Tendencias del fitoplancton en el lago de la Albufera de Valencia e implicaciones para su ecología, gestión y recuperación
The lake of Albufera de Valencia, with 2320 ha, is the largest shallow, oligohaline lake of the Spanish coast. It is located within the Natural Park of the Albufera de Valencia, which is mainly formed by rice fields. This important Spanish wetland is subjected to different environmental impacts. The...
| Autores: | , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2008 |
| País: | España |
| Recursos: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | español |
| OAI Identifier: | oai:ddd.uab.cat:27994 |
| Acesso em linha: | https://ddd.uab.cat/record/27994 |
| Access Level: | acceso abierto |
| Palavra-chave: | Cianobactèries Fitoplàncton Llac somer Mediterrani Coster Cianobacterias Fitoplancton Lago somero Mediterráneo Costero Cyanobacteria Phytoplankton Shallow lake Mediterranean Coastal |
| Resumo: | The lake of Albufera de Valencia, with 2320 ha, is the largest shallow, oligohaline lake of the Spanish coast. It is located within the Natural Park of the Albufera de Valencia, which is mainly formed by rice fields. This important Spanish wetland is subjected to different environmental impacts. The Albufera Lake has been eutrophic since the 1970s. Even though a diversion plan for nutrients entering the lake mainly from the north and northwest started in 1991, its effects on the system's quality have been limited. Since 1985, a continuous monitoring of the lake's phytoplankton has been carried out, which represents one the largest temporal data set for shallow Mediterranean lakes. In this study, phytoplankton trends in the lake of the Albufera de Valencia are analysed, as well as its implications for the ecology, management, restoration, and conservation of the lake and its surrounding related wetlands. A 30% nutrient diversion has not decreased the dominance of cyanobacteria in the lake's phytoplankton, although it has contributed to a change in species composition, with a trend to a decrease in filamentous cyanobacteria and an increase of chroococcal cyanobacteria. The filamentous cyanobacteria Planktothrix agardhii, has been a good indicator species of the nutrient enrichment periods in the lake. The hydrological cycle of the lake was closely related to the phytoplankton ecology and the lake food webs. The reduction of the lake water inputs has produced higher algal biomasses and the increase of algal species with adaptation strategies towards more stable water columns. The increase of Microcystis aeuroginosa and Cylindrospermopsis raciborski in the lake implies an additional risk due to their capacity to produce cyanotoxins. Data analysis leads us to conclude that the reduction in the external nutrient loading was insufficient to revert the lake's trophic state towards an improvement of its water quality, which nowadays can be classified as "bad" according to the European Water Framework Directive. Some measures are suggested in order to manage and improve the water quality of the Albufera de Valencia lake. |
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