Simulation of Bioluminescence in Dinoflagellates by Controlled Pressure Changes.
NAVAL RESEARCH LAB WASHINGTON DC
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Bioluminescence in two species of dinoflagellates, Pyrocystis lunula and Gonyaulax polyedra, was stimulated when small pressure changes occured. At an initial pressure of 1 atm, a pressure decrease rate of 0.25 or - 0.04 atms was the mean decrease threshold for P. lunula. Small variations in this threshold occured at a higher initial pressure and at different times during the circadian cycle. Pressure decreases were much more effective than pressure increases. For G. polyedra, a pressure change rate of at least 0.95 atms was required to stimulate bioluminescence. Pressure increases and decreases were both effective, but decreases were more effective than increases. The variation in results did not lend itself to statistical analysis.
- Anatomy and Physiology