Primary Production in the Antarctic Ocean

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Studies on primary production were made in the Antarctic Ocean, between 40°W and 100°E, during December 1961 to February 1962. At ten stations, chlorophyll-a and photosynthetic rate were determined for sample waters from surface as well as the depth of Secchi disk reading, and at other 35 stations only chlorophyll-a in surface water was determined. At most of the stations the chlorophyll-a contents were very low (i.e. 0.02 to 0.22 mg/m3) except at a few stations where higher values, (i.e. 0.3-0.6 g/m3) were obtained. The photosynthetic rates determined by 14C technique under the optimum light ranged from 0.06 to 0.80 mg C/m3/ hr, and the mean value of photosynthesis per unit amount of chlorophyll was 1.22 mg C/mg chl./hr. The daily primary production beneath a unit surface, calculated from the above results and light data were ranged from 0.01 to 0.15 g C/m2/day. After consideration about the high concentration of nutrients in the sample waters and rather plenty incident radiation during this period, it was concluded that such low values of primary production in the Antarctic Ocean might be caused by the near freezing water temperature and deep mixing layer in that area.
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