Database release:

For Special Protection Areas (SPA),
Proposed Sites for Community Importance (pSCI),
Sites of Community Importance (SCI) and
for Special Areas of Conservation (SAC)



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1.1 Type


1.2 Site code


1.3 Site name

Estuário do Sado

1.4 First Compilation date


1.5 Update date


1.6 Respondent:

Name/Organisation:Instituto da Conservação da Natureza e das Florestas, I.P.

1.7 Site indication and designation / classification dates

Date site classified as SPA:1988-03
National legal reference of SPA designationDecreto-Lei nº 384-B/99 de 23 de Setembro


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2.1 Site-centre location [decimal degrees]:


2.2 Area [ha]


2.3 Marine area [%]


2.4 Sitelength [km]:


2.5 Administrative region code and name

NUTS level 2 code Region Name

2.6 Biogeographical Region(s)

Mediterranean (100.00 %)


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3.1 Habitat types present on the site and assessment for them

Annex I Habitat types Site assessment
Code PF NP Cover [ha] Cave [number] Data quality A|B|C|D A|B|C
      RepresentativityRelative SurfaceConservationGlobal
1110  info      0.00   
1130  info      0.00   
1140  info      0.00   
1310  info      0.00   
1320  info      0.00   
1410  info      0.00   
1420  info      0.00   
1430  info      0.00   
2150  info      0.00   
2190  info      0.00   
2230  info      0.00   
2250  info      0.00   
2260  info      0.00   
2270  info      0.00   
3150  info      0.00   
3170  info      0.00   
3280  info      0.00   
4020  info      0.00   
6310  info      0.00   
6420  info      0.00   
91B0  info      0.00   
92A0  info      0.00   
92D0  info      0.00   
9330  info      0.00   
  • PF: for the habitat types that can have a non-priority as well as a priority form (6210, 7130, 9430) enter "X" in the column PF to indicate the priority form.
  • NP: in case that a habitat type no longer exists in the site enter: x (optional)
  • Cover: decimal values can be entered
  • Caves: for habitat types 8310, 8330 (caves) enter the number of caves if estimated surface is not available.
  • Data quality: G = 'Good' (e.g. based on surveys); M = 'Moderate' (e.g. based on partial data with some extrapolation); P = 'Poor' (e.g. rough estimation)

3.2 Species referred to in Article 4 of Directive 2009/147/EC and listed in Annex II of Directive 92/43/EEC and site evaluation for them

Species Population in the site Site assessment
G Code Scientific Name S NP T Size Unit Cat. D.qual. A|B|C|D A|B|C
      MinMax  Pop.Con.Iso.Glo.
BA298Acrocephalus arundinaceus          DD       
BA298Acrocephalus arundinaceus          DD       
BA295Acrocephalus schoenobaenus          DD       
BA297Acrocephalus scirpaceus          DD       
BA297Acrocephalus scirpaceus          DD       
BA168Actitis hypoleucos    18  18       
BA247Alauda arvensis          DD       
BA200Alca torda          DD       
BA229Alcedo atthis          DD       
F1103Alosa fallax          DD 
BA054Anas acuta    4149  4149   
BA056Anas clypeata    1762  1762   
BA052Anas crecca    3173  3173   
BA050Anas penelope    774  774       
BA053Anas platyrhynchos    3103  3103   
BA051Anas strepera    120  120       
BA043Anser anser    16  16       
BA257Anthus pratensis          DD       
BA259Anthus spinoletta          DD       
BA029Ardea purpurea    10   
BA169Arenaria interpres    120  120       
P1644Armeria rouyana    10000       
BA222Asio flammeus    10  20   
BA059Aythya ferina           
BA061Aythya fuligula           
BA243Calandrella brachydactyla          DD       
BA144Calidris alba    288  288       
BA149Calidris alpina    10299  10299   
BA466Calidris alpina schinzii          DD       
BA143Calidris canutus          DD       
BA143Calidris canutus    80  80           
BA147Calidris ferruginea          DD       
BA145Calidris minuta    120  120       
BA138Charadrius alexandrinus          DD 
BA138Charadrius alexandrinus    508  508   
BA136Charadrius dubius          DD       
BA137Charadrius hiaticula    1156  1156   
BA031Ciconia ciconia    100  110   
BA031Ciconia ciconia    194  400   
BA081Circus aeruginosus    15  15   
BA081Circus aeruginosus    12  14   
BA208Columba palumbus    500000  1000000   
BA113Coturnix coturnix          DD       
BA026Egretta garzetta    251  251       
BA026Egretta garzetta    500  600       
BA322Ficedula hypoleuca          DD       
BA153Gallinago gallinago    110  110       
BA135Glareola pratincola    20  20     
P1462Herniaria maritima    1001  10000   
BA131Himantopus himantopus    150  750   
BA131Himantopus himantopus    268  268   
BA300Hippolais polyglotta          DD       
BA251Hirundo rustica          DD       
BA251Hirundo rustica          DD       
BA022Ixobrychus minutus          DD       
P1487Jonopsidium acaule    10000       
BA341Lanius senator          DD       
BA184Larus argentatus          DD       
BA184Larus argentatus          DD       
BA183Larus fuscus          DD       
BA183Larus fuscus          DD       
BA176Larus melanocephalus          DD       
BA179Larus ridibundus          DD       
P1639Limonium lanceolatum    501  1000   
BA157Limosa lapponica    488  488   
BA156Limosa limosa    2535  2535   
P1719Linaria ficalhoana    1001  10000   
BA292Locustella luscinioides          DD       
BA271Luscinia megarhynchos          DD       
BA271Luscinia megarhynchos          DD       
M1355Lutra lutra          DD 
R1221Mauremys leprosa          DD 
P1556Melilotus segetalis ssp. fallax    101  250   
BA069Mergus serrator    79  79   
BA230Merops apiaster          DD       
M1338Microtus cabrerae          DD       
BA262Motacilla alba          DD       
BA260Motacilla flava          DD       
BA260Motacilla flava          DD       
BA319Muscicapa striata          DD       
P1669Myosotis lusitanica    501  1000   
P1673Myosotis retusifolia    101  250   
BA160Numenius arquata    859  859   
BA158Numenius phaeopus    259  259   
BA277Oenanthe oenanthe          DD       
BA094Pandion haliaetus     
BA017Phalacrocorax carbo    1432  1432   
BA151Philomachus pugnax          DD       
BA151Philomachus pugnax    15  15       
BA035Phoenicopterus ruber    607  607   
BA316Phylloscopus trochilus          DD       
BA034Platalea leucorodia    88  90       
BA034Platalea leucorodia    389  389       
BA140Pluvialis apricaria                 
BA141Pluvialis squatarola    1616  1616   
BA008Podiceps nigricollis    74  74       
BA124Porphyrio porphyrio     
BA132Recurvirostra avosetta    1924  1924   
BA132Recurvirostra avosetta           
BA336Remiz pendulinus          DD       
BA249Riparia riparia          DD       
BA249Riparia riparia          DD       
P1777Santolina impressa    10000       
BA195Sterna albifrons    57  70   
BA193Sterna hirundo          DD       
BA191Sterna sandvicensis    25  25       
BA351Sturnus vulgaris          DD       
BA310Sylvia borin          DD       
BA309Sylvia communis          DD       
BA302Sylvia undata          DD       
BA048Tadorna tadorna    28  28       
P1618Thorella verticillatinundata    251  500   
P1695Thymus camphoratus    51  100   
P1681Thymus carnosus    10000       
BA161Tringa erythropus         
BA164Tringa nebularia    92  92       
BA165Tringa ochropus    11  11       
BA162Tringa totanus           
BA162Tringa totanus    1495  1495   
BA285Turdus philomelos          DD       
M1349Tursiops truncatus    11  50   
BA142Vanellus vanellus    421  421           
  • Group: A = Amphibians, B = Birds, F = Fish, I = Invertebrates, M = Mammals, P = Plants, R = Reptiles
  • S: in case that the data on species are sensitive and therefore have to be blocked for any public access enter: yes
  • NP: in case that a species is no longer present in the site enter: x (optional)
  • Type: p = permanent, r = reproducing, c = concentration, w = wintering (for plant and non-migratory species use permanent)
  • Unit: i = individuals, p = pairs or other units according to the Standard list of population units and codes in accordance with Article 12 and 17 reporting (see reference portal)
  • Abundance categories (Cat.): C = common, R = rare, V = very rare, P = present - to fill if data are deficient (DD) or in addition to population size information
  • Data quality: G = 'Good' (e.g. based on surveys); M = 'Moderate' (e.g. based on partial data with some extrapolation); P = 'Poor' (e.g. rough estimation); VP = 'Very poor' (use this category only, if not even a rough estimation of the population size can be made, in this case the fields for population size can remain empty, but the field "Abundance categories" has to be filled in)

3.3 Other important species of flora and fauna (optional)


Population in the site


Group CODE Scientific Name S NP Size Unit Cat. Species Annex Other categories
     MinMax C|R|V|PIVVABCD
1272Chalcides bedriagai                 
1327Eptesicus serotinus                 
1359Herpestes ichneumon               
2004Lacerta lepida                   
1314Myotis daubentonii                 
1331Nyctalus leisleri               
2016Pipistrellus kuhlii                 
1309Pipistrellus pipistrellus                 
5009Pipistrellus pygmaeus                 
1329Plecotus austriacus                 
1333Tadarida teniotis               
A048Tadorna tadorna                 
  • Group: A = Amphibians, B = Birds, F = Fish, Fu = Fungi, I = Invertebrates, L = Lichens, M = Mammals, P = Plants, R = Reptiles
  • CODE: for Birds, Annex IV and V species the code as provided in the reference portal should be used in addition to the scientific name
  • S: in case that the data on species are sensitive and therefore have to be blocked for any public access enter: yes
  • NP: in case that a species is no longer present in the site enter: x (optional)
  • Unit: i = individuals, p = pairs or other units according to the standard list of population units and codes in accordance with Article 12 and 17 reporting, (see reference portal)
  • Cat.: Abundance categories: C = common, R = rare, V = very rare, P = present
  • Motivation categories: IV, V: Annex Species (Habitats Directive), A: National Red List data; B: Endemics; C: International Conventions; D: other reasons


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4.1 General site character

Habitat class % Cover

Total Habitat Cover


Other Site Characteristics

Zona húmida de importância internacional, com uma notável diversidade paisagística, em boa medida suportada por actividades agro-silvo-pastoris de baixa intensidade.

4.2 Quality and importance

Ocorrem grandes números de aves nidificantes com estatuto de ameaça, como por exemplo garça-vermelha (Ardea purpurea), perna-longa (Himantopus himantopus), tartaranhão-ruivo-dos-pauis (Circus aeruginosus), andorinha-do-mar-anã (Sterna albifrons). A área destaca-se ainda como local de passagem ou invernada para o alfaiate (Recurvirostra avosetta) e o flamingoPhoenicopterus ruber).

4.3 Threats, pressures and activities with impacts on the site

The most important impacts and activities with high effect on the site

Negative Impacts
RankThreats and pressures [code]Pollution (optional) [code]inside/outside [i|o|b]
Positive Impacts
RankActivities, management [code]Pollution (optional) [code]inside/outside [i|o|b]

Rank: H = high, M = medium, L = low
Pollution: N = Nitrogen input, P = Phosphor/Phosphate input, A = Acid input/acidification,
T = toxic inorganic chemicals, O = toxic organic chemicals, X = Mixed pollutions
i = inside, o = outside, b = both

4.5 Documentation

Costa, L.T. & R.S. Guedes. 1996. Contagens de anatídeos invernantes em Portugal Continental. Invernos de 1993/94 a 1995/96. ICN, Lisboa. Farinha, J.C. & A. Trindade. 1994. Contribuição para o inventário e caracterização de Zonas Húmidas em Portugal Continental. MedWet/ICN, Lisboa. Costa, L.T., M. Nunes, P. Geraldes, H. Costa 2003. Zonas Importantes para a Conservação das Aves em Portugal. SPEA. Farinha, J.C., L. Costa, A. Trindade, P.R. Araújo & E.P. Silva 2001. Zonas Húmidas Portuguesas de Importância Internacional. Instituto da Conservação da Natureza, Lisboa. Pacheco, C., P.K. McGregor , in press. Conservation of the purple gallinule (Porphyrio porphyrio L.) in Portugal: causes of decline, recovery and expansion. Biological conservation. Rosa G, D. Leitão, C. Mendes, F. Courinha, H. Costa, C. Pacheco & J. Pereira 2001b. Situação da Águia-sapeira Circus aeroginosus em Portugal: recenseamento da população invernante (1998/99). Airo 11: 23-27.


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5.1 Designation types at national and regional level:

Code Cover [%]

5.2 Relation of the described site with other sites:

Designated at national or regional level:

Type code Site name Type Cover [%]
PT07Reserva Natural do Estuário do Sado*87.00

Designated at international level:

Type Site name Type Cover [%]
ramsarEstuário do Sado*92.00


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6.1 Body(ies) responsible for the site management:

Organisation:Instituto da Conservação da Natureza e das Florestas, I.P.

6.2 Management Plan(s):

An actual management plan does exist:

No, but in preparation



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