Freshwater metagenome
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA271031 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Deep subseafloor biogeochemical processes and microbial populations
| PRJDB13255 | ENA
Project description:Environmental variation along the geographical space can shape populations by natural selection. In the context of global warming and changing precipitation regimes, it is crucial to understand the role of environmental heterogeneity in tropical trees adaptation, given their disproportional contribution to water and carbon biogeochemical cycles. Here, we investigated how heterogeneity in freshwater availability along tropical wetlands has influenced molecular variations of the black mangrove (Avicennia germinans). A total of 57 trees were sampled at seven sites differing markedly in precipitation regime and riverine freshwater inputs. Using 2,297 genome‐wide single nucleotide polymorphic markers, we found signatures of natural selection by the association between variations in allele frequencies and environmental variables, including the precipitation of the warmest quarter and the annual precipitation. Additionally, we found candidate loci for selection based on statistical deviations from neutral expectations of interpopulation differentiation. Most candidate loci within transcribed sequences were functionally associated with central aspects of drought tolerance or plant response to drought. Moreover, our results suggest the occurrence of the rapid evolution of a population, probably in response to sudden and persistent limitations in plant access to soil water, following a road construction in 1974. Observations supporting rapid evolution included the reduction in tree size and changes in allele frequencies and in transcript expression associated with increased drought tolerance through the accumulation of osmoprotectants and antioxidants, biosynthesis of cuticles, protection against protein degradation, stomatal closure, photorespiration and photosynthesis. We describe a major role of spatial heterogeneity in freshwater availability in the specialization of this typically tropical tree.
2020-05-15 | GSE123659 | GEO
Project description:Biogeochemical processes governing boreal carbon cycling
| PRJEB72786 | ENA
Project description:Microbial Processes and Biodiversity: BIOTA
| PRJNA411849 | ENA
Project description:Microbial Processes and Biodiversity: AMAZON BASIN
| PRJNA414894 | ENA
Project description: Not available
| S-EPMC5615132 | biostudies-literature
Project description:<p>Background:</p><p>Primary succession is predicted to proceed through shifts from stress-tolerant to competitive to cooperative ecological strategies as resource availability increases, yet molecular evidence for these transitions in microbial systems remains limited. Here, we used an integrated multi-omics approach to investigate how microbial functional traits and chemical outputs change across early ecosystem development using experimental basaltic hillslopes spanning succession from bare rock through biocrust to moss-dominated communities.</p><p> </p><p>Results:</p><p>Genome-resolved analyses revealed stress-tolerant pioneer communities enriched in oxidative and temperature stress-response genes on nitrogen-limited and physically unstable basalt. These communities were replaced by competitive nitrogen-fixing cyanobacteria that formed biocrusts enriched in carbon and nitrogen fixation pathways while stabilizing substrates through exopolysaccharide production. This stabilization enabled the establishment of functionally diverse moss-associated communities characterized by complete biogeochemical cycling and cooperative metabolic interactions. Metabolomic profiling linked these functional transitions to distinct chemical signatures across succession. Early stages were enriched in organic nitrogen- and sulfur-containing compounds, intermediate stages accumulated nucleosides and organic acids, and later stages were characterized by complex lipids and secondary metabolites. Metabolites discriminated successional stages with substantially higher accuracy than taxonomic markers, indicating that functional outputs in this system more reliably capture ecosystem state than community composition. While microbial community assembly shifted from stochastic to deterministic processes over succession, metabolite assembly remained predominantly deterministic throughout.</p><p> </p><p>Conclusions:</p><p>Integration across genomic and metabolomic data demonstrates that cyanobacterial nitrogen fixation coupled with substrate stabilization alleviates nutrient limitation and modifies physical habitat conditions, driving successional progression through ecological strategy shifts. These results advance succession theory by showing that biogeochemical and physical processes operate in tandem rather than sequentially. These molecular insights provide the first comprehensive evidence for predicted ecological strategy shifts at the molecular level and offer a framework for ecosystem monitoring and restoration, with stage specific metabolic signatures serving as quantitative biomarkers for assessing recovery trajectories.</p>
2026-03-12 | MTBLS14041 | MetaboLights
Project description: Not available
| S-EPMC5673642 | biostudies-literature
Project description: Not available
| S-EPMC7265639 | biostudies-literature