A Study on the Bacterial Flora Isolated from Marine Algae

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Abstract
Strains (58) of aerobic, heterotrophic bacteria were isolated from the green algae Ulva lactuca, Chaetomorpha brachygona and Codium cylindricum; the brown algae Sargassum hemiphyllum and Ectocarpus siliculosus, and the red algae Polysiphonia lanosa and Hypnea charoides. These strains were assigned to 7 genera including Pseudomonas, Vibrio, Alteromonas, Xanthomonas, Achromobacter, Flavobacterium and Micrococcus on the basis of extensive morphological, physiological and nutritional characterization. Strains of Micrococcus and Achromobacter appeared to be the dominant flora associated with the green algae. The yellow and orange-pigmented strains of Flavobacterium and Xanthomonas, and strains of Alteromonas were the major flora from the brown algae. The dominant bacterial flora from the red algae seemed to be intermediate between those associated with the green and the brown algae, with strains representing all the assigned bacterial genera. The bacterial flora associated with the marine algae was different from that isolated from seawater. Relatively specific bacterial flora apparently associated with different groups (phylum level) of marine algae growing in the same habitat.