Microbial Extracellular Polymeric Substances (EPSs) in Ocean Systems.

Area of Science:

• Marine microbiology
• Biogeochemistry
• Oceanography

Background:

• Microbial cells in oceans produce extracellular polymeric substances (EPS), also known as exopolymers.
• EPS facilitate microbial attachment, forming biofilms and marine snow aggregates in oceanic environments.
• EPS secretion is a fundamental microbial adaptation influencing numerous ocean processes.

Purpose of the Study:

• To summarize the diverse roles of exopolymers in marine systems.
• To highlight the importance of EPS in microbial ecology and ocean processes.
• To underscore the need for further research into EPS ultrastructure and interactions.

Main Methods:

• Literature review and synthesis of existing research on microbial exopolymers.
• Analysis of the physical and chemical properties of EPS.
• Examination of the ecological and biogeochemical impacts of EPS.

Main Results:

• EPS play critical roles in biofilm formation, marine snow aggregation, and altering seawater optical properties.
• EPS are involved in biogeomineral precipitation, genetic material transfer, and the formation of various oceanic structures like TEPs and marine oil snow.
• EPS contribute to carbon cycling, trophic transfer of contaminants, and provide protection for pathogenic cells, especially in extreme environments.

Conclusions:

• EPS are crucial components of marine microbial ecology, influencing a wide range of oceanographic processes.
• Further investigation into the physical interactions and ultrastructure of EPS is needed.
• Understanding EPS is vital for comprehending microbial impacts on ocean systems, carbon cycling, and contaminant transport.