The effects of continuous light and intensity on the reproduction rates of 22 species of marine phyto plankton

Brand, L.E.; Guillard, R.R.L.

Journal of Experimental Marine Biology and Ecology 50(2-3): 119-132


ISSN/ISBN: 0022-0981
Accession: 006662116

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The acclimated reproduction rates of 22 spp. of marine phytoplankton (including diatoms, dinoflagellates, coccolithophores and blue-green algae) were measured at 0.01, 0.023, 0.1 and 0.23 ly(langleys) per min in continuous light and in a 14:10 h light:dark cycle (LD). Three species that reproduced exponentially at all 4 light intensities in the 14:10 LD regime did not reproduce at all in continuous light at any of the light intensities. One species, which reproduced at the 2 lowest light intensities in the 14:10 LD regime, failed to reproduce at all in continuous light at any light intensity examined. Seven species reproduced more slowly in continuous light than in the 14:10 LD regime at most or all light intensities. Four species reproduced at roughly the same rate in both light regimes. Five species reproduced more rapidly in continuous light. No general phylogenetic trend could be discerned from the responses of the species to the different light intensities or to continuous light. In general, species from coastal regions can reproduce as rapidly or more rapidly in continuous light in a 14:10 LD cycle, while most species from oceanic regions are harmed by continuous light. A phylogenetic trend in maximum potential reproduction rate is apparent, with diatoms being the fastest, dinoflagellates the slowest, and coccolithophores somewhat intermediate.