Abstract
ABSTRACTThe distribution of 14C among photosynthetic end‐products was examined in eastern Canadian arctic phytoplankton, with particular emphasis on the synthesis of lipids. The pattern of 14C distribution for phytoplankton at each of three depths was generally similar among populations from 12 stations. About 18% of the total 14C fixed was incorporated into lipids. At one station, phytoplankton were experimentally subjected to temperature and light conditions different from those in situ: lipid‐14C did not exceed 30% of total 14C fixed within the temperature range ‐1.0 to 6.0° C and irradiance range 1 to 700 W · m−2. It is suggested that low temperatures and low light intensities, even when, maintained for prolonged periods, are not fully sufficient conditions for eliciting high relative rates of 14C incorporation into lipids. It is possible that differences in species composition may be a factor accounting for different patterns of 14C distribution between north and south polar phytoplankton under apparently similar environmental conditions.
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