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COMPARATIVE PHYSIOLOGICAL STUDY OF MARINE DIATOMS AND DINOFLAGELLATES IN RELATION TO IRRADIANCE AND CELL SIZE. I. GROWTH UNDER CONTINUOUS LIGHT 1, 2
Author(s) -
Chan Augustine T.
Publication year - 1978
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1978.tb02458.x
Subject(s) - biology , dinoflagellate , diatom , chaetoceros , botany , cell division , cell size , chlorophyll a , algae , cell , phytoplankton , ecology , biochemistry , microbiology and biotechnology , nutrient
Cell division rates and chlorophyll a and protein contents for ten diatom and dinoflagellate species were measured. Species were chosen to include a wide range of cell size in terms of both cell volume and cell protein: from 0.004 ng protein/cell for a small Chaetoceros sp. to 2.2 ng protein/cell for Prorocentrum micans Ehrenberg. Experiments were conducted in batch or semi‐continuous cultures at 21 C under continuous illumination from 8 –256 μ Ein . m ‐2 ' . s ‐1 . Light saturation of cell division occurred at 32–80 μEin m ‐1 s ‐1 for all species, with no observable difference between the two phylogenetic groups. When the light‐saturated cell division rates were plotted against cell size as protein/cell, the diatoms and dinoflagellates fell on two separate lines with the diatoms having higher rates. Chl a /protein ratios (μg/μg) decreased with increasing irradiance. The diatoms had higher chl a per unit protein. The relationship between cell division rate and the chl a /protein ratio is discussed .