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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') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
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

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2002) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2002. The most recent assessment (2017) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Residential and commercial development	happening now	majority/most of area/population (50-90%)	very rapid to severe deterioration	very high
Transportation and service corridors	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 areas	Management plan	Other action	Result
Little/none of site covered (<10%)	No management planning has taken place	Very little or no conservation action taking place	not assessed

Year	Protected Area	Designation	% overlap with IBA
1988	Estuário do Tejo	Special Protection Area (Birds Directive)	7

Habitat1	Habitat detail	% of IBA
Artificial/Aquatic & Marine		-
Artificial/Terrestrial	Arable land, Other urban and industrial areas	-
Marine Coastal/Supratidal		-
Shrubland	Sclerophyllous scrub, garrigue and maquis	-

1. IUCN Habitat classification.

Land use	% of IBA
agriculture	-
hunting	-
military	-
tourism/recreation	-
urban/industrial/transport	-
water management	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Salinas de Alverca e do Forte da Casa (Portugal). Downloaded from https://datazone.birdlife.org/site/factsheet/salinas-de-alverca-e-do-forte-da-casa-iba-portugal on 23/11/2024.