Community composition and co-occurrence of free-living and particle-attached bacteria in the source region of the Ganges and Brahmaputra Rivers.
BCC
Diversity
FL
PA
Rivers
Tibetan Plateau
Journal
International microbiology : the official journal of the Spanish Society for Microbiology
ISSN: 1618-1905
Titre abrégé: Int Microbiol
Pays: Switzerland
ID NLM: 9816585
Informations de publication
Date de publication:
14 Oct 2024
14 Oct 2024
Historique:
received:
15
08
2024
accepted:
08
10
2024
revised:
06
10
2024
medline:
14
10
2024
pubmed:
14
10
2024
entrez:
14
10
2024
Statut:
aheadofprint
Résumé
Bacteria have two trophic lifestyles in aquatic ecosystems, i.e., free-living (FL) and particle-attached (PA), with different but essential ecological roles. However, relevant knowledge is still dearth in the upstream source region of the Himalayan Rivers. Thus, we emphasized a comparative study on community composition, co-occurrence, and geographic distribution of the FL and PA bacteria and the effect of environmental factors in the source region of the Ganges and Brahmaputra Rivers. PA bacteria relative to FL harbored a significantly higher local diversity, richness, and evenness. A significantly higher abundance of Betaproteobacteria, Verrucomicrobiota, and Planctomycetota in PA trophic lifestyle and Gammaproteobacteria and Actinomycetota in FL tropic lifestyle and indicator OTUs belonging to related taxa were observed. The spatial variation of the FL and PA bacterial communities was most significantly impacted by dispersal limitation as a discrete factor. Among the environmental parameters, the total nitrogen (TN) was found to be a significant (P < 0.001) driver of the variation in PA communities. Meanwhile, particulate organic carbon (POC) and TN considerably explained the variation of FL communities. A significant correlation (P < 0.001) of TN with dominant bacterial taxa (Pseudomonadota, Actinomycetota, and Verrucomicrobiota) and FL and PA indicator OTUs associated with these taxa further confirmed nitrogen as the limiting nutrient in the source region of the Ganges and Brahmaputra Rivers. The co-occurrence network topological characteristics showed that the PA network was more stable than the FL network, which was more complicated and unstable. Thus, it can be speculated that FL communities relative to PA are more vulnerable to shifting upon disturbances.
Identifiants
pubmed: 39400629
doi: 10.1007/s10123-024-00607-6
pii: 10.1007/s10123-024-00607-6
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Second Tibetan Plateau Scientific Expedition and Research Program (STEP)
ID : Grant no 2019QZKK0503
Informations de copyright
© 2024. The Author(s), under exclusive licence to Springer Nature Switzerland AG.
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