Ecological Dynamics of Marine Cyanobacteria
Summary
Marine cyanobacteria, chiefly the genera Prochlorococcus and Synechococcus, form the foundation of oceanic primary production and exert a profound influence on global biogeochemical cycles. These picocyanobacteria display remarkable physiological and genetic diversity that enables them to colonise stratified waters from equatorial gyres to high-latitude realms. Environmental gradients in light, temperature and nutrient availability shape the distribution of distinct ecotypes, each characterised by a specialised set of photosynthetic pigments, uptake systems and stress-response pathways. Microdiversity within these ecotypes drives fine-scale adaptation to local conditions, while population-level gene gain and loss modulates their metabolic repertoire. Interactions with heterotrophic microbes, including mutualistic antioxidant scavengers and commensal partners in nitrogen cross-feeding, further refine their ecological niches. Recent advances in high-resolution metagenomics and single-cell techniques have elucidated patterns of genome variation and metabolic exchange, revealing how these cyanobacteria maintain ecosystem resilience in the face of shifting ocean chemistry and climate change.
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Ecological Dynamics of Marine Cyanobacteria publication trend
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Technical terms
Ecotype: A genetic variant within a species that is adapted to specific environmental conditions.
Microdiversity: Fine-scale genetic variation among closely related organisms within a population.
Metagenome-Assembled Genome (MAG): A genome reconstructed from mixed environmental DNA sequences without prior cultivation.
Cross-feeding: Metabolic exchange in which one organism’s waste or by-product serves as a resource for another.
HNLC region: An oceanic zone rich in macronutrients but low in chlorophyll due to micronutrient (iron) limitation.
References
- Global scale phylogeography of functional traits and microdiversity in Prochlorococcus. The ISME Journal: Multidisciplinary Journal of Microbial Ecology (2023).
- Synechococcus nitrogen gene loss in iron-limited ocean regions. ISME Communications (2023).
- Production and cross-feeding of nitrite within Prochlorococcus populations. mBio (2023).
- Dependence of the Cyanobacterium Prochlorococcus on Hydrogen Peroxide Scavenging Microbes for Growth at the Ocean's Surface. PLOS ONE (2011).
- Patterns and Implications of Gene Gain and Loss in the Evolution of Prochlorococcus. PLOS Genetics (2007).
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