, Volume 29, Issue 1–2, pp 140–148 | Cite as

A preliminary study of vertical movement of Eudorina elegans and trinema lineare during a bloom caused by them

  • M. Munawar
  • A. R. Zafar


The paper describes a polluted pond from India, which exhibited a well marked thermal stratification in summer. The surface and bottom strata of water exhibited a temperature difference of 8° C. The paper also describes the diurnal movement of Eudorina elegans and Trinema lineare which formed a bloom in the pond. The movements of these organisms are interpreted on the basis of fluctuations in temperature and light conditions. The possibility of the competition for space is also discussed.


On a décrit un cas de stratification thermale bien marquée dans un étang pollué en dépit de peu de profondeur de son bassin, dans un été en Inde. Les couches superficielles et de fond de l'eau ont montré une différence de temperature de 8° C. On décrit également le mouvement diurnal d'Eudorina elegans et Trinema lineare qui ont formé une floraison dans l'étang. Le déplacement de ces organismes est interprété en fonction du changement de temperature et de la luminosité. La possibilité d'une concurrence pour l'espace est discutée.


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Copyright information

© Dr. W. Junk Publishers 1967

Authors and Affiliations

  • M. Munawar
  • A. R. Zafar
    • 1
  1. 1.Hydrobiological Laboratory, Department of BotanyOsmania UniversityHyderabad-7 (A.P.)India

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