Ria de Aveiro

IBA Criteria

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
Common Little Bittern Ixobrychus minutus LC breeding - frequent C6
Purple Heron Ardea purpurea LC breeding 2002 150-200 breeding pairs B2, C6
Pied Avocet Recurvirostra avosetta LC winter 2002 800-1,800 individuals A4i, B1i, B2, C2, C6
Black-winged Stilt Himantopus himantopus LC breeding 1996 50-100 breeding pairs C6
Common Ringed Plover Charadrius hiaticula LC winter 2002 800-1,800 individuals A4i, B1i
Kentish Plover Charadrius alexandrinus LC breeding 1995 common B3
Kentish Plover Charadrius alexandrinus LC winter 2002 660-6,000 individuals A4i, B1i, C3
Dunlin Calidris alpina LC winter 2002 7,800-10,700 individuals B3, C3
Little Tern Sternula albifrons LC breeding 1996 10-15 breeding pairs C6
Western Marsh-harrier Circus aeruginosus LC resident 1999 13 breeding pairs C6
A4iii Species group - waterbirds n/a winter 2002 20,000 individuals A4iii, C4

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

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2005 low not assessed not assessed
Was the whole site covered? No State assessed by unset
Accuracy of information good

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Transportation and service corridors utility & service lines happening now small area/few individuals (<10%) very rapid to severe deterioration low

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Not assessed Not assessed Not assessed not assessed
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Ria de Aveiro Site of Community Importance (Habitats Directive) 33,127 protected area overlaps with site 0
Ria de Aveiro Special Protection Area (Birds Directive) 51,446 protected area overlaps with site 51,378
Pateira de Fermentelos Lake and Águeda and Cértima Valleys Ramsar Site, Wetland of International Importance 1,559 protected area overlaps with site 0
Dunas de São Jacinto Reserva Natural 996 protected area contained by site 681
Dunas de Mira; Gândara e Gafanhas Site of Community Importance (Habitats Directive) 20,529 protected area is adjacent to site 0
Aveiro/ Nazaré Special Protection Area (Birds Directive) 292,929 protected area is adjacent to site 0


IUCN Habitat Habitat detail Extent (% of site)
Forest Native coniferous woodland, Alluvial and very wet forest -
Grassland Humid grasslands -
Wetlands (inland) Water fringe vegetation -
Sea Open Sea -
Artificial/Terrestrial Arable land -
Coastline Tidal rivers & enclosed tidal waters, Sand dunes & beaches, Salt marshes, Mud flats & sand flats, Lagoons -
Marine Neritic -
Marine Intertidal -
Marine Coastal/Supratidal -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
agriculture -
fisheries/aquaculture -
forestry -
hunting -
military -
nature conservation and research -
tourism/recreation -
urban/industrial/transport -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Ria de Aveiro. Downloaded from on 25/03/2023.