MORPHOLOGICAL-CHANGES OF EUGLENOPHYTA IN RESPONSE TO ORGANIC ENRICHMENT

Euglena acus, Euglena spirogyra, Phacus curvicaudus, Phacus pyrum and Phacus tortus isolated from Matanza River, Buenos Aires, Argentina, we re grown in soil-water medium. When transferred to soil-water medium e nriched with different beef-extract concentrations, a marked cell defo rmation could be observed in every instance, owing either to an extrao rdinary accumulation of paramylon grains or to a great development of some of them. In this paper, these morphological changes are described and their ecological implications are discussed.