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KINETICS OF SILICON‐LIMITED GROWTH IN THE MARINE DIATOM THALASSIOSIRA PSEUDONANA HASLE AND HEIMDAL (= CYCLOTELLA NANA HUSTEDT) 1, 2
Author(s) -
Guillard Robert R. L.,
Kilham Peter,
Jackson Togwell A.
Publication year - 1973
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.1529-8817.1973.tb04086.x
Subject(s) - thalassiosira pseudonana , biology , diatom , saturation (graph theory) , growth rate , botany , silicon , clone (java method) , ecology , nutrient , phytoplankton , physics , biochemistry , geometry , mathematics , optoelectronics , combinatorics , dna
SUMMARY The half‐saturation constant ( K 8 ) for growth and the maximum growth rate (μ max ) were determined for 2 clones of Thalassiosira pseudonana (=Cyclotella nana) under conditions in which external silicon concentrations controlled growth. The estuarine clone (3H) had a higher half‐saturation constant and maximum growth rate ( K 8 = 0.98 μM Si; μ max = 3.6 divisions/day) than the clone from the Sargasso Sea ( K 8 = 0.19 μM Si; μ max = 2.1 divisions/day). The K 8 values for each clone are such that the silicate levels found at certain times in both the Sargasso Sea and the coastal regions are rate limiting to growth, hence can be of significance to plant production and to species succession. The yield data are consistent with the concept that growth rate and cellular silicon content vary together in silicon‐limited cultures.