1 Evaluación de posibles biomarcadores del estrés oxidativo en Egeria densa presente en el río Gascón, Santiago de Cuba Evaluation of potential biomarkers of oxidative stress in Egeria densa at Gascón river, Santiago de Cuba Evaluación de posibles biomarcadores del estrés oxidativo en Egeria densa presente en el río Gascón, Santiago de Cuba Evaluation of potential biomarkers of oxidative stress in Egeria densa at Gascón river, Santiago de Cuba Guisado-Bourzac F*, Menéndez-Sánchez J*, Falcón-Martin TA*, Moreno-Guisado JC* y JR Rodríguez-Amado** *Facultad de Ciencias Naturales y Exactas, Universidad de Oriente. Ave. Patricio Lumumba s/n, Alturas de Quintero, Santiago de Cuba, CP 90500, Cuba. [email protected] Tel: [email protected] **Laboratório de Pesquisa em Fármacos. Universidade Federal do Amapá. Brasil. [email protected] Tel: 55 96 [email protected] *Corresponding author: Frenkel Guisado-Bourzac E-mail address: [email protected]@uo.edu.cu Palabras claves: estrés oxidativo, Egeria densa, bioindicador, biomonitoreo, contaminación Keywords: oxidative stress, Egeria densa, bioindicator, biomonitoring, pollution. Abstract: Environmental pollution generates oxidative stress in living organisms, a situation which induces formation of free radicals and other reactive oxygen species, and molecules that indicate cell damage and antioxidant activity in response to that stress. Egeria densa is a freshwater plant present at Gascón river, Santiago de Cuba city, exposed to water pollution. In this research non-enzymatic and enzymatic biomarkers of oxidative stress were evaluated on Egeria densa leaf samples on four sampling stations in order to study physiological response face of anthropogenic pollution. Results show a significant increase (p