Stoichiometry of nitrogen and carbon utilization in cultured populations of Trichodesmium IMS101: Implications for growth

摘要

Rates of particulate organic carbon (POC) and particulate organic nitrogen (PON) accumulation, N_2 and CO_2 fixation, and NH_4 uptake were measured in cultures of Tri - chodesmium IMS101 growing on an artificial culture medium without added N substrates. Cultures exhibited a doubling time of about 4 d based on the accumulation of PON, POC, chlo- rophyll a, and cell number. Cell-specific rates of N_2 and CO_2 fixation were highest during midday and during the initial stages of the growth cycle.