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Leboulanger Christophe, Agogue H., Bernard C., Bouvy Marc, Carré Claire, Cellamare M., Duval C., Fouilland E., Got P., Intertaglia L., Lavergne C., Le Floc'h E., Roques C., Sarazin G. (2017). Microbial diversity and cyanobacterial production in Dziani Dzaha crater lake, a unique tropical thalassohaline environment. Plos One, 12 (1), e0168879 [ p.]. ISSN 1932-6203

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Lien direct chez l'éditeur doi:10.1371/journal.pone.0168879

En Libre Accès sur HAL http://hal.ird.fr/hal-01465841v1

Titre
Microbial diversity and cyanobacterial production in Dziani Dzaha crater lake, a unique tropical thalassohaline environment
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000391612300063
AuteursLeboulanger Christophe, Agogue H., Bernard C., Bouvy Marc, Carré Claire, Cellamare M., Duval C., Fouilland E., Got P., Intertaglia L., Lavergne C., Le Floc'h E., Roques C., Sarazin G.
SourcePlos One, 2017, 12 (1), p. e0168879 [ p.]. p. e0168879 [ p.] ISSN 1932-6203
RésuméThis study describes, for the first time, the water chemistry and microbial diversity in Dziani Dzaha, a tropical crater lake located on Mayotte Island (Comoros archipelago, Western Indian Ocean). The lake water had a high level of dissolved matter and high alkalinity (10.614.5 g L-1 eq. CO32-, i.e. 160220 mM compare to around 22.5 in seawater), with salinity up to 52 psu, 1.5 higher than seawater. Hierarchical clustering discriminated Dziani Dzaha water from other alkaline, saline lakes, highlighting its thalassohaline nature. The phytoplankton biomass was very high, with a total chlorophyll a concentration of 524 to 875 mu g chl a L-1 depending on the survey, homogeneously distributed from surface to bottom (4 m). Throughout the whole water column the photosynthetic biomass was dominated (>97% of total biovolume) by the filamentous cyanobacteria Arthrospira sp. with a straight morphotype. In situ daily photosynthetic oxygen production ranged from 17.3 to 22.2 g O-2 m(-2) d(-1), consistent with experimental production / irradiance measurements and modeling. Heterotrophic bacterioplankton was extremely abundant, with cell densities up to 1.5 108 cells mL(-1) in the whole water column. Isolation and culture of 59 Eubacteria strains revealed the prevalence of alkaliphilic and halophilic organisms together with taxa unknown to date, based on 16S rRNA gene analysis. A single cloning-sequencing approach using archaeal 16S rDNA gene primers unveiled the presence of diverse extremophilic Euryarchaeota. The water chemistry of Dziani Dzaha Lake supports the hypothesis that it was derived from seawater and strongly modified by geological conditions and microbial activities that increased the alkalinity. Dziani Dzaha has a unique consortium of cyanobacteria, phytoplankton, heterotrophic Eubacteria and Archaea, with very few unicellular protozoa, that will deserve further deep analysis to unravel its uncommon diversity. A single taxon, belonging to the genus Arthrospira, was found responsible for almost all photosynthetic primary production.
Plan de classementEcologie, systèmes aquatiques [036] ; Biotechnologies [084]
Descr. géo.COMORES ; MAYOTTE
LocalisationFonds IRD [F B010068885]
Identifiant IRDfdi:010068885
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010068885

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