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Behavioral Reactions of the Sea Anemone, Anthopleura xanthogrammica, to Ultraviolet and Visible Radiations
Ervil D. Clark and Donald J. Kimeldorf
Vol. 45, No. 1 (Jan., 1971), pp. 166-175
Published by: Radiation Research Society
Stable URL: http://www.jstor.org/stable/3573089
Page Count: 10
You can always find the topics here!Topics: Light, Wavelengths, Radiation dosage, Photoreceptors, Cavitation flow, Spectral sensitivity, Receptors, Ultraviolet radiation, Invertebrates, Pigments
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The sea anemone, Anthopleura xanthogrammica, exhibits prompt behavioral responses to electromagnetic radiation in the visible and ultraviolet ranges that can be separated into reactions having markedly different spectral dependence. Differences were disclosed by exposure to monochromatic radiations in the range 240-650 nm. Different wavelength ranges and maxima were observed for (1) tentacle flexion, (2) tentacle retraction, (3) oral disc flexion, (4) column cavitation, and (5) peristome depression. Tentacle flexion appears to be a response to specific photoreceptors in that the maximum efficiency for stimulation is in the same spectral region as for many forms with discrete photoreceptors. Tentacle retraction is considered to be a response to absorption of energy by proteins and nucleic acids, as evidenced by its maximum efficiency peak at 280 nm. Oral disc, column, and peristome responses involve regional muscle action, probably induced by deep photoreceptors rather than by nonspecific effects on cell proteins.
Radiation Research © 1971 Radiation Research Society