Diversity of Viruses Infecting Eukaryotic Algae

Area of Science:

• Marine biology
• Virology
• Ecology

Background:

• Algae are crucial primary producers in aquatic ecosystems.
• Viruses infecting eukaryotic algae play significant roles in algal ecology and evolution.
• Understanding algal virus diversity is key to comprehending aquatic ecosystem dynamics.

Purpose of the Study:

• To review and summarize current knowledge on algal virus diversity.
• To highlight the ecological and evolutionary significance of algal viruses.
• To discuss both formally classified and unclassified algal viruses.

Main Methods:

• Literature review of existing research on algal viruses.
• Referencing formal taxonomic classifications from the International Committee on Taxonomy of Viruses (ICTV).
• Discussion of unclassified viruses alongside their classified relatives.

Main Results:

• Recognition of 61 distinct algal virus taxa with diverse morphologies and genome types (dsDNA, ssDNA, dsRNA, ssRNA).
• Algal viruses exhibit a wide range of genome sizes (4.4–560 kb) and virion diameters (20–210 nm).
• These viruses are generally lytic and exhibit high species or strain specificity, infecting a broad range of algae.

Conclusions:

• Algal viruses are diverse, dynamic, and ecologically significant components of aquatic environments.
• Further research is needed to fully elucidate the extent of algal virus diversity and their impact.
• Algal viruses influence aquatic primary production, food webs, and algal evolution.