Tide driven microbial dynamics through virus-host interactions in the estuarine ecosystem.

Area of Science:

• Estuarine ecology
• Microbial ecology
• Marine virology

Background:

• Microbial communities are essential drivers of ecosystem functions.
• Viruses play a critical role in modulating microbial processes within ecosystems.
• The influence of tidal dynamics on estuarine viral and microbial communities is not well understood.

Purpose of the Study:

• To investigate the impact of tidal cycles on estuarine viral and microbial communities.
• To elucidate the interactions between viruses and microbes throughout a spring-neap tidal cycle.
• To understand how tidal functioning influences estuarine biogeochemical cycles.

Main Methods:

• Conducted an integrated investigation of viral and microbial communities over a full spring-neap tidal cycle.
• Monitored viral and microbial abundances, production, and decay rates.
• Analyzed bacterial production, community composition, and infection dynamics.

Main Results:

• Viral and microbial abundances showed significant oscillations, peaking during spring tides.
• Tidal dynamics influenced bacterial production and community composition, linked to viral infection variations.
• Neap tides exhibited higher viral decay, lower bacterial abundance, and inhibited metabolism, with a shift towards lysogenic viral infections.

Conclusions:

• Tidal cycles exert a major influence on estuarine microbial dynamics via virus-host interactions.
• These tide-driven interactions have significant, previously overlooked, cascading effects on estuarine biogeochemical cycles.
• Understanding tidal impacts is crucial for comprehending estuarine ecosystem functioning.