Reservoirs of the Peri-Pampean region
Casco, María A.; Mac Donagh, María E.
In this article we analyze the reservoirs of the Peri-Pampean region comprised in the arid western corridor, taking into account their biogeographic areas and the characteristics of their basins. Since many of these reservoirs are impacted by agriculture, tourism and effluents from industries and urban areas, they are typically meso-eutrophic and with low levels of dissolved oxygen in the hypolimnion during summer. The Río Tercero Reservoir receives an additional impact from the change in operation prescribed for the functioning of a nuclear power plant. This water body, located in the “El Espinal” region, is oligo-mesotrophic, and its plankton has varied in composition and biomass during the pre- and post-operational periods of the plant. In all the reservoirs here studied, blooms have been registered, most frequently and recurrently produced by Cyanobacteria (e. g., species of Dolichospermum and Microcystis), and have been associated with the presence of toxins in the reservoirs of San Luis and in the San Roque Reservoir of Córdoba. Ceratium hirundinella (Pyrrophyta), a species widely colonizing the Peri-Pampean region, was also associated with blooms. In many reservoirs of the area no studies have been performed at all, while in others the investigations have been scarce and motivated by specific objectives with the results usually being published in either private or classified reports.