Lagoa da Fajã dos Cubres
| Lagoa da Fajã dos Cubres | ||
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| Geographical location | Calheta County , Sao Jorge , Azores , Portugal | |
| Data | ||
| Coordinates | 38 ° 38 '31.3 " N , 27 ° 57' 57.6" W | |
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| surface | 3.04 ha | |
| volume | 29,000 m³ | |
| Maximum depth | 2.6 m | |
| Middle deep | 0.95 m | |
Lagoa da Fajã dos Cubres is a lagoon on the Portuguese Azores island of São Jorge . It is located in the Calheta district on a 34- hectare coastal plain, the Fajã dos Cubres , which was given its current shape by a massive landslide in 1757 and subsequent erosion and human influences.
The lake was completely separated from the sea in a natural way by a 900 m long, 30 m wide and more than 4.3 m high scree barrier. However, there is a limited exchange of salt water, on the one hand due to the fact that sea water seeps through the barrier, which causes the height of the water level to fluctuate by 20 to 30 mm with the tides , and on the other hand, in storms, also across the barrier. In addition, the lake is fed by groundwater . The lagoon contains several islands, one of which divides the lake into two parts in connection with a dam built in 1951, which today have very different salinity . The inland eastern part contains brackish water with a salt content below 0.6%, while the water in the western part contains an average of 1.5% salt on the surface and 2.6% on the bottom.
The shores of the lagoon are almost everywhere difficult to access as they are surrounded by a belt of stinging rush . The water can only be reached in the east, where pastureland extends to the lake, at the beginning of the dam in the south and at the barrier in the north. The eastern part of the lake is also flat in its central part, the bottom covered by black, anoxic mud. Mats, which mainly consist of the green alga Enteromorpha intestinalis , float in the water . The pond frog also lives in this part of the water . In the western part, which is much deeper, there are mats of the green alga Codium effusum in the shallow water area . A wide belt of the Ruppia maritima beach balance extends directly below the lower tide line .
The lagoon is an important habitat for native resident birds such as the snowy plover , the teal , the mallard , the moorhen and the Caspian as well as for migratory birds such as the Sanderling , the gull , the black-headed gull , the black-tailed godwit , the little egret and the Whimbrel . Also, the Ruddy Turnstone , the rose tern , the common snipe , the gray heron , the great yellowshank , the greenshank and the coot have been observed here.
The lake is located in the Natura 2000 area PTJOR0014 ("Costa NE e Ponta do Topo - Ilha de S. Jorge") and in the Ramsar area 1615 ("Fajãs' of Caldeira and Cubres Lagoons").
western part
eastern part
View from the north of the dam that divides the lagoon
Web links
Individual evidence
- ↑ a b c d e f Information Sheet on RAMSAR Wetlands (RIS) (PDF; 176 kB). Secretaria Regional do Ambiente e do Mar, Horta 2005, accessed August 18, 2015.
- ^ A b c d Brian Morton, JC Britton, AM Frias Martins: Fajã dos Cubres, São Jorge: a case for coastal conservation and the first record of Ruppia maritima Linnaeus (Monocotyledones; Ruppiaceae) from the Açores ( Memento from March 7, 2016 in the Internet Archive ) (PDF; 1.17 MB). In: Açoreana . Volume 8, 1995, pp. 11-30.
- ↑ Rogério R. Ferraz, Vanessa Santos, Samanta Vizinho, Vera Guerreiro, Frederico Cardigos, Pedro Frade, Fernando Tempera, Ricardo S. Santos: Caracterização Ecológica e Sócio-Económica do Sítio de Importância Comunitária Costa Nordeste e Ponta do Topo (e PTJOR do Topo) Medidas de Gestão Propostas . In: Arquivos do DOP Série Estudos 20, 2004, pp. 1-57.
- ↑ , Fajãs' of Caldeira and Cubres Lagoons , Ramsar Sites Information Service, of 2006.