BAFFICO gustavo Daniel
capítulos de libros
Extreme Freshwater Ecosystems in Patagonia: The Copahue-Agrio System
TEMPORETTI, P.F.; BAFFICO, G.; DIAZ, M.; BEAMUD, G.; NICHELA, D.; CABRERA, J.; PEDROZO, F.
Freshwaters and Wetlands of Patagonia
Año: 2022; p. 137 - 162
The chapter compiles 20 years of research work carried out in the River Agrio-Lake Caviahue system by the Water Quality and Aquatic Resources Research Group. This system is characterized by its natural gradient of acidity, as well as concentration and transport of nutrients and metals, which is expressed in low diversity of species, both in lake plankton and river epilithic communities. The replacement of algal species (seasonal succession) does not occur in the lake under low pH conditions (Avg. 2.5). The low pH allows most of the elements present to remain in solution, conditioning environments with a high content of metals and phosphorus in the Upper River Agrio section and Lake Caviahue. In recent years, the lake has experienced a significant increase of at least one pH unit, (a situation that is controlled by magmatic activity), causing changes in chemical composition. If the increase continues, it is expected to affect the epilithic and phytoplanktonic compositions. This fact is unprecedented for aquatic environments in Argentina. The chapter covers a) basic aspects such as water chemistry, nutrient loadings, trophic status, algal communities (phytoplankton and epilithic algae), the geochemistry of sediments and their role in metal and nutrient dynamics, and b) applied aspects such as the use of acidophilic algae as indicators of remediation processes of soils contaminated by hydrocarbons, the behaviour of a naturally acidic lake as a Fenton reactor, and the use of such environments as a potential sentinel for nutrient deposition in Patagonia.