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IBA standards

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In order to identify IBA habitats in Europe, twenty criteria were adopted, categorised into three separate geographical levels: global ('A' criteria), European ('B' criteria) and the level of the European Union ('C' criteria).

A: The global level

A1. Species of global conservation concern
The site regularly holds significant number of globally threatened species, or other species of global conservation concern.
A2. Restricted-range species
The site is known or thought to hold significant part of restricted-range species, whose breeding distributions define an Endemic Bird Area (EBA) or Secondary Area (SA).
A3. Biome-restricted species
The site is known or thought to hold significant assemblage of the species whose breeding distributions are largely or wholly confined to one biome.
A4. Bird species that congregate
The site is known or thought to hold, on a regular basis, ≥ 1% of the biogeographic population of congregatory water bird species.
The site is known or thought to hold, on a regular basis, ≥ 1% of the global population of congregatory seabird or terrestrial species.
The site is known or thought to hold, on a regular basis, ≥ 20 000 water birds or 10 000 pairs of seabird of one or more species.
The site is known or thought to be a 'bottleneck' site, where at least 20 000 storks (Ciconiidae), raptors (Accipitriformes and Falconiformes) or cranes (Gruidae) regularly pass during spring or autumn migration.

B: European level

B1. Congregations
The site is known or thought to hold ≥ 1% of migratory birds or other clearly defined population of water bird species
The site is known or thought to hold ≥ 1% of clearly defined population of seabird species
The site is known or thought to hold ≥ 1% of migratory birds or other clearly defined population of other congregatory species
The site where over 5,000 storks or over 3,000 raptors or cranes regularly pass during spring or autumn migration.
B2. Species with an unfavorable conservation status in Europe
The site is one the most important habitats in the country for species with an unfavorable conservation status in Europe (SPEC 2, 3) and for those whose way of site-protection is thought to be appropriate.
B3. Species with a favorable conservation status in Europe
The site is one of the most important habitats in the country for species with a favorable conservation status in Europe, but concentrated in Europe (SPEC 4) and for which the site-protection approach is thought to be appropriate.

C: Europe Union level

C1: Types of global conservation concern
The site regularly holds significant numbers of globally threatened species, or other species of global conservation concern.
C2: Concentration of species threatened at the European Union level
The site is known to regularly hold at least 1% of the population of migratory birds or threatened species population at the European Union level
C3: Congregations of migratory birds not threatened at the EU level
The site is known to regularly hold at least 1% of migratory bird population or migratory birds not considered threatened at the European Union level.
C4: Large congregations
The site is known to regularly hold at least 20,000 migratory water birds and/or 10,000 pairs of migratory seabirds of one or more species.
C5: Bottleneck sites
Bottleneck sites, where at least 5,000 storks and/or at least 3,000 raptors and/or 3,000 cranes regularly pass during spring or autumn migration.
C6: Species threatened at the EU level
The site is one of the five most important in the European region in terms of species or subspecies considered threatened at the EU level
C7: Other ornithological criteria
The site has been designated as a Special Protection Area – SPA, or selected as a candidate for the SPA, based on ornithological criteria.

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