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Journal Article

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)

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Saint-Paul,  Ulrich
Working Group Tropical Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Citation

Jedicke, A., Schlüter, U.-B., Saint-Paul, U., & Schlüter, U.-B. (1989). 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). Amazoniana: Limnologia et Oecologia Regionalis Systematis Fluminis Amazonas, 11(1), 53-69.


Cite as: https://hdl.handle.net/21.11116/0000-0004-8589-B
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
Pistia stratiotes, under nearly anaerobic conditions. The physiological analyses were supplemented by
anatomical investigations. A measurable oxygen input from both plants was detected: that from E.
crassipes was 116 mg O2 * h-1 * m-2, and from P. stratiotes, 58 mg O2 * h-1 * m-2. Water surface area representing 4 kg and 2.9 kg fresh weight, respectively. The O2 input from E. crassipes seemed to be
independent of the amount of photosynthesis, suggesting that a pressure ventilation was responsible
for the input. In the case of P. stratiotes, a relationship was found between the photosynthetic activity
and the O2 input. The significance of this input for the Neotropical ecosystem and the fish fauna is
discussed.