This paper aims to set the record straight regarding the first observations of Corbicula fluminea (Müller, 1775) in the Guadiana 
River Basin. According to the available data, C. fluminea was first observed in 1988 and not in 2006 as suggested by Pérez-Bote 
and Fernandéz (2008). The first observations of C. fluminea in the Guadiana estuary were reported in 2000. In 2003, C. fluminea
was already well established in the estuary and in many rivers and streams. C. fluminea is likely to expand its current 
biogeographic distribution in Portugal, since suitable lentic habitats for colonization will be created by the implementation of the 
“National program of dams with high hydraulic potential”, which should be concluded by 2016

Chícharo, Luís

Morais, P.

Reis, J.

Teodosio, Maria

Teodósio, J.

Aquatic Invasions

Sapientia

 Aquatic Invasions (2009) Volume 4, Issue 4: 681-684 DOI  10.3391/ai.2009.4.4.14 © 2009 The Author(s) Journal compilation © 2009 REABIC (http://www.reabic.net) This is an Open Access article    681Short communication The Asian clam Corbicula fluminea (Müller, 1774) in the Guadiana River Basin (southwestern Iberian Peninsula): Setting the record straight Pedro Morais1,2*, Joaquim Teodósio3, Joaquim Reis4, Maria Alexandra Chícharo1,5 and Luís Chícharo1,5 1ICCE – Internat. Center for Coastal Ecohydrology, Palácio do Capitão-Mor, Horta das Figuras, EN125, 8005-518 Faro, Portugal 2CIMAR/CIIMAR – Centro Interdisciplinar de Investigação Marinha e Ambiental, Rua dos Bragas 289, 4050-123 Porto, Portugal 3SPEA – Sociedade Portuguesa para o Estudo das Aves, Avenida da Liberdade 105 2º Esq., 1250-140 Lisboa, Portugal 4Instituto Português de Malacologia, Zoomarine, EN 125, Km 65, Guia, 8200-864 Albufeira, Portugal 5CIMAR/CCMAR – Centro de Ciências do Mar, Faculdade de Ciências do Mar e do Ambiente, Campus de Gambelas, Universidade do Algarve, 8005-139 Faro, Portugal E-mail: pmorais@ualg.pt (PM), mchichar@ualg.pt (MAC), lchichar@ualg.pt (LC), joaquim.teodosio@spea.pt (JT), joaqreis@gmail.com (JR) *Corresponding author Received 20 March 2009; accepted in revised form 11 September 2009; published online 21 October 2009 Abstract This paper aims to set the record straight regarding the first observations of Corbicula fluminea (Müller, 1775) in the Guadiana River Basin. According to the available data, C. fluminea was first observed in 1988 and not in 2006 as suggested by Pérez-Bote and Fernandéz (2008). The first observations of C. fluminea in the Guadiana estuary were reported in 2000. In 2003, C. fluminea  was already well established in the estuary and in many rivers and streams. C. fluminea is likely to expand its current biogeographic distribution in Portugal, since suitable lentic habitats for colonization will be crea ted by the implementation of the “National program of dams with high hydraulic potential”, which should be concluded by 2016.  Key words: Corbicula fluminea, Guadiana River Basin, Guadiana estuary, dams, Portugal  The Asian clam Corbicula fluminea (Müller, 1774) is one of the 100 worst invasive species in Europe (DAISIE 2009). It was first noticed in the Iberian Peninsula in 1980, in the Tagus estuary (Mouthon 1981). Pérez-Bote and Fernández (2008) stated that C. fluminea was first recorded in the Guadiana River Basin (southwestern Iberian Peninsula, Figure 1) in June 2006, more precisely in the rivers Lacarón and Lobón and in the Montijo reservoir. However, Pérez-Quintero (1990) had already registered the presence of C. fluminea in Rivera Grande de la Golondrina (Lower Guadiana River basin) in 1988. In March 2000, the first observations of C. fluminea in the Guadiana estuary were registered in Guerreiros do Rio (37º23'52"N, 7º26'45"W), during a survey to identify the bivalves occurring along the first 40 kilometers of the estuary (Chícharo et al. 2000). More specimens of C. fluminea were collected from subtidal areas of the upper estuary (Figure 2), from Foz de Odeleite (station 3) to Alcoutim (station 8). In 2003, seventy seven sites were surveyed along the entire Portuguese Guadiana Basin and C. fluminea was present in 28.6% of these sites (Figure 2, Annex 1). The density of C. fluminea varied between 7 and 360 Captures Per Unit Effort (CPUE, as number of bivalves per researcher per hour of search), averaging 130 CPUE. In the Guadiana estuary, C. fluminea extended along 52 km of the estuary (Figure 2), from near Foz de Odeleite (station 3) to Mértola (station 16) (Figure 2). Another four species belonging to the family Unionidae were found, namely: Anodonta anatine (Linnaeus, 1758), Potomida littoralis (Cuvier, 1798), Unio delphi-nus Spengler, 1793 (replaces Unio pictorum (Linnaeus, 1758) in the Iberian Peninsula, see Barea-Azcon et al. 2008) and Unio tumidiformis Castro, 1895 (replaces Unio crassus Retzius, 1788) in the Iberian Peninsula (for these species see revised taxonomy in Reis and Araujo 2009). C. fluminea is currently known to be present in several tributaries of the River Guadiana and estuary,  namely in the following rivers: Alvacar,  P. Morais et al. 682   Figure 1. Geographical context of the Guadiana river basin in the Iberian Peninsula (Europe). Map modified from http://www.maps-for-free.com  Beliche, Carreiras, Cobres, Degebe, Foupana, Limas, Odeleite, Oeiras, Terges and Vascão and in Lake Mina de São Domingos (Reis 2006). In the river Guadiana, the distribution range of C. fluminea seems to have increased downstream of the Alqueva dam (Figure 1), since the closure of its gates in February 8th, 2002.  In Portugal, C. fluminea is also present in Minho, Lima, Douro, Vouga, Mondego, Lizandro, Tagus and Sado river basins (Reis 2006). The “national program of dams with high hydraulic potential” has the potential to cause a greater proliferation of C. fluminea in Portugal, increasing its biogeographic distribution and local abundances. Eleven new dams are sche-duled to be built under this program until 2016, so that non-used hydraulic potential decreases from 54% to 33% (Garcia 2009). This will certainly create suitable lentic habitats for colo-nization of C. fluminea (Pérez-Quintero 2008) and other non-indigenous freshwater aquatic species (Johnson et al. 2008). It is important to emphasize that the population dynamics of aquatic invasive species are better understood if the timing of introductions is known as accurately as possible. Moreover, biological invasions can only be eradicated if they are detected on time, but the best policy is still to prevent them. Thus, we urge for the creation of monitoring projects aiming both to evaluate the conservation status of native bivalves and to detect, as soon as possible, the introduction of non-native species.  Figure 2. Specific diversity of freshwater bivalves along the Portuguese Guadiana river basin in the summer of 2003 Acknowledgements The PhD and Post-Doc scholarships of Joaquim Reis (SFRH/BD/12687/2003), Joaquim Teodósio (SFRH/BD/8490/2002) and Pedro Morais (SFRH/BPD/40832/2007) were funded by Fundação para a Ciência e a Tecnologia. The PhD scholarship  of Joaquim Teodósio supported the 2003 survey. The English revision of the manuscript was made by our colleague Pedro Range.  Corbicula fluminea in the Guadiana River Basin  683 References Barea-Azcón J, Ballesteros-Duperón E, Moreno D (coords) (2008) Libro rojo de los invertebrados de Andalucia (4 tomos). Consejería de Medio Ambiente. Junta de Andalucia. Sevilla Chícharo L, Chícharo MA, Amaral A, Condinho S, Dias S, Morais P, Vaz Pinto G (2000) Valorização dos recursos pesqueiros do estuário do Guadiana. Relatório final do projecto ODIANA-VALPEG. Universidade do Algarve. Faro DAISIE (2009) Delivering alien invasive species inventories for Europe (DAISIE). http://www.europe-aliens.org  (Accessed 13 May 2009) Garcia R (2009) Bruxelas investiga programa de barragens. Público Online. http://www.publico.pt (Accessed 19 January 2009) Johnson, PTJ, Olden JD, Zanden MJV (2008) Dam invaders: impoundments facilitate biological invasions into freshwaters. Frontiers in Ecology and the Environment 6: 357-363, doi:10.1890/070156 Mouthon J (1981) Sur la présence en France et au Portugal de Corbicula (Bivalvia, Corbiculidae) originaire d´Asie. Basteria 45: 109-116 Pérez-Bote JL, Fernández J (2008) First record of the Asian clam Corbicula fluminea (Müller, 1774) in the Guadiana River Basin (southwestern Iberian Peninsula). Aquatic Invasions 3: 87-90, doi:10.3391/ai.2008.3.1.14 Pérez-Quintero JC (1990) Primeros datos sobre la presencia de Corbicula fluminea en España. I. Biometría. Scientia Gerundensis 16: 175-182 Pérez-Quintero JC (2008) Revision of the distribution of Corbicula fluminea (Müller, 1774) in the Iberian Peninsula. Aquatic Invasions 3: 355-358, doi:10.3391/ ai.2008.3.3.13 Reis J (2006) Atlas dos bivalves de água doce de Portugal Continental. ICN. Lisboa Reis J, Araujo R (2009) Redescription of Unio tumidiformis Castro, 1895 (Bivalvia, Unionidae), an endemism from the south-western Iberian Peninsula. Journal of Natural History 43: 1929-1245, doi:10.1080/00222930902993724     Annex 1. Location of sampling sites, in the lower Portuguese Guadiana river basin, surveyed in the summer of 2003 to collect freshwater bivalves. Legend for Station: numbers- locations with bivalves; capital letters - locations only with empty shells; lowercase letters - locations without bivalves  Station (map ref) Location Coordinates Recorded species Latitude, N Longitude, W C. fluminea A. anatina P. littoralis U. delphinus U. tumidiformis 1 Ribeira do Beliche 37°16'38" 7°30'24" +     2 Ribeira de Odeleite 37º20’04" 7°29'06" +     3 Estuário do Guadiana 37°19'39" 7°26'22" +     4 Ribeira da Foupana 37°23'04" 7°31'20" + +  +  5 Ribeira de Odeleite 37°19'56" 7°38'48"    + + 6 Ribeira da Foupana 37°24'17" 7°44'16"  +  + + 7 Ribeira do Vascão 37°23'48" 7°59'04"  + + + + 8 Estuário do Guadiana 37°28'12" 7°28'11" +     9 Estuário do Guadiana 37°31'30" 7°30'47" +     10 Estuário do Guadiana 37°32'57" 7°33'07" +  + +  11 Ribeira do Vascão 37°30'55" 7°34'54" + + + + + 12 Ribeira do Vascão 37°30'11" 7°40'40" + + + + + 13 Ribeira de Carreiras 37°32'47" 7°51'25"  +  +  14 Barragem da Tapada Grande 37°40'11" 7°30'19" +     15 Ribeira de Carreiras 37°36'37" 7°40'33"    +  16 Estuário do Guadiana 37°38'45" 7°39'06" + + + +  17 Ribeira de Carreiras 37°35'39" 7°45'26" + +  +  18 Ribeira de Oeiras 37°37'28" 7°48'18" + +  + + 19 Ribeira de Oeiras 37°38'30" 7°44'48" + +    20 Ribeira de Alvacar 37°39'37" 7°45'24" +   +  21 Ribeira de Alvacar 37°41'08" 7°49'04" + +  +  22 Ribeira de Limas 37°49'21" 7°37'21" + +  + + 23 Ribeira de Cobres 37°49'46" 7°51'48" + +  + + 24 Ribeira de Terges 37°50'34" 7°53'48"  +  +  25 Rio Chança 37°54'50" 7°15'55"    + + 26 Ribeira de Vidigão 37°53'37" 7°18'11"  + + + + 27 Rio Guadiana 37°58'50" 7°39'18"    +   P. Morais et al.   684 Annex 1 (continued)   Station (map ref) Location Coordinates Recorded species Latitude, N Longitude, W C. fluminea A. anatina P. littoralis U. delphinus U. tumidiformis 28 Ribeira de Cardeira 37°57'18" 7°41'14"    +  29 Ribeira do Murtigão 38°05'20" 7°05'51"    +  30 Ribeira de Safareja 38°03'51" 7°10'51"  +  +  31 Ribeira de São Pedro 38°03'30" 7°15'54"  +  + + 32 Rio Ardila 38°08'54" 7°17'38"    +  33 Rio Guadiana 38°09'26" 7°30'24"    +  34 Ribeira do Barranco do Panasco 38°05'06" 7°32'54"   +  + 35 Rio Guadiana 38°06'47" 7°37'32" +   +  36 Ribeira de Marmelar 38°09'32" 7°38'48"    + + 37 Barragem de Alqueva 38°21'45" 7°23'39" +  + +  38 Rio Degebe 38°26'37" 7°40'50" +     39 Ribeira da Azambuja 38°25'23" 7°42'55"  + + + + 40 Ribeira de Lucefece 38°35'53" 7°20'49"  +  + + 41 Ribeira da Pardiela 38°32'48" 7°41'07"    +  42 Rio Guadiana 38°43'45" 7°14'55" +   +  43 Rio Guadiana 38°46'13" 7°11'19"    +  44 Ribeira do Xévora 39°01'48" 6°57'34"    +  45 Ribeira do Xévora 39°03'11" 6°59'35"  + + +  46 Ribeira do Xévora 39°04'49" 7°01'05"  + + + + 47 Barragem do Caia 39°03'03" 7°13'43"  +  + + A Ribeira de Oeiras 37°28'33" 8°01'31"      B Ribeira de Cobres 37°41'27" 8°00'55"      C Rio Chança 37°45'12" 7°25'19"      D Ribeira de Limas 37°52'38" 7°32'14"      E Ribeira de Toutalga 38°03'56" 7°15'48"      F Ribeira de Odearce 38°05'59" 7°40'58"      G Ribeira de Vale de Vasco 38°32'15" 7°36'50"      H Rio Guadiana 38°44'20" 7°14'07"      I Ribeira de Abrilongo 39°05'31" 7°02'58"      J Ribeira de Arronches 39°08'01" 7°16'38"      a Ribeira do Beliche 37°18'01" 7°32'23"      b Ribeira de Odeleite 37°17'59" 7°44'51"      c Ribeira da Foupana 37°24'51" 7°37'47"      d Ribeira da Lampreia 37°34'28" 7°43'07"      e Rio Chança 37°42'03" 7°26'21"      f Ribeira dos Alcaides 37°43'50" 7°27'37"      g Ribeira de Cobres 37°39'07" 8°01'40"      h Ribeira da Maria Delgada 37°41'33" 8°01'45"      i Ribeira da Cinceira 37°47'40" 8°03'17"      j Ribeira de Terges 37°51'31" 7°57'15"      k Ribeira de Grafanes 37°59'38" 7°36'32"      l Ribeira de Murtéga 38°09'25" 6°59'51"      m Ribeira de Santo Aleixo 38°05'06" 7°09'32"      n Ribeira do Azevel 38°30'05" 7°25'48"      o Rio Degebe 38°30'42" 7°42'38"      p Ribeira de Lucefece 38°40'30" 7°28'52"      q Rio Guadiana 38°43'03" 7°16'32"      r Ribeira de Mures 38°44'49" 7°14'12"      s Rio Caia 38°52'24" 7°02'12"      t Rio Caia 39°07'04" 7°17'07"        

The Asian clam Corbicula fluminea (Müller, 1774) in the Guadiana River Basin (southwestern Iberian Peninsula): setting the record strait

Universidade do Algarve

 Aquatic Invasions (2009) Volume 4, Issue 4: 681-684 
DOI  10.3391/ai.2009.4.4.14 
© 2009 The Author(s) 
Journal compilation © 2009 REABIC (http://www.reabic.net) 
This is an Open Access article 
 
 
 681
Short communication 
The Asian clam Corbicula fluminea (Müller, 1774) in the Guadiana River Basin 
(southwestern Iberian Peninsula): Setting the record straight 
Pedro Morais1,2*, Joaquim Teodósio3, Joaquim Reis4, Maria Alexandra Chícharo1,5 and Luís Chícharo1,5 
1ICCE – Internat. Center for Coastal Ecohydrology, Palácio do Capitão-Mor, Horta das Figuras, EN125, 8005-518 Faro, Portugal 
2CIMAR/CIIMAR – Centro Interdisciplinar de Investigação Marinha e Ambiental, Rua dos Bragas 289, 4050-123 Porto, Portugal 
3SPEA – Sociedade Portuguesa para o Estudo das Aves, Avenida da Liberdade 105 2º Esq., 1250-140 Lisboa, Portugal 
4Instituto Português de Malacologia, Zoomarine, EN 125, Km 65, Guia, 8200-864 Albufeira, Portugal 
5CIMAR/CCMAR – Centro de Ciências do Mar, Faculdade de Ciências do Mar e do Ambiente, Campus de Gambelas, Universidade 
do Algarve, 8005-139 Faro, Portugal 
E-mail: pmorais@ualg.pt (PM), mchichar@ualg.pt (MAC), lchichar@ualg.pt (LC), joaquim.teodosio@spea.pt (JT), 
joaqreis@gmail.com (JR) 
*Corresponding author 
Received 20 March 2009; accepted in revised form 11 September 2009; published online 21 October 2009 
Abstract 
This paper aims to set the record straight regarding the first observations of Corbicula fluminea (Müller, 1775) in the Guadiana 
River Basin. According to the available data, C. fluminea was first observed in 1988 and not in 2006 as suggested by Pérez-Bote 
and Fernandéz (2008). The first observations of C. fluminea in the Guadiana estuary were reported in 2000. In 2003, C. fluminea  
was already well established in the estuary and in many rivers and streams. C. fluminea is likely to expand its current 
biogeographic distribution in Portugal, since suitable lentic habitats for colonization will be crea ted by the implementation of the 
“National program of dams with high hydraulic potential”, which should be concluded by 2016. 
 
Key words: Corbicula fluminea, Guadiana River Basin, Guadiana estuary, dams, Portugal 
 
The Asian clam Corbicula fluminea (Müller, 
1774) is one of the 100 worst invasive species in 
Europe (DAISIE 2009). It was first noticed in 
the Iberian Peninsula in 1980, in the Tagus 
estuary (Mouthon 1981). Pérez-Bote and 
Fernández (2008) stated that C. fluminea was 
first recorded in the Guadiana River Basin 
(southwestern Iberian Peninsula, Figure 1) in 
June 2006, more precisely in the rivers Lacarón 
and Lobón and in the Montijo reservoir. 
However, Pérez-Quintero (1990) had already 
registered the presence of C. fluminea in Rivera 
Grande de la Golondrina (Lower Guadiana River 
basin) in 1988. In March 2000, the first 
observations of C. fluminea in the Guadiana 
estuary were registered in Guerreiros do Rio 
(37º23'52"N, 7º26'45"W), during a survey to 
identify the bivalves occurring along the first 40 
kilometers of the estuary (Chícharo et al. 2000). 
More specimens of C. fluminea were collected 
from subtidal areas of the upper estuary (Figure 
2), from Foz de Odeleite (station 3) to Alcoutim 
(station 8). 
In 2003, seventy seven sites were surveyed 
along the entire Portuguese Guadiana Basin and 
C. fluminea was present in 28.6% of these sites 
(Figure 2, Annex 1). The density of C. fluminea 
varied between 7 and 360 Captures Per Unit 
Effort (CPUE, as number of bivalves per 
researcher per hour of search), averaging 130 
CPUE. In the Guadiana estuary, C. fluminea 
extended along 52 km of the estuary (Figure 2), 
from near Foz de Odeleite (station 3) to Mértola 
(station 16) (Figure 2). Another four species 
belonging to the family Unionidae were found, 
namely: Anodonta anatine (Linnaeus, 1758), 
Potomida littoralis (Cuvier, 1798), Unio delphi-
nus Spengler, 1793 (replaces Unio pictorum 
(Linnaeus, 1758) in the Iberian Peninsula, see 
Barea-Azcon et al. 2008) and Unio tumidiformis 
Castro, 1895 (replaces Unio crassus Retzius, 
1788) in the Iberian Peninsula (for these species 
see revised taxonomy in Reis and Araujo 2009). 
C. fluminea is currently known to be present 
in several tributaries of the River Guadiana and 
estuary,  namely in the following rivers: Alvacar, 
 
P. Morais et al. 
682 
 
 
Figure 1. Geographical context of the Guadiana river basin in 
the Iberian Peninsula (Europe). Map modified from 
http://www.maps-for-free.com  
Beliche, Carreiras, Cobres, Degebe, Foupana, 
Limas, Odeleite, Oeiras, Terges and Vascão and 
in Lake Mina de São Domingos (Reis 2006). In 
the river Guadiana, the distribution range of 
C. fluminea seems to have increased downstream 
of the Alqueva dam (Figure 1), since the closure 
of its gates in February 8th, 2002.  
In Portugal, C. fluminea is also present in 
Minho, Lima, Douro, Vouga, Mondego, 
Lizandro, Tagus and Sado river basins (Reis 
2006). The “national program of dams with high 
hydraulic potential” has the potential to cause a 
greater proliferation of C. fluminea in Portugal, 
increasing its biogeographic distribution and 
local abundances. Eleven new dams are sche-
duled to be built under this program until 2016, 
so that non-used hydraulic potential decreases 
from 54% to 33% (Garcia 2009). This will 
certainly create suitable lentic habitats for colo-
nization of C. fluminea (Pérez-Quintero 2008) 
and other non-indigenous freshwater aquatic 
species (Johnson et al. 2008). It is important to 
emphasize that the population dynamics of 
aquatic invasive species are better understood if 
the timing of introductions is known as 
accurately as possible. Moreover, biological 
invasions can only be eradicated if they are 
detected on time, but the best policy is still to 
prevent them. Thus, we urge for the creation of 
monitoring projects aiming both to evaluate the 
conservation status of native bivalves and to 
detect, as soon as possible, the introduction of 
non-native species. 
 
Figure 2. Specific diversity of freshwater bivalves along the 
Portuguese Guadiana river basin in the summer of 2003 
Acknowledgements 
The PhD and Post-Doc scholarships of Joaquim 
Reis (SFRH/BD/12687/2003), Joaquim Teodósio 
(SFRH/BD/8490/2002) and Pedro Morais 
(SFRH/BPD/40832/2007) were funded by 
Fundação para a Ciência e a Tecnologia. The 
PhD scholarship  of Joaquim Teodósio supported 
the 2003 survey. The English revision of the 
manuscript was made by our colleague Pedro 
Range. 
 
Corbicula fluminea in the Guadiana River Basin 
 
683 
References 
Barea-Azcón J, Ballesteros-Duperón E, Moreno D (coords) 
(2008) Libro rojo de los invertebrados de Andalucia (4 
tomos). Consejería de Medio Ambiente. Junta de 
Andalucia. Sevilla 
Chícharo L, Chícharo MA, Amaral A, Condinho S, Dias S, 
Morais P, Vaz Pinto G (2000) Valorização dos recursos 
pesqueiros do estuário do Guadiana. Relatório final do 
projecto ODIANA-VALPEG. Universidade do Algarve. 
Faro 
DAISIE (2009) Delivering alien invasive species inventories 
for Europe (DAISIE). http://www.europe-aliens.org  
(Accessed 13 May 2009) 
Garcia R (2009) Bruxelas investiga programa de barragens. 
Público Online. http://www.publico.pt (Accessed 19 
January 2009) 
Johnson, PTJ, Olden JD, Zanden MJV (2008) Dam invaders: 
impoundments facilitate biological invasions into 
freshwaters. Frontiers in Ecology and the Environment 
6: 357-363, doi:10.1890/070156 
Mouthon J (1981) Sur la présence en France et au Portugal de 
Corbicula (Bivalvia, Corbiculidae) originaire d´Asie. 
Basteria 45: 109-116 
Pérez-Bote JL, Fernández J (2008) First record of the Asian 
clam Corbicula fluminea (Müller, 1774) in the Guadiana 
River Basin (southwestern Iberian Peninsula). Aquatic 
Invasions 3: 87-90, doi:10.3391/ai.2008.3.1.14 
Pérez-Quintero JC (1990) Primeros datos sobre la presencia 
de Corbicula fluminea en España. I. Biometría. Scientia 
Gerundensis 16: 175-182 
Pérez-Quintero JC (2008) Revision of the distribution of 
Corbicula fluminea (Müller, 1774) in the Iberian 
Peninsula. Aquatic Invasions 3: 355-358, doi:10.3391/ 
ai.2008.3.3.13 
Reis J (2006) Atlas dos bivalves de água doce de Portugal 
Continental. ICN. Lisboa 
Reis J, Araujo R (2009) Redescription of Unio tumidiformis 
Castro, 1895 (Bivalvia, Unionidae), an endemism from 
the south-western Iberian Peninsula. Journal of Natural 
History 43: 1929-1245, doi:10.1080/00222930902993724 
 
 
 
 
Annex 1. Location of sampling sites, in the lower Portuguese Guadiana river basin, surveyed in the summer of 2003 to 
collect freshwater bivalves. Legend for Station: numbers- locations with bivalves; capital letters - locations only with empty 
shells; lowercase letters - locations without bivalves 
 
Station 
(map 
ref) 
Location 
Coordinates Recorded species 
Latitude, N Longitude, W 
C
. f
lu
m
in
ea
 
A
. a
na
ti
na
 
P
. l
it
to
ra
li
s 
U
. d
el
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in
us
 
U
. t
um
id
if
or
m
is
 
1 Ribeira do Beliche 37°16'38" 7°30'24" +     
2 Ribeira de Odeleite 37º20’04" 7°29'06" +     
3 Estuário do Guadiana 37°19'39" 7°26'22" +     
4 Ribeira da Foupana 37°23'04" 7°31'20" + +  +  
5 Ribeira de Odeleite 37°19'56" 7°38'48"    + + 
6 Ribeira da Foupana 37°24'17" 7°44'16"  +  + + 
7 Ribeira do Vascão 37°23'48" 7°59'04"  + + + + 
8 Estuário do Guadiana 37°28'12" 7°28'11" +     
9 Estuário do Guadiana 37°31'30" 7°30'47" +     
10 Estuário do Guadiana 37°32'57" 7°33'07" +  + +  
11 Ribeira do Vascão 37°30'55" 7°34'54" + + + + + 
12 Ribeira do Vascão 37°30'11" 7°40'40" + + + + + 
13 Ribeira de Carreiras 37°32'47" 7°51'25"  +  +  
14 Barragem da Tapada Grande 37°40'11" 7°30'19" +     
15 Ribeira de Carreiras 37°36'37" 7°40'33"    +  
16 Estuário do Guadiana 37°38'45" 7°39'06" + + + +  
17 Ribeira de Carreiras 37°35'39" 7°45'26" + +  +  
18 Ribeira de Oeiras 37°37'28" 7°48'18" + +  + + 
19 Ribeira de Oeiras 37°38'30" 7°44'48" + +    
20 Ribeira de Alvacar 37°39'37" 7°45'24" +   +  
21 Ribeira de Alvacar 37°41'08" 7°49'04" + +  +  
22 Ribeira de Limas 37°49'21" 7°37'21" + +  + + 
23 Ribeira de Cobres 37°49'46" 7°51'48" + +  + + 
24 Ribeira de Terges 37°50'34" 7°53'48"  +  +  
25 Rio Chança 37°54'50" 7°15'55"    + + 
26 Ribeira de Vidigão 37°53'37" 7°18'11"  + + + + 
27 Rio Guadiana 37°58'50" 7°39'18"    +  
 
P. Morais et al. 
 
 
684 
Annex 1 (continued)  
 
Station 
(map 
ref) 
Location 
Coordinates Recorded species 
Latitude, N Longitude, W 
C
. f
lu
m
in
ea
 
A
. a
na
ti
na
 
P
. l
it
to
ra
li
s 
U
. d
el
ph
in
us
 
U
. t
um
id
if
or
m
is
 
28 Ribeira de Cardeira 37°57'18" 7°41'14"    +  
29 Ribeira do Murtigão 38°05'20" 7°05'51"    +  
30 Ribeira de Safareja 38°03'51" 7°10'51"  +  +  
31 Ribeira de São Pedro 38°03'30" 7°15'54"  +  + + 
32 Rio Ardila 38°08'54" 7°17'38"    +  
33 Rio Guadiana 38°09'26" 7°30'24"    +  
34 Ribeira do Barranco do Panasco 38°05'06" 7°32'54"   +  + 
35 Rio Guadiana 38°06'47" 7°37'32" +   +  
36 Ribeira de Marmelar 38°09'32" 7°38'48"    + + 
37 Barragem de Alqueva 38°21'45" 7°23'39" +  + +  
38 Rio Degebe 38°26'37" 7°40'50" +     
39 Ribeira da Azambuja 38°25'23" 7°42'55"  + + + + 
40 Ribeira de Lucefece 38°35'53" 7°20'49"  +  + + 
41 Ribeira da Pardiela 38°32'48" 7°41'07"    +  
42 Rio Guadiana 38°43'45" 7°14'55" +   +  
43 Rio Guadiana 38°46'13" 7°11'19"    +  
44 Ribeira do Xévora 39°01'48" 6°57'34"    +  
45 Ribeira do Xévora 39°03'11" 6°59'35"  + + +  
46 Ribeira do Xévora 39°04'49" 7°01'05"  + + + + 
47 Barragem do Caia 39°03'03" 7°13'43"  +  + + 
A Ribeira de Oeiras 37°28'33" 8°01'31"      
B Ribeira de Cobres 37°41'27" 8°00'55"      
C Rio Chança 37°45'12" 7°25'19"      
D Ribeira de Limas 37°52'38" 7°32'14"      
E Ribeira de Toutalga 38°03'56" 7°15'48"      
F Ribeira de Odearce 38°05'59" 7°40'58"      
G Ribeira de Vale de Vasco 38°32'15" 7°36'50"      
H Rio Guadiana 38°44'20" 7°14'07"      
I Ribeira de Abrilongo 39°05'31" 7°02'58"      
J Ribeira de Arronches 39°08'01" 7°16'38"      
a Ribeira do Beliche 37°18'01" 7°32'23"      
b Ribeira de Odeleite 37°17'59" 7°44'51"      
c Ribeira da Foupana 37°24'51" 7°37'47"      
d Ribeira da Lampreia 37°34'28" 7°43'07"      
e Rio Chança 37°42'03" 7°26'21"      
f Ribeira dos Alcaides 37°43'50" 7°27'37"      
g Ribeira de Cobres 37°39'07" 8°01'40"      
h Ribeira da Maria Delgada 37°41'33" 8°01'45"      
i Ribeira da Cinceira 37°47'40" 8°03'17"      
j Ribeira de Terges 37°51'31" 7°57'15"      
k Ribeira de Grafanes 37°59'38" 7°36'32"      
l Ribeira de Murtéga 38°09'25" 6°59'51"      
m Ribeira de Santo Aleixo 38°05'06" 7°09'32"      
n Ribeira do Azevel 38°30'05" 7°25'48"      
o Rio Degebe 38°30'42" 7°42'38"      
p Ribeira de Lucefece 38°40'30" 7°28'52"      
q Rio Guadiana 38°43'03" 7°16'32"      
r Ribeira de Mures 38°44'49" 7°14'12"      
s Rio Caia 38°52'24" 7°02'12"      
t Rio Caia 39°07'04" 7°17'07"      
 
 


https://sapientia.ualg.pt/bitstream/10400.1/5140/1/14.pdf

The Asian clam Corbicula fluminea (Müller, 1774) in the Guadiana River Basin (southwestern Iberian Peninsula): setting the record strait

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Universidade do Algarve