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Effects of continuous light & light intensity on reproduction rates of marine phytoplankton

February 21st, 2007 | No Comments | Posted in Algae-Cultivation, Algae-Nutrients

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The effects of continuous light and light intensity on the reproduction rates of twenty-two species of marine phytoplankton

L. E. Brand and R. R. L. Guillard Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, U.S.A. Available online 1 April 2003.


The acclimated reproduction rates of 22 species of marine phytoplankton were measured at 0.01, 0.023, 0.1, and 0.23 ly/min in continuous light and in a 14: 10 h light: dark cycle. Three species that reproduced exponentially at all four 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 two 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 than 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.

Original Science Direct source page here

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