SHORT-TERM PHOTIC REGULATION OF A RECEPTOR MECHANISM IN A DINOFLAGELLATE

Abstract
The effect of blue light on the behavior of Gyrodinium dorsum is described. Action spectra for the orientation and "stop" responses are presented. Dark-adaptation curves for the stop-response in darkness and red light are presented. The maintenance effect of red light on these responses is described and a possible 2-pigment machinery proposed. The relationship of these phenomena to the vertical distribution of the phyto-plankter in nature is discussed.