Abstract
Activity and numbers of heterotrophic bacteria have indicated that, as expected, Prévost Lagoon is more eutrophic than Arcachon Bay. Amplification and sequence analysis of the 16S rRNA genes from DNA samples extracted directly from the environment allow the determination of phylogenetic relationships among members of microbial communities in natural ecosystems without the need for cultivation. Analysis of partial 16S rRNA gene sequences obtained from Stations A and 11 revealed that, in both environments, a relatively large number of clones related to Cytophaga/Flexibacter/Bacteroides as well as to α-Proteobacteria were found. One hundred percent similarity with the sequences of the data bases were not found for any of the more than a hundred clones studied. In fact for most clones maximum similarity was below 95% for the nucleotide series sequenced. Similarity was not higher with any of the sequences found for the 14 isolates (pure cultures) obtained from the same samples. Redundancy, i.e. number of identical sequences, was higher in the samples from Arcachon. In addition, sequences related to representatives of ten major phylogenetic branches of Eubacteria were obtained from Prévost Lagoon, however only five branches were represented by the data from Arcachon. These findings indicate a higher bacterial diversity in Prévost Lagoon.
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Benlloch, S., Rodríguez-Valera, F., Acinas, S.G., Martínez-Murcia, A.J. (1996). Heterotrophic bacteria, activity and bacterial diversity in two coastal lagoons as detected by culture and 16S rRNA genes PCR amplification and partial sequencing. In: Caumette, P., Castel, J., Herbert, R. (eds) Coastal Lagoon Eutrophication and ANaerobic Processes (C.L.E.AN.). Developments in Hydrobiology, vol 117. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1744-6_1
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DOI: https://doi.org/10.1007/978-94-009-1744-6_1
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