Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Importance of Local and Regional Scales in Shaping Mycobacterial Abundance in Freshwater Lakes

Abstract : Biogeographical studies considering the entire bacterial community may underestimate mechanisms of bacterial assemblages at lower taxonomic levels. In this context, the study aimed to identify factors affecting the spatial and temporal dynamic of the Mycobacterium, a genus widespread in aquatic ecosystems. Nontuberculous mycobacteria (NTM) density variations were quantified in the water column of freshwater lakes at the regional scale (annual monitoring of 49 lakes in the Paris area) and at the local scale (2-year monthly monitoring in Créteil Lake) by real-time quantitative PCR targeting the atpE gene. At the regional scale, mycobacteria densities in water samples ranged from 6.7 × 103 to 1.9 × 108 genome units per liter. Density variations were primarily explained by water pH, labile iron, and dispersal processes through the connection of the lakes to a river. In Créteil Lake, no spatial variation of mycobacterial densities was noticed over the 2-year monthly survey, except after large rainfall events. Indeed, storm sewer effluents locally and temporarily increased NTM densities in the water column. The temporal dynamic of the NTM densities in Créteil Lake was associated with suspended solid concentrations. No clear seasonal variation was noticed despite a shift in NTM densities observed over the 2012–2013 winter. Temporal NTM densities fluctuations were well predicted by the neutral community model, suggesting a random balance between loss and gain of mycobacterial taxa within Créteil Lake. This study highlights the importance of considering multiple spatial scales for understanding the spatio-temporal dynamic of bacterial populations in natural environments.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-enpc.archives-ouvertes.fr/hal-01685963
Contributeur : Frédérique Bordignon <>
Soumis le : mardi 16 janvier 2018 - 21:10:35
Dernière modification le : mercredi 22 avril 2020 - 10:48:01

Identifiants

Citation

Adélaïde Roguet, Claire Therial, Arnaud Catherine, Adèle Bressy, Gilles Varrault, et al.. Importance of Local and Regional Scales in Shaping Mycobacterial Abundance in Freshwater Lakes. Microbial Ecology, Springer Verlag, 2018, 75 (4), pp.834-846. ⟨10.1007/s00248-017-1088-6⟩. ⟨hal-01685963⟩

Partager

Métriques

Consultations de la notice

333