Abstract
We examined the phototactic behaviour of individual amoebae of four Dictyostelium discoideum mutants which were altered in their slug phototaxis and thermotaxis. All four mutants were found to be also altered in amoebal phototaxis. This indicates that sensory processing in D. discoideum amoebae and slugs is not independent. The mutants were placed in three phenotypic classes. At suboptimal light intensities amoebal phototaxis is bidirectional, deviating right and left from the direction of incident light. Bimodality could be explained by assuming that spatial light gradients produced by internal absorption and scattering during phototaxis depend on the cell geometry in relation to the light direction.
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