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The site was identified as internationally important for bird conservation 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 List	Season (year/s of estimate)	Size	IBA criteria
Common Little Bittern Ixobrychus minutus	LC	breeding (-)	frequent	C6
Purple Heron Ardea purpurea	LC	breeding (2002)	150–200 pairs	B2, C6
Pied Avocet Recurvirostra avosetta	LC	winter (2002)	800–1,800 birds	A4i, B1i, B2, C2, C6
Black-winged Stilt Himantopus himantopus	LC	breeding (1996)	50–100 pairs	C6
Common Ringed Plover Charadrius hiaticula	LC	winter (2002)	800–1,800 birds	A4i, B1i
Kentish Plover Charadrius alexandrinus	LC	breeding (1995)	common	B3
Kentish Plover Charadrius alexandrinus	LC	winter (2002)	660–6,000 birds	A4i, B1i, C3
Dunlin Calidris alpina	NT	winter (2002)	7,800–10,700 birds	B3, C3
Little Tern Sternula albifrons	LC	breeding (1996)	10–15 pairs	C6
Western Marsh-harrier Circus aeruginosus	LC	resident (1999)	13 pairs	C6
A4iii Species group - waterbirds	n/a	winter (2002)	min 20,000 birds	A4iii, C4

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2002. The most recent assessment (2005) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Transportation and service corridors	happe­ning now	few indivi­duals/small area (<10%)	rapid decline (>30% over 3 gener­ations)	low

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Not assessed	Not assessed	Not assessed	not assessed

Year	Protected Area	Designation (management category)	% coverage of IBA
1979	Dunas de São Jacinto	Reserva Natural (IV)	1

Habitat	% of IBA	Habitat detail
Marine Neritic	29
Artificial/Terrestrial	13	Arable land
Grassland	10	Humid grasslands
Forest	4	Native coniferous woodland; Alluvial and very wet forest
Marine Coastal/Supratidal	major (>10)
Marine Intertidal	major (>10)

Land use	% of IBA
agriculture	-
fisheries/aquaculture	-
forestry	-
hunting	-
military	-
nature conservation and research	-
tourism/recreation	-
urban/industrial/transport	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Ria de Aveiro (Portugal). Downloaded from https://datazone.birdlife.org/site/factsheet/ria-de-aveiro-iba-portugal on 23/12/2024.