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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
Ferruginous Duck Aythya nyroca	NT	breeding	2002	1-2 breeding pairs	B2, C6
Purple Swamphen Porphyrio porphyrio	LC	resident	2000	6-10 breeding pairs	C6
Eurasian Spoonbill Platalea leucorodia	LC	passage	2001	30 individuals	B1i, B2, C6
Eurasian Spoonbill Platalea leucorodia	LC	winter	2001	30 individuals	B1i, B2, C6
Common Little Bittern Ixobrychus minutus	LC	breeding	2001	4-6 breeding pairs	C6
Purple Heron Ardea purpurea	LC	breeding	2001	3-7 breeding pairs	C6
Black-winged Stilt Himantopus himantopus	LC	resident	2001	300 breeding pairs	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	likely in short term (within 4 years)	whole area/population (>90%)	very rapid to severe deterioration	very high
Human intrusions and disturbance	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Pollution	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high

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10%)	A management plan exists but it is out of date or not comprehensive	Some limited conservation initiatives are in place	not assessed

Habitat1	Habitat detail	% of IBA
Marine Coastal/Supratidal		major (>10)
Artificial/Terrestrial	Perennial crops, orchards and groves, Other urban and industrial areas, Arable land	-
Marine Intertidal		-

1. IUCN Habitat classification.

Land use	% of IBA
agriculture	-
fisheries/aquaculture	-
tourism/recreation	-
urban/industrial/transport	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Pera marsh (Portugal). Downloaded from https://datazone.birdlife.org/site/factsheet/pera-marsh-iba-portugal on 23/11/2024.