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EFFECT OF THE SINKING RATE OF TWO DIATOMS ( THALASSIOSIRA SPP.) ON UPTAKE FROM LOW CONCENTRATIONS OF PHOSPHATE 1
Author(s) -
Canelli Edmondo,
Fuhs G. Wolfgang
Publication year - 1976
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.1529-8817.1976.tb02833.x
Subject(s) - thalassiosira pseudonana , biology , algae , phosphorus , phosphate , volumetric flow rate , botany , nutrient , ecology , biochemistry , phytoplankton , chemistry , physics , organic chemistry , quantum mechanics
SUMMARY The effect of the sinking rate, or rate of medium flow (φ) on the rate of phosphate incorporation (V) by the planktonic diatoms Thalassiosira fluviatilis Hust. and T. pseudonana Hasle & Heimdal in batch and chemostat cultures was determined by passing medium at defined flow rates (0.5–25.0 mm·min −1 ) over algae on membrane filters. At concentrations from 1 to 100 μg phosphorus·l −1 V, increases with increasing velocity of flow, approaching a maximum value (V m ) as described by the empirical relationship:where K φ is the sinking rate value when V = 1/2 V m + V o and V o is the uptake at 0 rate of flow. By comparing uptake at controlled flow with uptake in a vigorously stirred medium, the phosphate concentration in the cell boundary layer can be determined. The sinking rate that reduces the phosphate concentration in the boundary layer to half of nominal concentration in the medium is much lower for the larger T. fluviatilis than for T. pseudonana. For both diatoms, it is inversely related to the nominal concentration.