Effect of inorganic phosphorus on the growth rate of diatoms

The effect is studied of different inorganic phosphorus concs on changes in growth rates of 7 diatom spp isolated from the plankton of the Black Sea. All spp examined increase their cell-division rate with increasing phosphorus conc in the medium. The phosphorus concs have been determined above whic...

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Bibliographic Details
Published in:Marine biology 1974-08, Vol.26 (3), p.193-201
Main Authors: Finenko, Z. Z., Krupatkina-Akinina, D. K.
Format: Article
Language:English
Subjects:
Cerataulina
Chaetoceras
Chrysophyceae
Coscinodiscus
Ditylum
Skeletonema
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Summary:The effect is studied of different inorganic phosphorus concs on changes in growth rates of 7 diatom spp isolated from the plankton of the Black Sea. All spp examined increase their cell-division rate with increasing phosphorus conc in the medium. The phosphorus concs have been determined above which division rate is not limited by phosphorus content in the medium. The non-limiting conc amounts to V/V Sub(m) = 0.9. In the spp studied, non-limiting concs ranged from 1 to 30 {mu}g P/1. The highest values were obtained for relatively large-sized spp. The ratio of cell surface to volume tended to be inversely related to the growth-rate-limiting conc. Minimal values of phosphorus content in cells have been calculated to range from 0.6 to 4.0 x 10 Super(-17)g. at-P/{mu} Super(-3). Based on a comparison of phosphate levels in the Black Sea with experimentally ¨C derived rate-limiting concs, it is concluded that phosphorus does not limit the reproduction rate of phytoplankton in the more productive regions of the Black Sea or in the lower strata of the euphotic zone.
ISSN:0025-3162
1432-1793
DOI:10.1007/BF00389251