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[14] [15] Marine viruses, although microscopic and essentially unnoticed by scientists until recently, are the most abundant and diverse biological entities in the ocean. Viruses have an estimated abundance of 10 30 in the ocean, or between 10 6 and 10 11 viruses per millilitre. [4]
The origin of viruses is unclear because they do not form fossils, so molecular techniques have been used to compare the DNA or RNA of viruses and are a useful means of investigating how they arose. [36] Viruses are now recognised as ancient and as having origins that pre-date the divergence of life into the three domains. [37]
Organic matter produced by autotrophic bacteria is then used to support the upper trophic levels. The hydrothermal vent fluid and the surrounding ocean water is rich in elements such as iron , manganese and various species of sulfur including sulfide , sulfite , sulfate , elemental sulfur from which they can derive energy or nutrients. [ 9 ]
Heterotrophic bacterioplankton are main consumers of dissolved organic matter (DOM) in pelagic marine food webs, including the sunlit upper layers of the ocean. Their sensitivity to ultraviolet radiation (UVR), together with some recently discovered mechanisms bacteria have evolved to benefit from photosynthetically available radiation (PAR ...
Marine life, sea life or ocean life is the collective ecological communities that encompass all aquatic animals, plants, algae, fungi, protists, single-celled microorganisms and associated viruses living in the saline water of marine habitats, either the sea water of marginal seas and oceans, or the brackish water of coastal wetlands, lagoons ...
In the ocean, animal–microbial relationships were historically explored in single host–symbiont systems. However, new explorations into the diversity of marine microorganisms associating with diverse marine animal hosts is moving the field into studies that address interactions between the animal host and a more multi-member microbiome .
Viruses can infect and break open bacterial cells and (to a lesser extent), planktonic algae (a.k.a. phytoplankton). Therefore, viruses in the microbial food web act to reduce the population of bacteria and, by lysing bacterial cells, release particulate and dissolved organic carbon (DOC). [4] Bacteria
The names of realms consist of a descriptive first part and the suffix -viria, which is the suffix used for virus realms. [1] The first part of Duplodnaviria means "double DNA", referring to dsDNA viruses, [2] the first part of Monodnaviria means "single DNA", referring to ssDNA viruses, [3] the first part of Riboviria is taken from ribonucleic acid (RNA), [4] and the first part of ...