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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

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

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	Extent (% of site)
agriculture	-
hunting	-
military	-
tourism/recreation	-
urban/industrial/transport	-
water management	-

For further information about the land use classification please click here.

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