Global biogeography of prokaryotes in mangrove sediments: Spatial patterns and ecological insights from 16S rDNA metabarcoding
2025
Jamon-Haon, Emma | Cuny, Philippe | Rossi, Alix | Sylvi, Léa | Fiard, Maud | Militon, Cécile | Institut méditerranéen d'océanologie (MIO) ; Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) | Institut Pythéas (OSU PYTHEAS) ; Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
International audience
Mostrar más [+] Menos [-]Inglés. The global asymmetry in mangrove floristic diversity is well-documented, yet the biogeography of sedimentmicrobial communities remains overlooked. This meta-analysis of 16S rDNA datasets from 12 countries investigates the diversity, composition, and distribution of prokaryotic communities across mangrove bioregions.We found no significant correlation between tree richness and microbial diversity, but identified a microbialhotspot in the Indo-West Pacific. Microbiota associated with different mangroves displayed opposite latitudinaldiversity gradients and beta-dispersions. Random forest models highlighted key microbial taxa, while sharedOTUs across bioregions suggested a core mangrove microbiota. Importantly, substantial heterogeneity inmicrobiota composition was strongly influenced by methodological factors such as molecular protocols used inthe different studies. While these variations limit direct dataset comparisons, they underscore the urgent need formore consistent and harmonized sampling and sequencing approaches in future research. Despite these challenges,the observed distance-decay relationship supports the role of dispersal barriers in shaping mangrovesediment microbiota. This study provides insights into the potential influence of environmental factors, beyondplant diversity alone, in structuring prokaryotic communities in mangrove sediments. By acknowledgingmethodological biases and proposing standardized frameworks for future research, we aim to refine our understandingof mangrove microbiome dynamics and their ecological implications.
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