pression (1) papier (1) écosystème aquatique (1) métal lourd (1) santé (1) eau douce (1) documentation (1) diatomées (1) contamination (1) Documentation (1) Causes (1) Forms (1) Abnormalities (1) Waste products (1) Walls (1) Silica (1) Scarcity (1) Pressure (1) Population (1) Percentage (1) Paper (1) Health (1) Growth (1) Fresh water (1) Environmental engineering (1) Documentation (1) Diatoms (1) Communities (1) Cells (1) Plants--Abnormalities (1)