• Summary
• Text account
• Data table and detailed info
• Map
• Reference and further resources

The site was identified as important in 2002 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):

Species	Current IUCN Red List Category	Season	Year(s)	Population estimate at site	IBA criteria met
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

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2002).

Pressure (threats to the trigger species and/or their habitats)
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

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation	Management planning	Other 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 conservation status, please click here

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

Habitat (IUCN level 1)	Habitat detail	Extent (% of site)
Artificial/Aquatic & Marine		-
Artificial/Terrestrial	Arable land, Other urban and industrial areas	-
Shrubland	Sclerophyllous scrub, garrigue and maquis	-
Marine Coastal/Supratidal		-

For more information about the IUCN Habitat classification, please click here.

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

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Salinas de Alverca e do Forte da Casa. Downloaded from http://datazone.birdlife.org/site/factsheet/salinas-de-alverca-e-do-forte-da-casa-iba-portugal on 25/09/2023.