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Bacteria, Archaea, Eukaryota, and viruses
- The term “marine microbe” covers a diversity of microorganisms, including Bacteria, Archaea, Eukaryota, and viruses. These organisms are exceedingly small—only 1/8000th the volume of a human cell and spanning about 1/100th the diameter of a human hair. Up to a million of them live in just one milliliter of seawater.
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Some microbiologists also classify viruses as microorganisms, but others consider these as non-living. [2] [3] Marine microorganisms have been variously estimated to make up about 70%, [4] or about 90%, [5] [6] of the biomass in the ocean. Taken together they form the marine microbiome.
The term “marine microbe” covers a diversity of microorganisms, including Bacteria, Archaea, Eukaryota, and viruses. These organisms are exceedingly small—only 1/8000th the volume of a human cell and spanning about 1/100th the diameter of a human hair. Up to a million of them live in just one milliliter of seawater.
Marine Microbes: Did You Know? What are marine microbes? The term “marine microbe” covers a diversity of microorganisms, including microalgae, bacteria and archaea, protozoa fungi and viruses (Photo 1 to 5). These can be prokaryotes (i.e., organisms whose cells lack membrane‐encased nuclei) and eukaryotes (i.e., organisms with true nuclei).
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Animals are not drawn to scale. Marine animals share the sea with a vast diversity of microorganisms, including protists, bacteria, archaea, fungi, and viruses which comprise millions of cells in each milliliter of the 1.3 billion km 3 of water comprising the oceans ( Eakins and Sharman, 2010 ).
Microorganisms represent 90% of the biomass in the oceans. There are 10 6 bacterial and archaeal cells and 10 7 viral particles in 1 ml of seawater. The total of microorganisms in the open ocean amounts to >10 29 (Whitman et al. 1998).
A simple definition says marine microbes are just that—any microorganisms found in marine systems. However, this description does not exclude organisms that wash into the oceans from land and are not suited for growth in the marine environment.
Jul 10, 2014 · The most common of these—a bacterium called Prochlorococcus bacterium called Prochlorococcus— was only discovered three decades ago, but it’s so abundant that there can be hundreds and...
