Orientation of swimming flagellates by simultaneously acting external factors

Kessler, J.O., Hill, N.A. and Hader, D.-P. (1992) Orientation of swimming flagellates by simultaneously acting external factors. Journal of Phycology, 28(6), pp. 816-822. (doi: 10.1111/j.0022-3646.1992.00816.x)

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Publisher's URL: http://dx.doi.org/10.1111/j.0022-3646.1992.00816.x


The directionality of phototaxis combined with gravitaxis was investigated experimentally for populations of the swimming alga Euglena gracilis Klebs. Two irradiances were used: a “weak” irradiance to elicit positive phototaxis and a “strong” irradiance to elicit negative phototaxis. In addition, by changing the density of cells in the suspension, the number of collisions between cells was varied to determine the effects of these collisions on the distribution of swimming directions in both the absence and the presence of illumination. We found that positive phototaxis was associated with a broader distribution of swimming directions than was negative phototaxis. In the latter case, the effect of phototaxis dominated over that of gravitaxis. Experiments on another swimming alga, Chlamydomonas nivalis Wille, showed that collisions between cells degraded the directionality of gravitaxis.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hill, Professor Nicholas
Authors: Kessler, J.O., Hill, N.A., and Hader, D.-P.
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Journal Name:Journal of Phycology
ISSN (Online):1529-8817

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