Marine virus predation by non-host organisms.

Area of Science:

• Marine Biology
• Environmental Science
• Virology

Background:

• Viruses are abundant in marine environments, yet their removal by non-host organisms is poorly understood.
• Understanding viral dynamics is crucial for marine ecosystem health.

Purpose of the Study:

• To investigate the capacity of various marine non-host organisms to remove viruses.
• To quantify the viral removal rates by different species.

Main Methods:

• Utilized the marine algal virus PgV-07T as a model system.
• Employed flow cytometry to differentiate the model virus from bacteriophages.
• Assessed viral abundance reduction over 24 hours in the presence of various invertebrates.

Main Results:

• Anemones, polychaete larvae, sea squirts, crabs, cockles, oysters, and sponges significantly reduced viral abundance.
• Sponges, oysters, and cockles demonstrated the highest viral removal rates (up to 98%).
• Breadcrumb sponges exhibited rapid and sustained high-rate virus removal.

Conclusions:

• Ambient non-host organisms play a significant, overlooked role in marine viral ecology.
• Temperate sponges possess substantial potential for continuous and effective virus removal from the water column.
• Natural viral loss in marine environments has likely been underestimated.