Microbial Ecology of Freshwater Systems
Summary
Freshwater systems host diverse microbial communities that underpin critical ecosystem functions and global biogeochemical cycles. Bacteria, archaea, protists and viruses populate lakes, rivers, wetlands and groundwater, exhibiting spatial stratification across epilimnetic, metalimnetic and hypolimnetic zones and dynamic responses to temperature, nutrient inputs and hydrodynamics. Culture-independent approaches—especially high-throughput sequencing, single-cell genomics and imaging—have revealed abundant uncultivated lineages and novel metabolic pathways. Microbial processes include carbon fixation, organic matter decomposition, nitrification, denitrification, nitrogen fixation and sulphur and phosphorus cycling, which collectively regulate greenhouse-gas fluxes and water quality. Viral interactions, encompassing lytic cycles and horizontal gene transfer via genomic islands, shape community composition and functional potential. Genome-resolved studies have elucidated streamlining of oligotrophic lineages and niche partitioning among closely related taxa, while depth-discrete metagenomics and microscopy have mapped vertical and seasonal successions. Insights into microbial ecology of freshwater habitats guide management of harmful blooms, eutrophication and pathogen dispersal. Integration of multi-omics, experimental mesocosms and ecological modelling promises predictive understanding of how microbial communities respond to anthropogenic stress and climate change.
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Microbial Ecology of Freshwater Systems publication trend
The graph below shows the total number of articles in microbial ecology of freshwater systems across all publications each year (not limited to Nature Index journals).
Technical terms
Metagenomics: Culture-independent sequencing and analysis of genetic material recovered directly from environmental samples.
Metagenome-assembled genome (MAG): A genome reconstructed from metagenomic sequence data representing an uncultivated organism.
Genome streamlining: Reduction of genome size and content through evolutionary selection for efficiency in nutrient-poor environments.
Epilimnion/hypolimnion: The warm, light-penetrated upper layer and the colder, deeper layer of a stratified lake, respectively.
Genomic island: A discrete genomic region acquired by horizontal gene transfer often encoding adaptive functions such as metabolism or defence.
References
- High-resolution metagenomic reconstruction of the freshwater spring bloom. Microbiome (2023).
- Flexible genomic island conservation across freshwater and marine Methylophilaceae. The ISME Journal: Multidisciplinary Journal of Microbial Ecology (2024).
- Depth-discrete metagenomics reveals the roles of microbes in biogeochemical cycling in the tropical freshwater Lake Tanganyika. The ISME Journal: Multidisciplinary Journal of Microbial Ecology (2021).
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