The microflora of Eagle Island mangrove swamp, southern Nigeria
Abstract
The occurrence, abundance and distribution of bacteria (nitrifying, nitrogen-fixing and heterotrophic), yeasts, moulds, algae and actinomycetes in mangrove and freshwater swamps were studied. Microbial abundance and diversity were greater in freshwater than in mangrove swamps. Actinomycetes were the dominant organisms in sediments while algae occurred widely in water. A total of 57 microbial genera were isolated from the mangrove swamp, out of which the algae had greatest diversity comprising 20 genera. It was followed by the moulds, which had 16 genera, then bacteria (10 genera), yeast (6 genera) and actinomycetes (5 genera). The organisms were widely distributed in all parts of the swamp, though actinomycetes did not occur in the water samples and yeasts occurred sparsely in freshwater. The study implicates the genera Aeromonas, Proteus, Serratia and Citrobacter (bacteria); Thermoactinomyces and Streptomyces (actinomycetes); Aspergillus, Trichoderma, Penicillium, Mucor, Fusarium, Geotrichum, Verticillium and Botrytis (moulds); Rhodospiridium, Trigonopsis and Pichia (yeasts); Gomphonema, Fischerella, Asterionella, Borgea, Nostoc, Chlamydomonas, Laminaria, Spirulina, Chlorobotrys and Vaucheria (algae) as autochthonous members of the mangrove swamps of the Niger delta. Mangrove swamps therefore harbour a wide range of microorganisms some of which are indigenous to this slightly acidic habitat and occur in varying proportions.
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