z-logo
Premium
Hydrostatic pressure influence activity and assembly of bacterial communities in reservoir sediments
Author(s) -
Wu Hainan,
Li Yi,
Zhang Wenlong,
Niu Lihua,
Gao Yu,
Hui Cizhang,
Bertilsson Stefan
Publication year - 2021
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/fwb.13697
Subject(s) - hydrostatic pressure , organic matter , sediment , microbial population biology , biogeochemical cycle , community structure , ecology , 16s ribosomal rna , microcosm , environmental chemistry , biology , environmental science , chemistry , bacteria , paleontology , physics , thermodynamics
Reservoir sediments are subjected to highly variable hydrostatic pressures, but little is known about the direct impacts of this environmental variable on microbial communities and biogeochemical processes mediated by microbes in the numerous deep reservoirs (>100 m) scattered across our planet. To address this gap, the organic matter degradation and community assembly of sediment bacteria were studied in bioreactors maintained under different hydrostatic pressures (0.5–3.0 MPa) and explored using 16S rRNA amplicon sequencing analysis. Our results showed that rates of CO 2 and CH 4 production and microbial activity decreased significantly with increasing pressure, at least when exceeding 1.0 MPa. In contrast, α‐diversity and community structure of the active (16S rRNA) and total (16S rRNA gene) bacterial communities did not show any significant response to the different hydrostatic pressures, but a co‐occurrence network demonstrated that interactions between bacterial populations were stronger at higher pressures (≥1.5 MPa). Moreover, ecological null model analyses revealed that when the pressure exceeded 1.5 MPa, the main assembly processes of bacterial communities changed from stochastic to deterministic. These findings corroborate an important role of pressure in the assembly and emerging interactions within sediment bacterial communities. Our results imply that increased hydrostatic pressure caused by dam constructions may hamper the metabolism of the sediment microbiota, and that this may result in enhanced sediment burial of nutrients and organic matter, at least when pressures exceed 1.0 MPa.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here