Spatial variability of bacterial community compositions in the Mariana Trench.

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Date: Oct. 2022
From: Canadian Journal of Microbiology(Vol. 68, Issue 10)
Publisher: NRC Research Press
Document Type: Report
Length: 6,022 words
Lexile Measure: 1430L

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Abstract :

Hadal microorganisms play an important role in the biogeochemical processes in marine ecosystems and act as a valuable resource for industrial applications. This paper presents the bacterial community analysis of samples taken from the Challenger Deep within the Mariana Trench, which is the deepest site in the ocean. High-throughput 16S rRNA gene amplicon sequencing was used to reveal that the vertically sampled bacterial populations at eight stations varied at the surface to 10 km depth. The surface water samples harbored a distinct bacterial assemblage, while the mesopelagic and bathyal samples manifested different bacterial community composition, which was not consistent with previous studies. Gammaproteobacteria was the most abundant bacteria in the bathyal and hadal waters. The hadal bacterial community consisted mostly of Alteromonadales and Oceanospirillales. The former was widely spread in the water column, which might suggest habitat partitioning at the genus and operational taxonomic unit levels, while the latter might represent hadal-enriched hydrocarbon degraders. The present work complements the current knowledge and understanding of the bathyal and hadal bacterial communities of the Mariana Trench. Key words: hadal microbial community, marine bacterial diversity, deep-sea microbiology, Challenger Deep Les microorganismes hadaux jouent un role important dans les processus biogeochimiques des ecosystemes marins et constituent une ressource precieuse pour les applications industrielles. Cet article presente l'analyse de la communaute bacterienne d'echantillons preleves dans le Challenger Deep, dans la fosse des Mariannes, qui est le site le plus profond de l'ocean. Le sequencage a haut debit des amplicons du gene de l'ARNr 16S a ete utilise pour reveler que les populations bacteriennes echantillonnees verticalement dans huit stations variaient de la surface a 10 km de profondeur. Les echantillons d'eau de surface abritaient un assemblage bacterien distinct, tandis que les echantillons mesopelagiques et bathyaux presentaient une composition de communaute bacterienne differente, ce qui ne correspondait pas aux etudes precedentes. Les Gammaproteobacteria etaient les bacteries les plus abondantes dans les eaux bathyales et hadales. La communaute bacterienne de l'eau hadale se composait principalement d'Alteromonadales et d'Oceanospirillales. Les premieres etaient largement repandues dans la colonne d'eau, ce qui pourrait suggerer un partage de l'habitat au niveau du genre et des UTO, tandis que les secondes pourraient representer des degradateurs d'hydrocarbures enrichis en zone hadale. Le present travail complete les connaissances et la comprehension actuelles des communautes bacteriennes bathyales et hadales de la fosse des Mariannes. [Traduit par la Redaction] Mots-cles : communaute microbienne hadale, diversite bacterienne marine, microbiologie des grands fonds, Challenger Deep

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Gale Document Number: GALE|A722294698