Limnological characterization of the water, algae and mud resources used in Copahue Thermal Complex (Neuquén, Argentina)
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.
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Asociación Argentina de Ecología
2021
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Flores Melo, Ximena de la Rosa, I. Nadia Baffico, Gustavo Temporetti, Pedro Wenzel, María T. Cabrera, Juan Pedrozo, Fernando Diaz, Mónica |
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Flores Melo, Ximena de la Rosa, I. Nadia Baffico, Gustavo Temporetti, Pedro Wenzel, María T. Cabrera, Juan Pedrozo, Fernando Diaz, Mónica Limnological characterization of the water, algae and mud resources used in Copahue Thermal Complex (Neuquén, Argentina) |
author_facet |
Flores Melo, Ximena de la Rosa, I. Nadia Baffico, Gustavo Temporetti, Pedro Wenzel, María T. Cabrera, Juan Pedrozo, Fernando Diaz, Mónica |
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Flores Melo, Ximena |
title |
Limnological characterization of the water, algae and mud resources used in Copahue Thermal Complex (Neuquén, Argentina) |
title_short |
Limnological characterization of the water, algae and mud resources used in Copahue Thermal Complex (Neuquén, Argentina) |
title_full |
Limnological characterization of the water, algae and mud resources used in Copahue Thermal Complex (Neuquén, Argentina) |
title_fullStr |
Limnological characterization of the water, algae and mud resources used in Copahue Thermal Complex (Neuquén, Argentina) |
title_full_unstemmed |
Limnological characterization of the water, algae and mud resources used in Copahue Thermal Complex (Neuquén, Argentina) |
title_sort |
limnological characterization of the water, algae and mud resources used in copahue thermal complex (neuquén, argentina) |
description |
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. |
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Asociación Argentina de Ecología |
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2021 |
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https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1231 |
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rev-ecoaus-article-12312023-11-02T16:41:01Z Limnological characterization of the water, algae and mud resources used in Copahue Thermal Complex (Neuquén, Argentina) Caracterización limnológica del agua, las algas y los barros utilizados en el Complejo Termal Copahue (Neuquén, Argentina) Flores Melo, Ximena de la Rosa, I. Nadia Baffico, Gustavo Temporetti, Pedro Wenzel, María T. Cabrera, Juan Pedrozo, Fernando Diaz, Mónica acidic algae thermal algae healing muds hot springs extreme environments algas acidófilas algas termales barros terapéuticos aguas termales ambientes extremos 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. Se realizó la caracterización físico-química de los ambientes extremos (aguas termales y barros) del Complejo Termal Copahue, y se aislaron y cultivaron algas empleadas con propósitos medicinales y terapéuticos. Se analizaron aspectos ecofisiológicos de las especies y sus respuestas fotosintéticas, así como la potencial toxicidad de los barros. En los 15 sitios muestreados (pH: 2.0-6.7, conductividad: 283-3230 µS/cm, temperatura: 22-60 °C) se identificaron 11 especies de cianobacterias de un total de 24 especies algales. La riqueza específica fue baja, con especies representativas de ambientes ácidos: Cyanidium caldarium, Euglena mutabilis, Chlamydomonas acidophila, Achnanthidium minutissimum y Eunotia exigua, y especies cosmopolitas de aguas termales: Mastigocladus laminosus, Leptolyngbia boryana y Phormidium tergestinum. Todas las especies mostraron estar bien adaptadas a bajas intensidades lumínicas (15-55 µmol fotones.m-2.s-1) y sus respuestas fotosintéticas resultaron comparables a las de ambientes similares. El pH y la temperatura fueron factores importantes en la distribución de las algas, y la alta relación N:P sugiere que el P es el nutriente limitante del crecimiento algal. Las fracciones que controlaron la disponibilidad de P en los sedimentos fueron las de materia orgánica y de oxihidróxidos de Fe/Al. Los barros terapéuticos mostraron capacidad para precipitar los metales y no serían tóxicos. El Cd y otros metales potencialmente tóxicos estuvieron presentes en muy bajas concentraciones y no representarían un riesgo para uso humano como barros curativos y baños. Asociación Argentina de Ecología 2021-08-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículos application/pdf application/pdf https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1231 10.25260/EA.21.31.3.0.1231 Ecología Austral; Vol. 31 No. 3 (2021): December 2021. Pages 390-574; 400-412 Ecología Austral; Vol. 31 Núm. 3 (2021): December 2021. Pages 390-574; 400-412 0327-5477 1667-7838 eng https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1231/1130 https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1231/1131 Derechos de autor 2021 Ximena Flores Melo, I. Nadia de la Rosa, Gustavo Baffico, Pedro Temporetti, María T. Wenzel, Juan Cabrera, Fernando Pedrozo, Mónica Diaz https://creativecommons.org/licenses/by/3.0/ |