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In the Paranapanema River mouth, Jurumirim Reservoir (23°27'-23°29'S and 48°39'-48°36'W, SP, Brazil), the biomass of E. polystachya was monthly determined with eight quadrats of 0.25 m² from August 1993 to July 1994. The seasonal variation in biomass was unimodal, with greater biomass from November 1993 to April 1994. The average biomass was 1,933.7 ± 479.5 gDW.m-2, with a variation along the year from 1,149.0 to 2,755.9 gDW.m-2. The annual variation of aerial green biomass, aerial and aquaticdoi:10.1590/s0034-71082001000100004 fatcat:udqzhmylu5azdojtlnougeihfu