User:Biol.hector.g

Marine viruses are viruses that replicate inside the living cells of marine organisms. Although the story of marine viruses is still emerging, it is becoming increasingly clear that we need to incorporate viruses and virus-mediated processes into our understanding of ocean biology and biogeochemistry. 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 10³⁰ viruses in the ocean, if stretched end to end, would span farther than the nearest 60 galaxies. Every second, approximately 10²³ 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.