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Analysis of a population of magnetotactic bacteria of the Gulf of Gabès, Tunisia

Pradel, Nathalie, Cayol, Jean-Luc, Fardeau, Marie-Laure, Karray, Fatma, Sayadi, Sami, Alazard, Didier, Ollivier, Bernard
Environmental science and pollution research international 2016 v.23 no.5 pp. 4046-4053
alpha-Proteobacteria, bacteria, bioremediation, coasts, databases, heavy metals, microscopy, pollution, ribosomal DNA, ribosomal RNA, sequence analysis, Mediterranean Sea, Mediterranean region, Tunisia
The occurrence of magnetotactic bacteria (MTB) on a Tunisian marine coast exposed to heavy metals pollution (Sfax, Gulf of Gabès, Mediterranean Sea) was investigated. The MTB population of this Southern Mediterranean coast was compared to the MTB populations previously investigated on the French Northern Mediterranean coast. A dominant MTB coccus morphotype was observed by microscopy analysis. By pyrosequencing technology, the analysis of the 16S ribosomal RNA (rDNA) revealed as much as 33 operational taxonomic sequence units (OTUs) close to sequences of MTB accessible in the databases. The majority were close to MTB sequences of the “Med group” of α-Proteobacteria. Among them, a dominant OTU_001 (99 % of the MTB sequences) affiliated within the Magnetococcales order was highlighted. Investigating the capacities of this novel bacterium to be used in bioremediation and/or depollution processes could be envisaged.