Theodore A. Ehlke 1974 <p>Bacteria and blue-green algae were isolated from Oneida Lake, N.Y., and other sources. The blue-green algae <i>Anabaena flos-aquae</i>, <i>Anabaena spiroides</i>, <i>Gloeotrichia echinulata</i>, and <i>Microcystis aeruginosa</i> were grown under laboratory conditions and were separated into unialgal cultures. The bacterial population living in association with the unialgal blue-green algae differed significantly from the bacterial flora of Oneida Lake. <i>Bacillus</i>, <i>Pseudomonas</i>, <i>Aeromonas</i>, and <i>Zoogloea</i> were the most frequently occurring genera of bacteria from the lake, whereas <i>Flavobacterium</i>, <i>Achromobacter</i>, and <i>Pseudomonas</i> were the most common bacteria isolated from laboratory blue-green cultures. Nutritional and physiological characteristics of bacteria isolated in the laboratory were more uniform than those isolated from the lake.</p> application/pdf en U.S. Geological Survey Comparison of bacterial and phytoplankton populations under natural and laboratory conditions article