Increase in the oxygen concentration in Amazon waters resulting from the root exudation of two notorious water plants, Eichhornia crassipes (Pontederiaceae) and Pistia stratiotes (Araceae)

Abstract

Qualitative and quantitative analyses were carried out to determine the amount of oxygen that enters the water through the root systems of two floating Neotropical plants, Eichhornia crassipes and Hstia stratiotes, under nearly anaerobic conditions. The physiological analyses were supplemented by anatomical investigations.