Evaluación del estado trófico y comparación de modelos relativos al fósforo en los embalses de Cernadilla y Valparaíso (río Tera, Zamora)

Abstract

TROPHIC STATE EVALUATION AND COMPARISON OF MODELS RELATED TO PHOSPHORUS IN CERNADlLLA AND VALPARAISO RESERVOIRS (TERA RIVER, ZAMORA)Cernadilla (1965) and Valparaíso (1988) reservoirs, located in the river Tera which is a tributary within the Duero basin (Zamora), are used to produce electric energy and provide irrigation. The trophic state of the headwater reservoir (Cernadilla) has became worse since Valparaíso construction. In 1991, the interna1 phosphorus loading was 120,97 mg TP.m summer in Cernadilla, and 30,92 mg TP.m2 summer in Valparaíso. These estimates were calculated from the increased mass of hypolimnetic phosphorus divided by the surface area of the reservoir. The rates of phosphorus release from anoxic sediment surfaces were 14,40 and 6,2 mg TP.m2 d ', in Cernadilla and Valparaíso respectively. Both reservoirs were classified as mesotrophic in 1991.

Dynamic Modeling of the Trophic Status of an Urban Tropical Wetland under ENSO Conditions

“…This runoff volume was subsequently discharged from the wetland, becoming an outflow, which possibly allowed the improvement of its trophic status. Fraile [55] reported that, during the months of higher precipitation, the TP concentrations within a wetland tended to decrease, which was attributed to the self-purification of the aquatic system, promoted by the hydraulic renewal that evacuated the TP from it. Indeed, this trend favored the trophic recovery of wetlands.…”

Distribución espacio-temporal de cianobacterias planctónicas y factores ambientales asociados a sus proliferaciones en el embalse Cerrón Grande, El Salvador

“…A nivel ecológico, la presencia de cianobacterias en ecosistemas acuáticos no representa un peligro per se; sin embargo, bajo condiciones ambientales favorables de disponibilidad de luz solar, temperatura, pH (Chorus & Welker, 2021) y enriquecimiento del agua con nutrientes provenientes de actividades antrópicas, estos organismos pueden alcanzar altas densidades celulares aumentando el grado de eutrofia del sistema (Fraile et al, 1995;González et al, 2003;Vásquez et al, 2006). Por otro lado, algunas especies de cianobacterias tienen la capacidad de producir toxinas; a nivel mundial diversos autores han documentados incidentes de intoxicación relacionados a floraciones de cianobacterias lo que consecuentemente puede llegar a representar un problema de salud pública (Betancourt et al, 2009;Cunha et al, 2013;Lamparelli, 2004;Santiago & Vignatti, 2009;Vasconcelos, 2006).…”