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Nitrate uptake and growth of Chaetoceros sp. in large outdoor continuous cultures 1
Author(s) -
Malone T. C.,
Garside C.,
Haines K. C.,
Roels O. A.
Publication year - 1975
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1975.20.1.0009
Subject(s) - dilution , nitrate , diel vertical migration , nutrient , nitrogen , growth rate , zoology , photoperiodism , lemna gibba , botany , biology , environmental chemistry , chemistry , ecology , aquatic plant , physics , geometry , mathematics , organic chemistry , macrophyte , thermodynamics
Diel variations in the growth and nutrient uptake rates of Chaetoceros sp. were observed in 2,000‐liter outdoor continuous cultures. Nitrate uptake was continuous and independent of the light‐dark cycle at dilution rates of 1.5 day −1 and less. At a dilution rate of 2.0 day 1 , nitrate uptake and net cellular organic nitrogen production varied in synchrony, peaking early in the photoperiod and decreasing to a did minimum during the dark period. Growth appeared to be limited by nitrate uptake at the slower dilution rates and by the rate at which nitrogen could be incorporated into new protoplasm at the highest dilution rate. The latter was probably light limited.