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Biol Bull 133: 150-165. (August 1967)
© 1967 Marine Biological Laboratory
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SHORT-TERM PHOTIC REGULATION OF A RECEPTOR MECHANISM IN A DINOFLAGELLATE

WILLIAM G. HAND 1, RICHARD FORWARD 1, and DEMOREST DAVENPORT 1

1 The University of California, Santa Barbara, Santa Barbara, Calif. 93106

1. The effect of blue light on the behavior of Gyrodinium dorsum is described. Action spectra for the orientation and "stop" responses are presented.

2. Dark-adaptation curves for the stop-response in darkness and red light are presented.

3. The maintenance effect of red light on these responses is described and a possible two-pigment machinery proposed.

4. The relationship of these phenomena to the vertical distribution of the phytoplankter in nature is discussed.




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Copyright © 1967 by the Marine Biological Laboratory.