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Orientation of the green flagellate euglena gracilis in a vertical column of water

Orientation of the green flagellate euglena gracilis in a vertical column of water

FEMS Microbiology Ecology 53(3-4): 159-168

The orientation of the green flagellate, Euglena gracilis, in a vertical column immersed in a pond was studied using automatic cell counting based on computerized image analysis. When exposed to solar radiation, the population moved downward in the column, probably guided by negative phototaxis, and formed a dense layer at the bottom. It is suggested that this behavior provides an opportunity for the organisms to escape from detrimental bright light. The downward movement is faster than the swimming speed of the cells allows and could be accelerated by a fluid mechanic effect. The upward movement observed at night may be due to the precise negative gravitaxis observed in the organisms. These antagonistic types of behavior allow the organisms to actively search for and to stay in areas with suitable conditions.

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Accession: 006044425

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DOI: 10.1111/j.1574-6968.1988.tb02660.x

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