Abstract
According to various investigations and occasional observations (Trembley, 1744; Wilson, 1891; Haase-Eichler, 1931; Haug, 1933; Singer et al., 1963; Passano and McCullough, 1965; Tardent and Frei, 1969) the freshwater Hydra perceives photic stimuli and reacts to them. The reaction-patterns to sudden light-intensity changes consist of extensions and/or contractions of the body and the tentacles or of phototactically motivated locomotory activities oriented to or from a permanent light source.
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References
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Tardent, P., Frei, E., Borner, M. (1976). The Reactions of Hydra Attenuata Pall. to Various Photic Stimuli. In: Mackie, G.O. (eds) Coelenterate Ecology and Behavior. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9724-4_69
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DOI: https://doi.org/10.1007/978-1-4757-9724-4_69
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