Salinas de Alverca e do Forte da Casa This is an IBA in danger! 

IBA Criteria

Year of most recent IBA criteria assessment: 2002

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Greater Flamingo Phoenicopterus roseus LC winter 2000 1-100 individuals C6
Purple Heron Ardea purpurea LC breeding 2001 common C6
Pied Avocet Recurvirostra avosetta LC resident 2001 1-2 breeding pairs C6
Pied Avocet Recurvirostra avosetta LC winter 2001 10-100 individuals C6
Black-winged Stilt Himantopus himantopus LC resident 2001 40-300 breeding pairs C6
Black-winged Stilt Himantopus himantopus LC winter 2001 1-50 individuals C6
Collared Pratincole Glareola pratincola LC breeding 2001 10-40 breeding pairs B2, C6
Little Tern Sternula albifrons LC breeding 2000 frequent C6
Western Marsh-harrier Circus aeruginosus LC resident 1998 common C6

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2017 very high not assessed not assessed
Was the whole site covered? Yes State assessed by unset
Accuracy of information good

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Residential and commercial development commercial and industrial development happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high
Transportation and service corridors roads and railroads likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Little/none of site covered (<10%) No management planning has taken place Very little or no conservation action taking place not assessed
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Estuário do Tejo Special Protection Area (Birds Directive) 44,772 protected area overlaps with site 16
Estuário do Tejo Site of Community Importance (Habitats Directive) 44,011 protected area is adjacent to site 0


IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater, Standing brackish and salt water, Rivers and streams, Water fringe vegetation -
Artificial/Terrestrial Arable land, Other urban and industrial areas -
Shrubland Sclerophyllous scrub, garrigue and maquis -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
agriculture -
hunting -
military -
tourism/recreation -
urban/industrial/transport -
water management -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Salinas de Alverca e do Forte da Casa. Downloaded from on 31/03/2023.