THE EFFECTS OF INCREASING LIGHT AND TEMPERATURE ON THE STRUCTURE OF DIATOM COMMUNITIES

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Abstract
The results of studies concerning the effects of artificially increasing temperature and naturally and artificially increasing day length are discussed. Naturally increasing day length was more favorable for community development than increasing clay length by artificial light. Increasing temperature is most beneficial when temperatures are near 0C. Moving away from the limits of tolerance at either end of the range produced the greatest changes in the structure of diatom communities. Intermediate changes near the optimum range produced less predictable results. One new variety of Gomphonema olivaceoides is described.

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