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Marine viruses — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Marine_viruses
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T14:49:45.252Z
SHA-256 of the archived text: fe9e85de0ed8095210a852107321e0fe8bcf450b59eaea271ea8eaddf3645da2
Stable URL of this page: https://metraipolis.com/documento/dc_fabe119466ca

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Marine viruses — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Marine_viruses (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_fabe119466ca (Metraipolis archive dc_fabe119466ca, sha256 fe9e85de0ed8095210a852107321e0fe8bcf450b59eaea271ea8eaddf3645da2)

BibTeX

@misc{dcfabe119466ca,
  title = {Marine viruses — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Marine_viruses},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_fabe119466ca; sha256 fe9e85de0ed8095210a852107321e0fe8bcf450b59eaea271ea8eaddf3645da2},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Marine_viruses. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Marine viruses are defined by their habitat as viruses that are found in marine environments, that is, in the saltwater of seas or oceans or the brackish water of coastal estuaries. Viruses are small infectious agents that can only replicate inside the living cells of a host organism, because they need the replication machinery of the host to do so. They can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. When not inside a cell or in the process of infecting a cell, viruses exist in the form of independent particles called virions. A virion contains a genome (a long molecule that carries genetic information in the form of either DNA or RNA) surrounded by a capsid (a protein coat protecting the genetic material). The shapes of these virus particles range from simple helical and icosahedral forms for some virus species to more complex structures for others. Most virus species have virions that are too small to be seen with an optical microscope. The average virion is about one one-hundredth the linear size of the average bacterium. A teaspoon of seawater typically contains about fifty million viruses. Most of these viruses are bacteriophages which infect and destroy marine bacteria and control the growth of phytoplankton at the base of the marine food web. Bacteriophages are harmless to plants and animals but are essential to the regulation of marine ecosystems. They supply key mechanisms for recycling ocean carbon and nutrients. In a process known as the viral shunt, organic molecules released from dead bacterial cells stimulate fresh bacterial and algal growth. In particular, the breaking down of bacteria by viruses (lysis) has been shown to enhance nitrogen cycling and stimulate phytoplankton growth. Viral activity also affects the biological pump, the process which sequesters carbon in the deep ocean. By increasing the amount of respiration in the oceans, viruses are indirectly responsible for reducing the amount of carbon dioxide in the atmosphere by approximately 3 gigatonnes of carbon per year. Marine microorganisms make up about 70% of the total marine biomass. It is estimated marine viruses kill 20% of the microorganism biomass every day. Viruses are the main agents responsible for the rapid destruction of harmful algal blooms which often kill other marine life. The number of viruses in the oceans decreases further offshore and deeper into the water, where there are fewer host organisms. Viruses are an important natural means of transferring genes between different species, which increases genetic diversity and drives evolution. It is thought viruses played a central role in early evolution before the diversification of bacteria, archaea and eukaryotes, at the time of the last universal common ancestor of life on Earth. Viruses are still one of the largest areas of unexplored genetic diversity on Earth.

Tema degli esploratori: terra, clima ed energia (deposito sistematico; ricerca «carbon cycle»).
Fonte: Wikipedia in inglese, voce «Marine viruses» — https://en.wikipedia.org/wiki/Marine_viruses
Wikidata Q96392018 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q96392018
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Marine_viruses?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1369641425, consultata il 2026-10-07T14:22:28.910Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 34d74cadd28c7a93f4c114f9a6106c5bfaff9ee4b9712564e10c443697c60ca7