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Early steps in microbial colonization processes at deep-sea hydrothermal vents.

TitreEarly steps in microbial colonization processes at deep-sea hydrothermal vents.
Type de publicationJournal Article
Year of Publication2004
AuteursAlain, K, Zbinden, M, Le Bris, N, Lesongeur, F, Quérellou, J, Gaill, F, Cambon-Bonavita, M-A
JournalEnviron Microbiol
Volume6
Ticket3
Pagination227-41
Date Published2004 Mar
ISSN1462-2912
Mots-clésAnimals, Archaea, Bacterial Adhesion, Cluster Analysis, DNA, Bacterial, DNA, Ribosomal, Ecosystem, Epsilonproteobacteria, Marine Biology, Molecular Sequence Data, Phylogeny, Polychaeta, RNA, Ribosomal, 16S, Seawater, Sequence Analysis, DNA, Sequence Homology, Nucleic Acid, Temperature, Water Microbiology
Résumé

A pluri-disciplinary in situ colonization experiment was performed to study early stages of colonization in deep-sea vent Alvinella spp. worm habitats. Four colonization devices were deployed onto Alvinella spp. colonies of different chimneys of the East-Pacific Rise (EPR 13 degrees N), for two different periods: a short (less than a week) and a longer one (3 weeks). Video imagery and monitoring of the thermal and physico-chemical conditions were performed during the colonization experiments. Numerous microorganisms bearing specialized adhesion-appendages and/or high amounts of polymeric extracellular matrix were observed on devices, which may efficiently contribute to the colonization of new surfaces. The microbial cohorts preceding and accompanying Alvinella spp. settlement were identified. In all cases, Archaea could not be detected and the microbial mats were essentially composed of e-Proteobacteria. Within this group, one phylotype (AlviH2) was found to dominate the libraries of three colonization devices. Dominance of e-Proteobacteria in the libraries may reflect the wide physiological variety encountered within this group or an adaptability of these microorganisms towards their changing environment. Bacteria affiliated to the Cytophaga-Flavobacterium-Bacteroides group or to the e-Proteobacteria, that grow either chemo-organoheterotrophically by fermentation or chemolithoautotrophically with H2 as an electron donor and S degrees /S2O32- or NO3- as a terminal electron acceptor, were isolated from one of the microbial mat formed in 20 days.

Alternate JournalEnviron. Microbiol.
Identifiant (ID) PubMed14871207