Improving Water Quality by Control of Algae:Cellular and Extracellular Blue-Green Algal Polysaccharides.

摘要

Lakes in Iowa were surveyed for blue-green algal blooms each summer from 1972through 1975. Physicochemical and biological parameters of four lakes were measured each year during and following blue-green algal blooms of a single dominant species or two co-dominants in one case. One lake was studied for six months during periods of aeration and non-aeration. The ultrastructure of the life cycle of Aphanizomenon flos-aquae was followed in nature and in culture. The influence of strains of Anabaena cylindrica, Anacystic nidulans,and Nostoc muscorum on the pH and buffer capacity of culture media was observed. During periods of dense algal blooms,lake water was collected and processed for isolation of water-soluble organic material which was found to be polysaccharide. Studies were initiated on the relationship between blue-green algal bloom species and aquatic bacteria associated with them,particularly concerning the role of algal polysaccharides.