A1. Globally threatened species
Criterion: The site is known or thought regularly to hold significant numbers of a globally threatened species, or other species of global conservation concern.

Notes: The site qualifies if it is known, estimated or thought to hold a population of a species categorized by the IUCN Red List as Critically Endangered, Endangered or Vulnerable. In general, the regular presence of a Critical or Endangered species, irrespective of population size, at a site may be sufficient for a site to qualify as an IBA. For Vulnerable species, the presence of more than threshold numbers at a site is necessary to trigger selection. Thresholds are set regionally, often on a species by species basis. The site may also qualify if holds more than threshold numbers of other species of global conservation concern in the Near Threatened, Data Deficient and, formerly, in the no-longer recognized Conservation Dependent categories. Again, thresholds are set regionally.

A2. Restricted-range species
Criterion: The site is known or thought to hold a significant component of a group of species whose breeding distributions define an Endemic Bird Area (EBA) or Secondary Area (SA).

Notes: This category is for species of Endemic Bird Areas (EBAs).  EBAs are defined as places where two or more species of restricted range, i.e. with world distributions of less than 50,000 km2, occur together.  More than 70% of such species are also globally threatened.  Also included here are species of Secondary Areas.  A Secondary Area (SA) supports one or more restricted-range species, but does not qualify as an EBA because less than two species are entirely confined to it.  Typical SAs include single restricted-range species which do not overlap in distribution with any other such species, and places where there are widely disjunct records of one or more restricted-range species, which are clearly geographically separate from any of the EBAs. 

A3. Biome-restricted species
Criterion: The site is known or thought to hold a significant component of the group of species whose distributions are largely or wholly confined to one biome.

Notes: This category applies to groups of species with largely shared distributions of greater than 50,000 km2, which occur mostly or wholly within all or part of a particular biome and are, therefore, of global importance.  As with EBAs, it is necessary that a network of sites be chosen to protect adequately all species confined to each biome and, as necessary, in each range state in which the biome occurs.  The 'significant component' term in the Criterion is intended to avoid selecting sites solely on the presence of one or more biome-restricted species that are common and adaptable within the EBA and, therefore, occur at other chosen sites.  Additional sites may, however, be chosen for the presence of one or a few species which would, e.g. for reasons of particular habitat requirements, be otherwise under-represented.

A4. Congregations
Criteria: A site may qualify on any one or more of the four criteria listed below:

i). Site known or thought to hold, on a regular basis,  1% of a biogeographic population of a congregatory waterbird species.
ii). Site known or thought to hold, on a regular basis,  1% of the global population of a congregatory seabird or terrestrial species.
iii). Site known or thought to hold, on a regular basis,  20,000 waterbirds or  10,000 pairs of seabirds of one or more species.
iv). Site known or thought to exceed thresholds set for migratory species at bottleneck sites.

Notes
i. This applies to 'waterbird' species as defined by Delaney and Scott (2006) Waterbird Population Estimates, Fourth Edition, Wetlands International, Wageningen, The Netherlands, and is modelled on Criterion 6 of the Ramsar Convention for identifying wetlands of international importance. Depending upon how species are distributed, the 1% thresholds for the biogeographic populations may be taken directly from Delaney & Scott, they may be generated by combining flyway populations within a biogeographic region or, for those for which no quantitative thresholds are given, they are determined regionally or inter-regionally, as appropriate, using the best available information.
ii. This includes those seabird species not covered by Delaney and Scott (2002). Quantitative data are taken from a variety of published and unpublished sources.
iii. This is modelled on Citerion 5 of the Ramsar Convention for identifying wetlands of international importance.
iv. Thresholds are set regionally or inter-regionally, as appropriate.