Influences of nine algal species isolated from duckweed-covered sewage miniponds on Lemna gibba L.

Sándor Szabó, Mihály Braun, Sándor Balázsy, Otto Reisinger

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Axenic Lemna gibba L. (duckweed) cultures grown on autoclaved communal wastewater were inoculated by nine algal species isolated from a minipond containing wastewater covered by duckweeds. After 10 days of incubation, the total chlorophyll content of the duckweed cultures were measured as an indicator of the physiological condition of duckweeds. With low (< 50%) duckweed cover, all of the nine algal species except Nitzchia palea and Anacystis nidulans significantly lowered the chlorophyll content of Lemna cultures. Algae reduced the chlorophyll content of duckweeds by 21-64%. With complete duckweed cover, the examined algal species did not significantly lower the chlorophyll content of the cultures. According to the result of the factorial experiment, we may state that Chlorella pyrenoidosa, Chlamydomonas ehrenbergii and Oscillatoria redekei reduce the chlorophyll content of L. gibba at low but not at high duckweed cover. However, we observed that interaction between C. pyrenoidosa-C. ehrenbergii, C. pyrenoidosa-O. redekei, C. ehrenbergii-O. redekei increased the chlorophyll content of Lemna cultures. Inhibitory influence of algal species was higher at high organic concentration of the nutrient solution. Under these condition and low duckweed cover, the presence of C. pyrenoidosa, O. redekei and Oscillatoria pseudogeminata was lethal to Lemna.

Original languageEnglish
Pages (from-to)189-195
Number of pages7
JournalAquatic Botany
Issue number2
Publication statusPublished - Feb 1 1998


  • Algae
  • Interaction
  • Lemna gibba
  • Wastewater

ASJC Scopus subject areas

  • Aquatic Science
  • Plant Science

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