Selective Isolation of Blue-green Algae from Water and Soil

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Abstract
For the isolation of blue-green algae from soil and fresh water, temperature is a selective factor of major importance. In a nutritionally nonselective mineral medium, which at 25[degree] supported growth of blue-green algae and of many eucaryotic algae, the development of eucaryotic algae was almost completely suppressed by incubation at 35\ Both the number and variety of blue-green algae recoverable at 35"were greater than those recoverable from parallel cultures incubated at 25C. When a combined-N source was omitted from the enrichment medium, only blue-green algae developed at both 25[image] and 35[image]; the microflora consisted exclusively of heterocyst-forming filamentous types, other groups of blue-green algae being eliminated.

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