INTECH   27907
INSTITUTO TECNOLOGICO DE CHASCOMUS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Ecological processes shaping the bacterial metacommunity at different taxonomic resolutions
Autor/es:
QUIROGA M.V.; CASA, V.; MATALONI, G.; COWAN, D.A.; VALVERDE, ANGEL; STEGEN, J.
Reunión:
Congreso; ISME Virtual Microbial Ecology Summit; 2020
Institución organizadora:
International Society for Microbial Ecology (ISME)
Resumen:
Session 5 - Selected Talk, Poster 159. The metacommunity theory proposes that local habitats are connected by dispersal, and species within each local habitat respond to biotic and abiotic interactions, influencing community assembly. These ecological processes could operate at different space, time and phylogenetic scales. Here, we studied bacterial assembly processes at one specific sampling time (summer 2018), a relatively small spatial scale (1 square kilometer encompassing Punta Cierva wetland complex, Antarctic Peninsula) and two different phylogenetic scales. Though Punta Cierva has been long recognized as a biodiversity hotspot, and despite the key role of microbes in Antarctic environments, neither the structure of its bacterial metacommunity nor the ecological processes driving it had been studied so far. We aimed at determining whether the distinct features of each environment would impose selection processes on community assembly, or these would be overridden by high hydrological connectivity, which would favor high levels of dispersal, imposing biotic homogenization. We analyzed high-throughput 16S rRNA gene amplicons, using both operational taxonomic units (at 97% cutoff) and amplicon sequence variants (ASV), from eight different wetland microenvironments at Punta Cierva. We applied null models on phylogenetic data to quantitatively estimate the influences of selection and dispersal on community assembly. We observed different relative contributions of these ecological processes depending on the taxonomic resolution. Microbial community structure based on OTUs revealed a stochastic system undominated by any particular process, while homogeneous selection mainly determined (>60%) microbial community structure based on ASVs. Overall, the higher taxonomic resolution of ASVs unveiled deterministic processes related to microdiversity patterns not detected at the OTU level.