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- Title
EFFECTS OF LIGHT INTENSITY ON DIVISION RATE, STIMULABLE BIOLUMINESCENCE AND CELL SIZE OF THE OCEANIC DINOFLAGELLATES DISSODINIUM LUNULA, PYROCYSTIS FUSIFORMIS AND P. NOCTILUCA.
- Authors
Swift, Elijah; Meunier, Valerie
- Abstract
Preadapted cultures were grown in a 12:12 LD cycle at a series of light intensities under cool-white fluorescent lamps. Pyrocystis fusiformis Murray maintained high division rates at low light intensities at the expense of cell size. In contrast, Dissodinium lunula (Schuett) Taylor had relatively lower division rates at Iow light intensities with little concomitant decrease in size. The response of P. noctiluca Murray was intermediate between these two species. For all three, cell numbers did not increase above an intensity of 5-10 μEin·m[SUP-2]·sec[SUP-1] and division rate was saturated at ca. 30, 60, and 60ttEin. m[SUP-2]sec[SUP-1] for P. fusiformis, P. noctiluca, and D. lunula, respectively. The capacity for stimulable bioluminescence was saturated at light intensities of 0.15 μEin·m[SUP-2] day in short-term, (2-day) experiments. In cultures of P. fusiformis and P. noctihtca, mainrained for at least one month at lower intensities than needed to saturate division rate, a decrease in the capacity for stimulable bioluminescence was accompanied by a reduction in cell size. Our results suggest that cell size and bioluminescent capacity may prove to be a potentially useful indication of the history of exposure of natural populations of Pyrocystis spp. to ambient intensities.
- Subjects
CULTURES (Biology); DINOFLAGELLATES; FLUORESCENT lamps; NOCTILUCA; BIOLUMINESCENCE
- Publication
Journal of Phycology, 1976, Vol 12, Issue 1, p14
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1111/j.0022-3646.1976.00014.x