Publications des scientifiques de l'IRD

Schwob G., Segovia N. I., Gonzalez-Wevar C., Cabrol Léa, Orlando J., Poulin E. (2021). Exploring the microdiversity within marine bacterial taxa : toward an integrated biogeography in the Southern Ocean. Frontiers in Microbiology, 12, 703792 [18 p.].

Titre du document
Exploring the microdiversity within marine bacterial taxa : toward an integrated biogeography in the Southern Ocean
Année de publication
2021
Type de document
Article référencé dans le Web of Science WOS:000679805800001
Auteurs
Schwob G., Segovia N. I., Gonzalez-Wevar C., Cabrol Léa, Orlando J., Poulin E.
Source
Frontiers in Microbiology, 2021, 12, 703792 [18 p.]
Most of the microbial biogeographic patterns in the oceans have been depicted at the whole community level, leaving out finer taxonomic resolution (i.e., microdiversity) that is crucial to conduct intra-population phylogeographic study, as commonly done for macroorganisms. Here, we present a new approach to unravel the bacterial phylogeographic patterns combining community-wide survey by 16S rRNA gene metabarcoding and intra-species resolution through the oligotyping method, allowing robust estimations of genetic and phylogeographic indices, and migration parameters. As a proof-of-concept, we focused on the bacterial genus Spirochaeta across three distant biogeographic provinces of the Southern Ocean; maritime Antarctica, sub-Antarctic Islands, and Patagonia. Each targeted Spirochaeta operational taxonomic units were characterized by a substantial intrapopulation microdiversity, and significant genetic differentiation and phylogeographic structure among the three provinces. Gene flow estimations among Spirochaeta populations support the role of the Antarctic Polar Front as a biogeographic barrier to bacterial dispersal between Antarctic and sub-Antarctic provinces. Conversely, the Antarctic Circumpolar Current appears as the main driver of gene flow, connecting sub-Antarctic Islands with Patagonia and maritime Antarctica. Additionally, historical processes (drift and dispersal limitation) govern up to 86% of the spatial turnover among Spirochaeta populations. Overall, our approach bridges the gap between microbial and macrobial ecology by revealing strong congruency with macroorganisms distribution patterns at the populational level, shaped by the same oceanographic structures and ecological processes.
Plan de classement
Limnologie biologique / Océanographie biologique [034] ; Ecologie, systèmes aquatiques [036] ; Biotechnologies [084]
Description Géographique
ANTARCTIQUE
Localisation
Fonds IRD [F B010082637]
Identifiant IRD
fdi:010082637
Contact