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Population dynamics of Pelagibacterales clonal lineages: ecological-consortia and frequency modulation

Rodriguez-Valera, F.; Haro-Moreno, J. M.; Martin-Cuadrado, A.-B.

2026-07-01 microbiology
10.64898/2026.06.30.735289 bioRxiv
Show abstract

Pelagibacterales gMED is the dominant epipelagic genomospecies in the western Mediterranean Sea. We used the O-chain biosynthesis gene clusters, OBCs, as clonal barcodes to analyse strain-level population structure. In total, 385 OBC-defined clonal lineages were tracked across Mediterranean metagenomes spanning 14 years and depths from 5 to 90 m within the photic zone, with between 128 and 336 detected per metagenome. The relative conservation of dominant OBC types across years, seasons, and geographic locations indicated a persistently high and stable clonal diversity.

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