Phytoplankton from NE Doñana marshland ("El Cangrejo Grande", Doñana Natural Park, Spain)
The study area ("El Cangrejo Grande", Doñana Natural Park) is located at the final section of the Guadiamar River channel and it is a part of the NE Doñana marshland. The hydrological characteristics of the area are complex and dynamic due to the different origin of its water input: the Gu...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2007 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:27981 |
| Acceso en línea: | https://ddd.uab.cat/record/27981 |
| Access Level: | acceso abierto |
| Palabra clave: | Fitoplancton Doñana Aiguamoll Pantà Marisma Segregación temporal Humedal Phytoplankton Marshland Temporal segregation Wetlands |
| Sumario: | The study area ("El Cangrejo Grande", Doñana Natural Park) is located at the final section of the Guadiamar River channel and it is a part of the NE Doñana marshland. The hydrological characteristics of the area are complex and dynamic due to the different origin of its water input: the Guadiamar River basin, the Guadalquivir River estuary, and rice paddies outlets. This area is included in the hydrologic regeneration plan for the Doñana marshland ("Doñana 2005"), though the present study was finished before any modification took place. Phytoplankton richness was high since a total of 224 phytoplankton taxa were registered. Diatoms and Clorophytes were the groups that had the highest richness, Nitzschia palea, Cyclotella atomus and Monoraphidium contortum being the most widely distributed and abundant species. Phytoplankton exhibited a strong seasonal variation, in both composition and biomass, segregated in two periods (flood and desiccation) as suggested by the results of the PCA. On the other hand, the spatial differences were less evident according to a multidimensional scaling analysis (MDS). This seasonal pattern was stronger in the ordination of physico-chemical variables (conductivity, nutrient concentration and suspended matter).We conclude that this system is an ecotone zone with a high hydrologic complexity due to a variety of water inputs with a strong seasonality. These hydrologic features would be the determining factor in phytoplankton composition and high taxon richness. |
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