Studies on Bottom-Living Algae in Some Lakes of the English Lake District: IV. The Seasonal Cycles of the Bacillariophyceae

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Abstract
The changes in cell numbers of the diatoms living on bottom sediments in shallow water in some English lakes have been recorded over a period of 2 years. These changes have been correlated with the nutrient status of the waters over this period, particularly the SiO2 and NO3 values and with rainfall, sunlight, water level and temperature changes etc. Detailed graphs of the total cell counts of Pinnularia, Navicula and Nitzschia are given[long dash]these made up the bulk of the population. Spring and autumn growth ''peaks are recorded and compared with the plankton cycle of diatom growth.