Caracterización limnológica del agua, las algas y los barros utilizados en el Complejo Termal Copahue (Neuquén, Argentina)
| Autor: | Gustavo Baffico, Fernando Pedrozo, Ximena Flores Melo, Mónica M. Diaz, María Teresa Wenzel, Juan Manuel Cabrera, Pedro Temporetti, I. Nadia de la Rosa |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Cyanobacteria Cadmium Ecology biology chemistry.chemical_element Photosynthesis biology.organism_classification chemistry Algae Environmental chemistry Cosmopolitan distribution Extreme environment Organic matter Species richness Ecology Evolution Behavior and Systematics |
| Zdroj: | Ecología Austral. 31:400-412 |
| ISSN: | 0327-5477 |
| DOI: | 10.25260/ea.21.31.3.0.1231 |
| Popis: | We carried out the physicochemical characterization of extreme environments of acidic geothermal springs of the Copahue Thermal Complex, and isolated and cultivated algae used for therapeutic and medicinal purposes. Ecophysiological aspects, algal photosynthetic responses and potential toxicity of sediments were analysed. At the 15 sampling sites (pH: 2.0-6.7, conductivity: 283-3230 µS/cm, temperature: 22-60 °C), 11 Cyanobacteria species of a total of 24 algae were identified. The species richness was low with true inhabitants of highly acidic waters: Cyanidium caldarium, Euglena mutabilis, Chlamydomonas acidophila, Achnanthidium minutissimum, and Eunotia exigua, and cosmopolitan species of thermal springs: Mastigocladus laminosus, Leptolyngbia boryana and Phormidium tergestinum. All the species were well adapted to low light levels (15-55 µmol photon.m-2.s-1), and photosynthetic responses were similar to those in comparable environments. pH and temperature were important factors in algal distribution, and N:P relationship suggests that P is the limiting nutrient for algal growth. Fractions controlling P availability in the muds were those bound to organic matter, and Fe/Al oxyhydroxides. Healing muds have the ability to precipitate metals and would not be toxic. Cadmium and other potentially toxic metals were in very low concentrations and pose no risk for the human use as healing muds and bathing. |
| Databáze: | OpenAIRE |
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