*2.2.3 El Salvador*

Wastewater effluents and similar runoffs with high nutrient concentrations derived from agricultural fertilizers, which are increased by the susceptibility to erosion, deforestation, and sediment trawling, have induced the eutrophication process and, consequently, produced the proliferation of *M. aeruginosa* (cyanobacteria) in the volcanic Lake Coatepeque [31].

The Cerrón Grande reservoir also suffered the eutrophication process, and its waters are classified as hypereutrophic. The dominant cyanobacteria species is *Microcystis* spp. [32].
