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Nat Rev Microbiol. 2007 Oct;5(10):801-12.

Marine viruses--major players in the global ecosystem.

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University of British Columbia, Departments of Earth and Ocean Sciences, Botany, and Microbiology and Immunology, 1461 BioSciences, 6270 University Boulevard, Vancouver, British Columbia V6T 1Z4, Canada.


Viruses are by far the most abundant 'lifeforms' in the oceans and are the reservoir of most of the genetic diversity in the sea. The estimated 10(30) viruses in the ocean, if stretched end to end, would span farther than the nearest 60 galaxies. Every second, approximately 10(23) viral infections occur in the ocean. These infections are a major source of mortality, and cause disease in a range of organisms, from shrimp to whales. As a result, viruses influence the composition of marine communities and are a major force behind biogeochemical cycles. Each infection has the potential to introduce new genetic information into an organism or progeny virus, thereby driving the evolution of both host and viral assemblages. Probing this vast reservoir of genetic and biological diversity continues to yield exciting discoveries.

[Indexed for MEDLINE]

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