Dinámica del fitoplancton en un embalse de alta cota del Noroeste Argentino (Tucumán)
In 2000 limnological studies were conducted in La Angostura Dam and at the estuaries of its tributaries, at 1980 m a.s.l. in Tucumán province (Argentina). In this paper the results about the physical and chemical characteristics of the dam, the trophic state and the composition and dynamics of the p...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2009 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | español |
| OAI Identifier: | oai:ddd.uab.cat:40140 |
| Acceso en línea: | https://ddd.uab.cat/record/40140 |
| Access Level: | acceso abierto |
| Palabra clave: | Fitoplàncton Estat tròfic Embassament de muntanya Fitoplancton Variables físico-químicas Estado trófico Embalse de montaña Phytoplankton Physical-chemical variables Trophic level Mountain dam |
| Sumario: | In 2000 limnological studies were conducted in La Angostura Dam and at the estuaries of its tributaries, at 1980 m a.s.l. in Tucumán province (Argentina). In this paper the results about the physical and chemical characteristics of the dam, the trophic state and the composition and dynamics of the phytoplankton community, related to the abiotic variables are presented. Due to the thermal behavior of the dam, La Angostura would classify as a warm monomictic type and the water was characterized as: HCO-3 > SO=4 > Cl-; Ca2+ > Na+ > K+ > Mg2+. A total of 66 algae taxa were recorded, with an average abundance ranging from 179 ind/ml to 2.122 ind/ml. Because it is subtropical lake located in a mountain area, La Angostura did not correspond with a defined trophic category. Due to a decrease in diversity at higher abundance, high pH, high phytoplanktonic biomass fluctuations, and readings lower than 0.005 and 0.5 mg/l for nitrite and nitrate respectively, the dam would classify as eutrophic; and due to the α chlorophyll, dissolved oxygen, oxygen biochemical demand, and ammonium, it would classify as an oligo-mesotrophic type body of water. The results obtained from the multivariate analysis allowed to confirm that the phytoplankton composition was firstly determined by the temperature, which controlled the physical mixture of the water column, and which additionally was affected by strong winds. Secondly, the phytoplankton composition depended upon the hydrological cycle, as this was the parameter that was most influential on the water transparency. Lastly, the different trophic indicators also affected on the phyto $p lankton dynamic. |
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