Marine Mucilage Dynamics in Semi-Enclosed Seas
Summary
Marine mucilage events in semi-enclosed seas arise from the aggregation of organic polymers exuded by phytoplankton and bacteria, leading to viscous aggregates that can span metres in scale. These phenomena are driven by interactions among nutrient loading, water-column stratification, temperature anomalies and microbe–alga symbioses. In coastal basins with limited water exchange, nutrient enrichment from terrestrial runoff and reduced flushing intensifies phytoplankton blooms, which then release high-molecular-weight polymers. Heterotrophic bacteria further transform and stabilise these polymers through the production of exopolysaccharides, promoting the formation of large mucilage aggregates. Seasonal and climatic factors, including elevated sea surface temperatures and prolonged stratification, extend residence times of organic matter and enhance the coalescence of marine snow into dense mucilage layers. Consequences of mucilage proliferation include hypoxia, disruption of food webs, transport of potential pathogens and impacts on fisheries, tourism and local economies. Understanding the balance between polymer production, microbial transformation and hydrodynamic dispersion is essential for predicting mucilage outbreaks and mitigating their ecological and societal effects.
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Marine Mucilage Dynamics in Semi-Enclosed Seas publication trend
The graph below shows the total number of articles in marine mucilage dynamics in semi-enclosed seas across all publications each year (not limited to Nature Index journals).
Technical terms
Marine mucilage: Gelatinous aggregates of organic polymers formed by the merging of marine snow particles and microbial exudates.
Exopolysaccharides (EPS): High-molecular-weight polymers secreted by microorganisms that facilitate cell adhesion and particle aggregation.
Extracellular matrix (ECM): A composite scaffold of organic molecules, including EPS, that embeds microbial cells and stabilises aggregates.
Unmanned surface vehicle (USV): A robotic vessel autonomously navigating and sampling water parameters to monitor marine phenomena.
References
- Bacteria contribute exopolysaccharides to an algal-bacterial joint extracellular matrix. npj Biofilms and Microbiomes (2024).
- An Autonomous Marine Mucilage Monitoring System. Sustainability (2023).
- Morphology, Molecular Genetics and Potential Importance for Mucilage Events of the New Coccolithophorid Ochrosphaera neapolitana in the Sea of Marmara. Journal of Marine Science and Engineering (2023).
- Climate Change and the Potential Spreading of Marine Mucilage and Microbial Pathogens in the Mediterranean Sea. PLOS ONE (2009).
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