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The reactions of certain mysids to stimulation by light and gravity

Published online by Cambridge University Press:  11 May 2009

G. E. H. Foxon
Affiliation:
From the Departments of Zoology in the University of Glasgow, and University College, Cardiff; and the Marine Station, Millport

Extract

Light-adapted mysids as exemplified by Hemimysis lamornae display phototelotaxis which regularly alternates in sign from positive to negative and vice versa. This reaction may be disturbed by other activities such as feeding; it only takes place in horizontal illumination.

Dark-adapted mysids display negative geotaxis. When a light stimulus is given this geotaxis is reversed in sign irrespective of the direction of the incident light.

When the statocysts of the mysids are removed their responses are much more like those of planktonic creatures. In the light normal orientation is maintained by the “dorsal light reflex”, and in darkness by the “general position reflex”. In the darkness a feeble negative geotaxis is sometimes seen. In light, phototaxis is seen in both light-adapted and dark-adapted conditions; in the majority of cases it is negative but on occasion has been seen to be positive.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1940

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