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| Arcos, F.. |
| Durante la Tercera Expedición Ecuatoriana a la Antártida en enero-febrero de 1991, como parte de los estudios de evaluación del impacto ambiental, se ha iniciado un reconocimieno físico, químico y biológico de un cuerpo de agua dulce en Punta Fort Williams, Isla Greenwich, Shetland del Sur. Se escogió un lago formado en una depresión del terreno con aporte de tipo glacial, expuesto al viento por tres de sus lados, poca profundidad por lo que es bién oxigenado y existe disponibilidad de nutrientes por degradación de materia orgánica vegetal proveniente de los alrededores y acarreada por los vientos. El lago es oligotrófico, sin aporte significativo de excretas de aves y mamíferos. Del plancton estudiado se define que hay un importante componente... |
| Tipo: Journal Contribution |
Palavras-chave: Biochemistry; Biological surveys; Fresh water; Inland water environment; Freshwater ecology; Biochemistry; Freshwater ecology. |
| Ano: 1990 |
URL: http://hdl.handle.net/1834/3871 |
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| Piñeiro, Roberto. |
| An assessment of the environmental quality in western Gulf of Batabanó, southern coast of Pinar del Río province, Cuba and its relationship with the reduction of freshwater supply by rivers is presented. Main characteristics of natural factors are analyzed, such as river supply to the coast, water temperature, salinity, dissolved oxygen, turbidity, pH, nutrients and organic nitrogen coal in sediments. Besides, submarine vegetation and general conditions are also analyzed. River supply of water was estimated in 1860412,24 m3/day, value which is only 20 % of what it used to be, therefore salinity has increased (> 35 ‰).and dissolved oxygen concentrations are lower (2.8-5.5 mg/l). Ammonia concentration are very high (> 50.0 μg/l) as well as higher... |
| Tipo: Journal Contribution |
Palavras-chave: Freshwater ecology; Coastal zone; Environmental conditions; Freshwater ecology; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_3104; Http://aims.fao.org/aos/agrovoc/c_32980. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/2939 |
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