Primary productivity and standing crops of phytoplankton in Belwood Reservoir

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Abstract
In experiments conducted simultaneously at two stations in Belwood Reservoir it was found that while the standing crop and the rate of assimilation per square meter were less at a station just below the inflow, the activity coefficient was generally higher than at a station near the dam. The activity coefficient varied from 0.19 with a population consisting mainly of Cryptomonas, Asterionella, and Dinobryon to 0.02 with a very large population of mainly Ceratium hirundinella. In general there was an inverse relationship between standing crop and activity coefficient. Daily production estimates ranged from 134 mg C/day m2 to 1650 mg C/day m2. A population of Peridinium aciculiferum was found to have an activity coefficient of 0.05.

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