Dispersal shapes compositional and functional diversity in aquatic microbial communities.

Rain-Franco, Angel ORCID: https://orcid.org/0000-0002-0389-7154; Le Moigne, Alizée ORCID: https://orcid.org/0000-0002-9709-0211; Serra Moncadas, Lucas ORCID: https://orcid.org/0000-0001-5375-4074; Silva, Marisa O. D.; Andrei, Adrian-Stefan ORCID: https://orcid.org/0000-0003-1425-7168 et Pernthaler, Jakob ORCID: https://orcid.org/0000-0001-7558-909X (2024). Dispersal shapes compositional and functional diversity in aquatic microbial communities. mSystems , vol. 9 , nº 12. e01403-24. DOI: 10.1128/msystems.01403-24.

Prévisualisation

PDF - Version publiée Télécharger (2MB) | Prévisualisation

Résumé

Segregation and mixing shape the structure and functioning of aquatic microbial communities, but their respective roles are challenging to disentangle in field studies. We explored the hypothesis that functional differences and beta diversity among stochastically assembled communities would increase in the absence of dispersal. Contrariwise, we expected biotic selection during homogenizing dispersal to reduce beta and gamma diversity as well as functional variability. This was experimentally addressed by examining the compositional and functional changes of 20 freshwater bacterial assemblages maintained at identical conditions over seven growth cycles for 34 days and subjected to two consecutive dispersal regimes. Initial dispersal limitation generated high beta diversity and led to the repeated emergence of community types that were dominated by particular taxa. Compositional stability and evenness of the community types varied over successive growth cycles, reflecting differences in functional properties. Carbon use efficiency increased during cultivation, with some communities of unique composition outperforming the replicate community types. Homogenizing dispersal led to high compositional similarity and reduced gamma diversity. While a neutral and a competition-based (Elo-rating) model together largely explained community assembly, a pseudomonad disproportionally dominated across communities, possibly due to interaction-related genomic traits. In conclusion, microbial assemblages stochastically generated by dispersal limitation can be gradually “refined” into distinct community types by subsequent deterministic processes. Segregation of communities represented an insurance mechanism for highly productive but competitively weak microbial taxa that were excluded during community coalescence.

Type de document:	Article
Mots-clés libres:	assembly processes; carbon use efficiency; coexistence; community functioning; dispersal limitation; Elo-rating; homogenizing dispersal
Centre:	Centre Eau Terre Environnement
Date de dépôt:	14 janv. 2025 14:50
Dernière modification:	14 janv. 2025 14:50
URI:	https://espace.inrs.ca/id/eprint/16252

Gestion Actions (Identification requise)

Modifier la notice