Marine microorganisms sequester large amounts of carbon and produce much of the world's oxygen.
A small proportion of marine microorganisms are pathogenic, causing disease and even death in marine plants and animals.[9] However marine microorganisms recycle the major chemical elements, both producing and consuming about half of all organic matter generated on the planet every year. As inhabitants of the largest environment on Earth, microbial marine systems drive changes in every global system.
In July 2016, scientists reported identifying a set of 355 genes from the last universal common ancestor (LUCA) of all life on the planet, including the marine microorganisms.[10] Despite its diversity, microscopic life in the oceans is still poorly understood. For example, the role of viruses in marine ecosystems has barely been explored even in the beginning of the 21st century.[11]
Overview
microbial mats
Stromatolites
are formed from microbial mats as microbes slowly move upwards to avoid being smothered by sediment.
marine biomass.[4] A microorganism, or microbe, is a microscopicorganism too small to be recognised adequately with the naked eye. In practice, that includes organisms smaller than about 0.1 mm.[12]
: 13
Such organisms can be
fungal-like protists, as well as certain microscopic animals such as rotifers. Many macroscopic animals and plants have microscopic juvenile stages. Some microbiologists also classify viruses as microorganisms, but others consider these as non-living.[2][3]
Microorganisms are crucial to nutrient recycling in
While recent technological developments and scientific discoveries have been substantial, we still lack a major understanding at all levels of the basic ecological questions in relation to the microorganisms in our seas and oceans. These fundamental questions are:
1. What is out there? Which microorganisms are present in our seas and oceans and in what numbers
do they occur?
2. What are they doing? What functions do each of these microorganisms perform in the marine environment and how do they contribute to the global cycles of energy and matter?
3. What are the factors that determine the presence or absence of a microorganism and how do they influence biodiversity and function and vice versa?
The range of sizes shown by prokaryotes (bacteria and archaea) and viruses relative to those of other organisms and biomoleculesUnder a magnifier, a splash of seawater teems with microscopic life
Microscopic life undersea is diverse and still poorly understood, such as for the role of viruses in marine ecosystems.[13] Most marine viruses are bacteriophages, which are harmless to plants and animals, but are essential to the regulation of saltwater and freshwater ecosystems.[14] They infect and destroy bacteria in aquatic microbial communities, and are the most important mechanism of recycling carbon in the marine environment. The organic molecules released from the dead bacterial cells stimulate fresh bacterial and algal growth.[15] Viral activity may also contribute to the biological pump, the process whereby carbon is sequestered in the deep ocean.[16]
Sea spray containing marine microorganisms can be swept high into the atmosphere where they become aeroplankton, and can travel the globe before falling back to earth.
A stream of airborne microorganisms circles the planet above weather systems but below commercial air lanes.[17] Some peripatetic microorganisms are swept up from terrestrial dust storms, but most originate from marine microorganisms in sea spray. In 2018, scientists reported that hundreds of millions of viruses and tens of millions of bacteria are deposited daily on every square meter around the planet.[18][19]
Microscopic organisms live throughout the
Methanopyrus kandleri).[25] In 2014, scientists confirmed the existence of microorganisms living 800 m (2,600 ft) below the ice of Antarctica.[26][27] According to one researcher, "You can find microbes everywhere — they're extremely adaptable to conditions, and survive wherever they are."[21] Marine microorganisms serve as "the foundation of all marine food webs, recycling major elements and producing and consuming about half the organic matter generated on Earth each year".[28][29]
Marine viruses
Virus-host interactions in the marine ecosystem, including viral infection of bacteria, phytoplankton and fish[30]
When not inside an infected cell or in the process of infecting a cell, viruses exist in the form of independent particles. These viral particles, also known as
bacterium
.
The origins of viruses in the
evolutionary history of life are unclear: some may have evolved from plasmids—pieces of DNA that can move between cells—while others may have evolved from bacteria. In evolution, viruses are an important means of horizontal gene transfer, which increases genetic diversity.[32] Viruses are considered by some to be a life form, because they carry genetic material, reproduce, and evolve through natural selection. However, they lack key characteristics (such as cell structure) that are generally considered necessary to count as life. Because they possess some but not all such qualities, viruses have been described as "organisms at the edge of life"[33] and as replicators.[34]
Bacteriophages (phages)
Multiple phages attached to a bacterial cell wall at 200,000x magnification
Viruses are found wherever there is life and have probably existed since living cells first evolved.[35] 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]
Opinions differ on whether viruses are a form of life or organic structures that interact with living organisms.[34] They are considered by some to be a life form, because they carry genetic material, reproduce by creating multiple copies of themselves through self-assembly, and evolve through natural selection. However they lack key characteristics such as a cellular structure generally considered necessary to count as life. Because they possess some but not all such qualities, viruses have been described as replicators[34] and as "organisms at the edge of life".[33]
Marine phages parasite marine bacteria and archaea, such as cyanobacteria.[38] They are a common and diverse group of viruses and are the most abundant biological entity in marine environments, because their hosts, bacteria, are typically the numerically dominant cellular life in the sea. Generally there are about 1 million to 10 million viruses in each mL of seawater, or about ten times more double-stranded DNA viruses than there are cellular organisms,[39][40] although estimates of viral abundance in seawater can vary over a wide range.[41][42]
For a long time, tailed phages of the order Caudovirales seemed to dominate marine ecosystems in number and diversity of organisms.[38]
However, as a result of more recent research, non-tailed viruses appear to be dominant in multiple depths and oceanic regions, followed by the Caudovirales families of myoviruses, podoviruses, and siphoviruses.[43]
Phages belonging to the families:
Corticoviridae,[44]
There are also archaean viruses which replicate within archaea: these are double-stranded DNA viruses with unusual and sometimes unique shapes.[51][52] These viruses have been studied in most detail in the thermophilic archaea, particularly the orders Sulfolobales and Thermoproteales.[53]
Role of viruses
Microorganisms make up about 70% of the marine biomass.[4] It is estimated viruses kill 20% of this biomass each day and that there are 15 times as many viruses in the oceans as there are bacteria and archaea. Viruses are the main agents responsible for the rapid destruction of harmful algal blooms,[40] which often kill other marine life.[54]
The number of viruses in the oceans decreases further offshore and deeper into the water, where there are fewer host organisms.[16]
Viruses are an important natural means of
last universal common ancestor of life on Earth.[55] Viruses are still one of the largest reservoirs of unexplored genetic diversity on Earth.[16]
Viruses normally range in length from about 20 to 300 nanometers. This can be contrasted with the length of bacteria, which starts at about 400 nanometers. There are also giant viruses, often called giruses, typically about 1000 nanometers (one micron) in length.
All giant viruses belongto phylumNucleocytoviricota (NCLDV), together with poxviruses.
The largest known of these is Tupanvirus. This genus of giant virus was discovered in 2018 in the deep ocean as well as a soda lake, and can reach up to 2.3 microns in total length.[56]
The discovery and subsequent characterization of giant viruses has triggered some debate concerning their evolutionary origins.[57] The two main hypotheses for their origin are that either they evolved from small viruses, picking up DNA from host organisms, or that they evolved from very complicated organisms into the current form which is not self-sufficient for reproduction.[58] What sort of complicated organism giant viruses might have diverged from is also a topic of debate. One proposal is that the origin point actually represents a fourth domain of life,[59][60] but this has been largely discounted.[61][62]
Pelagibacter ubique, the most abundant bacteria in the ocean, plays a major role in the global carbon cycle
.
estuaries
and along coastal areasElectron micrograph showing a species of the widespread cyanobacteria Synechococcus. Carboxysomes appear as polyhedral dark structures.
scientific classification changed after the discovery in the 1990s that prokaryotes consist of two very different groups of organisms that evolved from an ancient common ancestor. These evolutionary domains are called Bacteria and Archaea.[64]
The ancestors of modern bacteria were unicellular microorganisms that were the first forms of life to appear on Earth, about 4 billion years ago. For about 3 billion years, most organisms were microscopic, and bacteria and archaea were the dominant forms of life.[65][66] Although bacterial fossils exist, such as stromatolites, their lack of distinctive morphology prevents them from being used to examine the history of bacterial evolution, or to date the time of origin of a particular bacterial species. However, gene sequences can be used to reconstruct the bacterial phylogeny, and these studies indicate that bacteria diverged first from the archaeal/eukaryotic lineage.[67]
Bacteria were also involved in the second great evolutionary divergence, that of the archaea and eukaryotes. Here, eukaryotes resulted from the entering of ancient bacteria into
The bacterium Marinomonas arctica grows inside Arctic sea ice at subzero temperatures
Pelagibacter ubique and its relatives may be the most abundant organisms in the ocean, and it has been claimed that they are possibly the most abundant bacteria in the world. They make up about 25% of all microbial plankton cells, and in the summer they may account for approximately half the cells present in temperate ocean surface water. The total abundance of P. ubique and relatives is estimated to be about 2 × 1028 microbes.[73] However, it was reported in Nature in February 2013 that the bacteriophageHTVC010P, which attacks P. ubique, has been discovered and "it probably really is the commonest organism on the planet".[74][75]
The largest known bacterium, the marine Thiomargarita namibiensis, can be visible to the naked eye and sometimes attains 0.75 mm (750 μm).[76][77]
Marine archaea
Archaea were initially viewed as extremophiles living in harsh environments, such as the yellow archaea pictured here in a hot spring, but they have since been found in a much broader range of habitats.[78]
Eukaryota. The Archaea are further divided into multiple recognized phyla. Classification is difficult because the majority have not been isolated in the laboratory and have only been detected by analysis of their nucleic acids
in samples from their environment.
Archaea and bacteria are generally similar in size and shape, although a few archaea have very strange shapes, such as the flat and square-shaped cells of
binary fission, fragmentation, or budding; unlike bacteria and eukaryotes, no known species forms spores
.
Archaea are particularly numerous in the oceans, and the archaea in plankton may be one of the most abundant groups of organisms on the planet. Archaea are a major part of Earth's life and may play roles in both the carbon cycle and the nitrogen cycle. Thermoproteota (also known as eocytes or Crenarchaeota) are a phylum of archaea thought to be very abundant in marine environments and one of the main contributors to the fixation of carbon.[82]
Eocytes
may be the most abundant of marine archaea
Halobacteria
, found in water nearly saturated with salt, are now recognised as archaea.
All living organisms can be grouped as either prokaryotes or eukaryotes. Life originated as single-celled prokaryotes and later evolved into the more complex eukaryotes. In contrast to prokaryotic cells, eukaryotic cells are highly organised. Prokaryotes are the bacteria and archaea, while eukaryotes are the other life forms — protists, plants, fungi and animals. Protists are usually single-celled, while plants, fungi and animals are usually multi-celled.
It seems very plausible that the root of the eukaryotes lie within archaea; the closest relatives nowadays known may be the
Heimdallarchaeota phylum of the proposed Asgard superphylum. This theory is a modern version of a scenario originally proposed in 1984 as Eocyte hypothesis, when Thermoproteota
were the closest known archaeal relatives of eukaryotes then.
A possible
transitional form of microorganism between a prokaryote and a eukaryote was discovered in 2012 by Japanese scientists. Parakaryon myojinensis is a unique microorganism larger than a typical prokaryote, but with nuclear material enclosed in a membrane as in a eukaryote, and the presence of endosymbionts. This is seen to be the first plausible evolutionary form of microorganism, showing a stage of development from the prokaryote to the eukaryote.[83][84]
Protists can be broadly divided into four groups depending on whether their nutrition is plant-like, animal-like, fungal-like,[85] or a mixture of these.[86]
In contrast to the cells of prokaryotes, the cells of eukaryotes are highly organised. Plants, animals and fungi are usually
macroscopic. Most protists are single-celled and microscopic. But there are exceptions. Some single-celled marine protists are macroscopic. Some marine slime molds have unique life cycles that involve switching between unicellular, colonial, and multicellular forms.[95] Other marine protist are neither single-celled nor microscopic, such as seaweed
, is not a true plant, yet it is multicellular and can grow to 50m
Protists have been described as a taxonomic grab bag of misfits where anything that doesn't fit into one of the main biological kingdoms can be placed.[98] Some modern authors prefer to exclude multicellular organisms from the traditional definition of a protist, restricting protists to unicellular organisms.[99][100] This more constrained definition excludes many brown, multicellular red and green algae, and slime molds.[101]
A flagellum (Latin for whip) is a lash-like appendage that protrudes from the cell body of some protists (as well as some bacteria). Flagellates use from one to several flagella for locomotion and sometimes as feeding and sensory organelle.
A cilium (Latin for eyelash) is a tiny flagellum. Ciliates use multiple cilia, which can number in many hundreds, to power themselves through the water.
Flagellates include bacteria as well as protists. The rotary motor model used by bacteria uses the protons of an electrochemical gradient in order to move their flagella. Torque in the flagella of bacteria is created by particles that conduct protons around the base of the flagellum. The direction of rotation of the flagella in bacteria comes from the occupancy of the proton channels along the perimeter of the flagellar motor.[107]
Ciliates generally have hundreds to thousands of cilia that are densely packed together in arrays. During movement, an individual cilium deforms using a high-friction power stroke followed by a low-friction recovery stroke. Since there are multiple cilia packed together on an individual organism, they display collective behavior in a metachronal rhythm. This means the deformation of one cilium is in phase with the deformation of its neighbor, causing deformation waves that propagate along the surface of the organism. These propagating waves of cilia are what allow the organism to use the cilia in a coordinated manner to move. A typical example of a ciliated microorganism is the Paramecium, a one-celled, ciliated protozoan covered by thousands of cilia. The cilia beating together allow the Paramecium to propel through the water at speeds of 500 micrometers per second.[108]
hydrothermal areas of the ocean.[112] A diverse range of unusual secondary metabolites is produced by marine fungi.[113]
nutrient cycling.[117] While mostly microscopic, some mycoplankton can be up to 20 mm in diameter and over 50 mm in length.[118]
A typical milliliter of seawater contains about 103 to 104 fungal cells.[119] This number is greater in coastal ecosystems and estuaries due to nutritional runoff from terrestrial communities. A higher diversity of mycoplankton is found around coasts and in surface waters down to 1000 metres, with a vertical profile that depends on how abundant phytoplankton is.[120][121] This profile changes between seasons due to changes in nutrient availability.[122] Marine fungi survive in a constant oxygen deficient environment, and therefore depend on oxygen diffusion by turbulence and oxygen generated by photosynthetic organisms.[123]
ascomycete, and an alga or a cyanobacterium. Several lichens are found in marine environments.[124] Many more occur in the splash zone, where they occupy different vertical zones depending on how tolerant they are to submersion.[125] Some lichens live a long time; one species has been dated at 8,600 years.[126] However their lifespan is difficult to measure because what defines the same lichen is not precise.[127] Lichens grow by vegetatively breaking off a piece, which may or may not be defined as the same lichen, and two lichens of different ages can merge, raising the issue of whether it is the same lichen.[127]
The sea snailLittoraria irrorata damages plants of Spartina in the sea marshes where it lives, which enables spores of intertidal ascomycetous fungi to colonise the plant. The snail then eats the fungal growth in preference to the grass itself.[128]
According to fossil records, fungi date back to the late Proterozoic era 900-570 million years ago. Fossil marine lichens 600 million years old have been discovered in China.[129] It has been hypothesized that mycoplankton evolved from terrestrial fungi, likely in the Paleozoic era (390 million years ago).[130]
Rotifers, usually 0.1–0.5 mm long, may look like protists but are multicellular and belong to the Animalia
Tardigrades (water bears), about 0.5 mm long, are among the most resilient animals known
Primary producers
Composite image showing the global distribution of photosynthesis, including both oceanic phytoplankton and terrestrial vegetation. Dark red and blue-green indicate regions of high photosynthetic activity in the ocean and on land, respectively.
cold seeps and using chemosynthesis. However most marine primary production comes from organisms which use photosynthesis on the carbon dioxide dissolved in the water. This process uses energy from sunlight to convert water and carbon dioxide[133]: 186–187 into sugars that can be used both as a source of chemical energy and of organic molecules that are used in the structural components of cells.[133]: 1242 Marine primary producers are important because they underpin almost all marine animal life by generating most of the oxygen
and food that provide other organisms with the chemical energy they need to exist.
The principal marine primary producers are cyanobacteria, algae and marine plants. The oxygen released as a by-product of photosynthesis is needed by nearly all living things to carry out cellular respiration. In addition, primary producers are influential in the global carbon and water cycles. They stabilize coastal areas and can provide habitats for marine animals. The term division has been traditionally used instead of phylum when discussing primary producers, but the International Code of Nomenclature for algae, fungi, and plants now accepts both terms as equivalents.[134]
Cyanobacteria
Cyanobacteria
Cyanobacteria from a microbial mat. Cyanobacteria were the first organisms to release oxygen via photosynthesis
The tiny cyanobacterium Prochlorococcus is a major contributor to atmospheric oxygen
NASA image of a large bloom of Nodularia cyanobacteria swirling in the Baltic Sea[135]
Cyanobacteria were the first organisms to evolve an ability to turn sunlight into chemical energy. They form a phylum (division) of bacteria which range from unicellular to filamentous and include colonial species. They are found almost everywhere on earth: in damp soil, in both freshwater and marine environments, and even on Antarctic rocks.[136] In particular, some species occur as drifting cells floating in the ocean, and as such were amongst the first of the phytoplankton.
The first primary producers that used photosynthesis were oceanic
dramatic change which redirected the evolution of the major animal and plant species.[139]
The tiny (0.6
µm) marine cyanobacterium Prochlorococcus, discovered in 1986, forms today an important part of the base of the ocean food chain and accounts for much of the photosynthesis of the open ocean[140] and an estimated 20% of the oxygen in the Earth's atmosphere.[141] It is possibly the most plentiful genus on Earth: a single millilitre of surface seawater may contain 100,000 cells or more.[142]
Originally, biologists thought
prokaryotes, and hence cyanobacteria from the definition of algae.[143][144]
Dinoflagellates and diatoms are important components of marine algae and have their own sections below.
Euglenophytes
are a phylum of unicellular flagellates with only a few marine members.
Not all algae are microscopic. Green, red and brown algae all have multicellular macroscopic forms that make up the familiar
multicellular and including many seaweeds such as kelp
.
Unlike higher plants, algae lack roots, stems, or leaves. They can be classified by size as
macroalgae
.
multicellular. Microalgae are important components of the marine protists discussed above, as well as the phytoplankton discussed below. They are very diverse. It has been estimated there are 200,000-800,000 species of which about 50,000 species have been described.[149]
Depending on the species, their sizes range from a few micrometers (µm) to a few hundred micrometers. They are specially adapted to an environment dominated by viscous forces.
Unicellular organisms are usually microscopic. There are exceptions.
Mermaid's wineglass, a genus of subtropical green algae, is single-celled but remarkably large and complex in form with a single large nucleus, making it a model organism for studying cell biology.[150] Another single-celled algae, Caulerpa taxifolia, has the appearance of a vascular plant including "leaves" arranged neatly up stalks like a fern. Selective breeding in aquariums to produce hardier strains resulted in an accidental release into the Mediterranean where it has become an invasive species known colloquially as killer algae.[151]
Chlamydomonas globosa, a unicellular green alga with two
multicellular and more visible types of algae, commonly called seaweeds. Seaweeds usually grow in shallow coastal waters where they are anchored to the seafloor by a holdfast. Like microalgae, macroalgae (seaweeds) can be regarded as marine protists
since they are not true plants. But they are not microorganisms, so they are not within the scope of this article.
Marine microplankton
Plankton are drifting or floating organisms that cannot swim effectively against a current, and include organisms from most areas of life: bacteria, archaea, algae, protozoa and animals.Red, orange, yellow and green represent areas where algal blooms abound. Blue areas represent nutrient-poor zones where phytoplankton exist in lower concentrations.
Plankton (from Greek for wanderers) are a diverse group of organisms that live in the water column of large bodies of water but cannot swim against a current. As a result, they wander or drift with the currents.[153] Plankton are defined by their ecological niche, not by any phylogenetic or taxonomic classification. They are a crucial source of food for many marine animals, from forage fish to whales. Plankton can be divided into a plant-like component and an animal component.
Phytoplankton
Phytoplankton – such as this colony of Chaetoceros socialis – naturally gives off red fluorescent light which dissipates excess solar energy they cannot consume through photosynthesis. This glow can be detected by satellites as an indicator of how efficiently ocean phytoplankton is photosynthesising.[154][155]
autotrophic
(self-feeding), meaning they generate their own food and do not need to consume other organisms.
Phytoplankton perform three crucial functions: they generate nearly half of the world atmospheric oxygen, they regulate ocean and atmospheric carbon dioxide levels, and they form the base of the marine
r-strategists which grow rapidly and can double their population every day. The blooms can become toxic and deplete the water of oxygen. However, phytoplankton numbers are usually kept in check by the phytoplankton exhausting available nutrients and by grazing zooplankton.[156]
Phytoplankton consist mainly of microscopic photosynthetic
silicoflagellates. They form the base of the primary production that drives the ocean food web, and account for half of the current global primary production, more than the terrestrial forests.[158]
Phytoplankton
Phytoplankton are the foundation of the ocean food chain
Diatoms form a (disputed) phylum containing about 100,000 recognised species of mainly unicellular algae. Diatoms generate about 20 per cent of the oxygen produced on the planet each year,[93] take in over 6.7 billion metric tons of silicon each year from the waters in which they live,[159] and contribute nearly half of the organic material found in the oceans.
Diatoms are one of the most common types of phytoplankton
Their protective shells (frustles) are made of silicon
) with radial (centric) or bilateral (pennate) symmetry
Diatoms are enclosed in protective silica (glass) shells called frustules. Each frustule is made from two interlocking parts covered with tiny holes through which the diatom exchanges nutrients and wastes.[156] The frustules of dead diatoms drift to the ocean floor where, over millions of years, they can build up as much as half a mile deep.[160]
Silicified frustule of a pennate diatom with two overlapping halves
Guinardia delicatula, a diatom responsible for algal blooms in the North Sea and the English Channel[161]
Fossil diatom
There are over 100,000 species of diatoms which account for 50% of the ocean's primary production
Coccolithophores are minute unicellular photosynthetic protists with two flagella for locomotion. Most of them are protected by a shell covered with ornate circular plates or scales called coccoliths. The coccoliths are made from calcium carbonate. The calcite shells are important to the marine carbon cycle.[163] The term coccolithophore derives from the Greek for a seed carrying stone, referring to their small size and the coccolith stones they carry. Under the right conditions they bloom, like other phytoplankton, and can turn the ocean milky white.[164]
of Emiliania huxleyi off the southern coast of England
Extinct fossil
Microbial rhodopsin
Model of the energy generating mechanism in marine bacteria
(1) When sunlight strikes a rhodopsin molecule (2) it changes its configuration so a proton is expelled from the cell (3) the chemical potential causes the proton to flow back to the cell (4) thus generating energy (5) in the form of adenosine triphosphate.[165]
Phototrophic metabolism relies on one of three energy-converting pigments: chlorophyll, bacteriochlorophyll, and retinal. Retinal is the chromophore found in rhodopsins. The significance of chlorophyll in converting light energy has been written about for decades, but phototrophy based on retinal pigments is just beginning to be studied.[166]
In 2000 a team of microbiologists led by Edward DeLong made a crucial discovery in the understanding of the marine carbon and energy cycles. They discovered a gene in several species of bacteria[168][169] responsible for production of the protein rhodopsin, previously unheard of in bacteria. These proteins found in the cell membranes are capable of converting light energy to biochemical energy due to a change in configuration of the rhodopsin molecule as sunlight strikes it, causing the pumping of a proton from inside out and a subsequent inflow that generates the energy.[170] The archaeal-like rhodopsins have subsequently been found among different taxa, protists as well as in bacteria and archaea, though they are rare in complex multicellular organisms.[171][172][173]
Research in 2019 shows these "sun-snatching bacteria" are more widespread than previously thought and could change how oceans are affected by global warming. "The findings break from the traditional interpretation of marine ecology found in textbooks, which states that nearly all sunlight in the ocean is captured by chlorophyll in algae. Instead, rhodopsin-equipped bacteria function like hybrid cars, powered by organic matter when available — as most bacteria are — and by sunlight when nutrients are scarce."[174][166]
There is an astrobiological conjecture called the Purple Earth hypothesis which surmises that original life forms on Earth were retinal-based rather than chlorophyll-based, which would have made the Earth appear purple instead of green.[175][176]
Redfield and f- ratios
During the 1930s Alfred C. Redfield found similarities between the composition of elements in phytoplankton and the major dissolved nutrients in the deep ocean.[177] Redfield proposed that the ratio of carbon to nitrogen to phosphorus (106:16:1) in the ocean was controlled by the phytoplankton's requirements, as phytoplankton subsequently release nitrogen and phosphorus as they remineralize. This ratio has become known as the Redfield ratio, and is used as a fundamental principle in describing the stoichiometry of seawater and phytoplankton evolution.[178]
However, the Redfield ratio is not a universal value and can change with things like geographical latitude.[179] Based on allocation of resources, phytoplankton can be classified into three different growth strategies: survivalist, bloomer and generalist. Survivalist phytoplankton has a high N:P ratio (>30) and contains an abundance of resource-acquisition machinery to sustain growth under scarce resources. Bloomer phytoplankton has a low N:P ratio (<10), contains a high proportion of growth machinery and is adapted to exponential growth. Generalist phytoplankton has similar N:P to the Redfield ratio and contain relatively equal resource-acquisition and growth machinery.[178]
The f-ratio is the fraction of total primary production fuelled by nitrate (as opposed to that fuelled by other nitrogencompounds such as ammonium). The ratio was originally defined by Richard Eppley and Bruce Peterson in one of the first papers estimating global oceanic production.[180]
Zooplankton
heterotrophic
(other-feeding), meaning they cannot produce their own food and must consume instead other plants or animals as food. In particular, this means they eat phytoplankton.
Zooplankton are generally larger than phytoplankton, mostly still microscopic but some can be seen with the naked eye. Many
Like radiolarians, foraminiferans (forams for short) are single-celled predatory protists, also protected with shells that have holes in them. Their name comes from the Latin for "hole bearers". Their shells, often called tests, are chambered (forams add more chambers as they grow). The shells are usually made of calcite, but are sometimes made of agglutinated sediment particles or chiton, and (rarely) of silica. Most forams are benthic, but about 40 species are planktic.[187] They are widely researched with well established fossil records which allow scientists to infer a lot about past environments and climates.[185]
Foraminiferans
...can have more than one nucleus
...and defensive spines
Foraminiferans are important unicellular zooplankton protists, with calcium tests
heterotrophy at the other. It is estimated that mixotrophs comprise more than half of all microscopic plankton.[192] There are two types of eukaryotic mixotrophs: those with their own chloroplasts, and those with endosymbionts—and others that acquire them through kleptoplasty or by enslaving the entire phototrophic cell.[193]
The distinction between plants and animals often breaks down in very small organisms. Possible combinations are photo- and chemotrophy, litho- and organotrophy, auto- and heterotrophy or other combinations of these. Mixotrophs can be either eukaryotic or prokaryotic.[194] They can take advantage of different environmental conditions.[195]
Recent studies of marine microzooplankton found 30–45% of the ciliate abundance was mixotrophic, and up to 65% of the amoeboid, foram and radiolarian biomass was mixotrophic.[87]
Phaeocystis is an important algal genus found as part of the marine phytoplankton around the world. It has a polymorphic life cycle, ranging from free-living cells to large colonies.[196] It has the ability to form floating colonies, where hundreds of cells are embedded in a gel matrix, which can increase massively in size during blooms.[197] As a result, Phaeocystis is an important contributor to the marine carbon[198] and sulfur cycles.[199]Phaeocystis species are endosymbionts to acantharian radiolarians.[200][201]
Mixotrophic plankton that combine phototrophy and heterotrophy – table based on Stoecker et al., 2017[202]
Called constitutive mixotrophs by Mitra et al., 2016.[203] Phytoplankton that eat: photosynthetic protists with inherited plastids and the capacity to ingest prey.
Called nonconstitutive mixotrophs by Mitra et al., 2016.[203] Zooplankton that are photosynthetic: microzooplankton or metazoan zooplankton that acquire phototrophy through chloroplast retentiona or maintenance of algal endosymbionts.
Generalists
Protists that retain chloroplasts and rarely other organelles from many algal taxa
Traditionally dinoflagellates have been presented as armoured or unarmoured
Dinoflagellates often live in
nassellarian radiolarians house dinoflagellatesymbionts within their tests.[207] The nassellarian provides ammonium and carbon dioxide for the dinoflagellate, while the dinoflagellate provides the nassellarian with a mucous membrane useful for hunting and protection against harmful invaders.[208] There is evidence from DNA analysis that dinoflagellate symbiosis with radiolarians evolved independently from other dinoflagellate symbioses, such as with foraminifera.[209]
Some dinoflagellates are
cytoplasmic bodies which contain dinoflagellate luciferase, the main enzyme involved in the luminescence. The luminescence, sometimes called the phosphorescence of the sea, occurs as brief (0.1 sec) blue flashes or sparks when individual scintillons are stimulated, usually by mechanical disturbances from, for example, a boat or a swimmer or surf.[212]
calpionellids, which are extinct, was used to date this dagger.[216]
Further information:
protist shells
Sediments at the bottom of the ocean have two main origins, terrigenous and biogenous.
Terrigenous sediments account for about 45% of the total marine sediment, and originate in the erosion of rocks on land, transported by rivers and land runoff, windborne dust, volcanoes, or grinding by glaciers.
Biogenous sediments account for the other 55% of the total sediment, and originate in the skeletal remains of marine protists (single-celled plankton and benthos microorganisms). Much smaller amounts of precipitated minerals and meteoric dust can also be present. Ooze, in the context of a marine sediment, does not refer to the consistency of the sediment but to its biological origin. The term ooze was originally used by John Murray, the "father of modern oceanography", who proposed the term radiolarian ooze for the silica deposits of radiolarian shells brought to the surface during the Challenger expedition.[217] A biogenic ooze is a pelagic sediment
containing at least 30 per cent from the skeletal remains of marine organisms.
Distribution of sediment types on the seafloor Within each colored area, the type of material shown is what dominates, although other materials are also likely to be present. For further information, see here
Marine microbenthos
Archaea rock – this deep ocean rock harboured worms that consumed methane-eating archaea
Marine microbenthos are microorganisms that live in the benthic zone of the ocean – that live near or on the seafloor, or within or on surface seafloor sediments. The word benthos comes from Greek, meaning "depth of the sea". Microbenthos are found everywhere on or about the seafloor of continental shelves, as well as in deeper waters, with greater diversity in or on seafloor sediments. In shallow waters, seagrass meadows, coral reefs and kelp forests provide particularly rich habitats. In photic zones benthic diatoms dominate as photosynthetic organisms. In intertidal zones changing tides strongly control opportunities for microbenthos.
Elphidium a widespread abundant genus of benthic forams
oxygen isotopes in the shells, since lighter isotopes evaporate more readily in warmer water leaving the heavier isotopes in the shells. Information about past climates can be inferred further from the abundance of forams and diatoms, since they tend to be more abundant in warm water.[223]
The sudden extinction event which killed the dinosaurs 66 million years ago also rendered extinct three-quarters of all other animal and plant species. However, deep-sea benthic forams flourished in the aftermath. In 2020 it was reported that researchers have examined the chemical composition of thousands of samples of these benthic forams and used their findings to build the most detailed climate record of Earth ever.[224][225]
Some endoliths have extremely long lives. In 2013 researchers reported evidence of endoliths in the ocean floor, perhaps millions of years old, with a generation time of 10,000 years.[226] These are slowly metabolizing and not in a dormant state. Some Actinomycetota found in Siberia are estimated to be half a million years old.[227][228][229]
Marine microbiomes
Main article:
Marine microbiomes
Symbiosis and holobionts
Main types of microbial symbioses
(A) Microbial interactions range from mutually beneficial to harmful for one or more partners. Blue double headed arrows highlight that relationships can move between classifications often influenced by environmental conditions. (B) Host-microbe symbioses should be considered within the context of microbial communities where the host participates in multiple and often different symbiotic relationships. (C) Microbial communities are influenced by a variety of microbe-microbe symbioses ranging from cooperation (e.g., syntrophy or co-metabolism) to competition. Arrows depict generally beneficial (blue) and detrimental (red) outcomes for one (single arrowhead) or both (double arrowhead) members. Note as with host-microbe symbioses these relationships can be viewed as fluid and influenced by environmental conditions.[230]
The concept of the holobiont was initially defined by Dr. Lynn Margulis in her 1991 book Symbiosis as a Source of Evolutionary Innovation as an assemblage of a host and the many other species living in or around it, which together form a discrete ecological unit.[231] The components of a holobiont are individual species or bionts, while the combined genome of all bionts is the hologenome.[232]
The concept has subsequently evolved since this original definition,[233] with the focus moving to the microbial species associated with the host. Thus the holobiont includes the host, virome, microbiome, and other members, all of which contribute in some way to the function of the whole.[234][235] A holobiont typically includes a eukaryotehost and all of the symbioticviruses, bacteria, fungi, etc. that live on or inside it.[236]
However, there is controversy over whether holobionts can be viewed as single evolutionary units.[237]
Marine microorganisms play central roles in the marine food web.
The
dissolved organic matter (DOM), which can be readily taken up by microorganisms.[244] Viral shunting helps maintain diversity within the microbial ecosystem by preventing a single species of marine microbe from dominating the micro-environment.[245] The DOM recycled by the viral shunt pathway is comparable to the amount generated by the other main sources of marine DOM.[246]
Sea ice microbial communities (SIMCO) refer to groups of microorganisms living within and at the interfaces of sea ice at the poles. The ice matrix they inhabit has strong vertical gradients of salinity, light, temperature and nutrients. Sea ice chemistry is most influenced by the salinity of the brine which affects the pH and the concentration of dissolved nutrients and gases. The brine formed during the melting sea ice creates pores and channels in the sea ice in which these microbes can live. As a result of these gradients and dynamic conditions, a higher abundance of microbes are found in the lower layer of the ice, although some are found in the middle and upper layers.[251]
black smokers which emit water darkened by accumulated precipitates of sulfide at hot temperatures, about 300-400 °C.[252]
Chemolithoautotrophic bacteria can derive nutrients and energy from the geological activity at a hydrothermal vent to fix carbon into organic forms.[254]
deep-sea hydrothermal viruses affect abundance and diversity of prokaryotes and therefore impact microbial biogeochemical cycling by lysing their hosts to replicate.[260] However, in contrast to their role as a source of mortality and population control, viruses have also been postulated to enhance survival of prokaryotes in extreme environments, acting as reservoirs of genetic information. The interactions of the virosphere with microorganisms under environmental stresses is therefore thought to aide microorganism survival through dispersal of host genes through horizontal gene transfer.[261]
Deep biosphere and dark matter
Fluorescence microscopy of various picoplankton in the ocean, much of which cannot be effectively studied because they resist attempts at laboratory culture
See also:
marine cryptic interactions
The deep biosphere is that part of the biosphere that resides below the first few meters of the surface. It extends at least 5 kilometers below the continental surface and 10.5 kilometers below the sea surface, with temperatures that may exceed 100 °C.
Above the surface living organisms consume organic matter and oxygen. Lower down, these are not available, so they make use of "edibles" (electron donors) such as hydrogen released from rocks by various chemical processes, methane, reduced sulfur compounds and ammonium. They "breathe" electron acceptors such as nitrates and nitrites, manganese and iron oxides, oxidized sulfur compounds and carbon dioxide.
There is very little energy at greater depths, and metabolism can be up to a million times slower than at the surface. Cells may live for thousands of years before dividing and there is no known limit to their age. The subsurface accounts for about 90% of the biomass in bacteria and archaea, and 15% of the total biomass for the biosphere. Eukaryotes are also found, mostly microscopic, but including some multicellular life. Viruses are also present and infect the microbes.
Subsurface life environments
In 2018, researchers from the
breathing sulfur and eating rocks such as pyrite as their regular food source.[265][266][267] This discovery occurred in the oldest known water on Earth.[268]
These aerobic microorganisms, found deep in organically poor sediments, have been in quasi-suspended animation for maybe 100 million years
ecological niche is culturable. In recent years effort is being put to decipher more of the microbial dark matter by means of learning their genomeDNA sequence from environmental samples[273]
and then by gaining insights to their metabolism from their sequenced genome, promoting the knowledge required for their cultivation.
Microbial diversity
Estimates of microbial species counts in the three domains of life
Bacteria are the oldest and most biodiverse group, followed by Archaea and Fungi (the most recent groups). In 1998, before awareness of the extent of microbial life had gotten underway,
Robert M. May[274] estimated there were 3 million species of living organisms on the planet. But in 2016, Locey and Lennon[275] estimated the number of microorganism species could be as high as 1 trillion.[276]
Microbial diversity
Comparative representation of the known and estimated (small box) and the yet unknown (large box) microbial diversity, which applies to both marine and terrestrial microorganisms. The text boxes refer to factors that adversely affect the knowledge of the microbial diversity that exists on the planet.[276]
Sampling techniques
See also:
continuous plankton recorder
Strategies for sampling plankton by size classes and abundance The blue background indicates the filtered volume required to obtain sufficient organism numbers for analysis. Actual volumes from which organisms are sampled are always recorded.[277]
Identifying microorganisms
High volumes of plankton samples can be analysed rapidly using modern imaging techniques.[277]
plants, particularly hampered early efforts at classifying bacteria and archaea. This resulted in erroneous, distorted and confused classification, an example of which, noted Carl Woese, is Pseudomonas whose etymology ironically matched its taxonomy, namely "false unit".[279]
Many bacterial taxa have been reclassified or redefined using molecular phylogenetics.
Barcoding
Pelagibacter ubique, the most common bacterium in the ocean
Marinomonas arctica, a bacterium which grows inside Arctic sea ice at subzero temperatures
It would be difficult to consistently separate out these two microbes using images alone. However, if their barcodes are aligned to each other and their bases are coloured to see them more clearly, it becomes easy to see which bases are different between these two microbes. In this manner, millions of different kinds of microbes can be distinguished.[280]
DNA barcode alignment and comparison between the two species of marine bacteria pictured above[280]
Methods used to study phytoplankton
Three different possibilities to process the sample are using raw samples, fixation or preservation, and filtration. For microscopy and flow cytometry raw samples either are measured immediately or have to be fixed for later measurements. Since molecular methods, pigment analysis and detection of molecular tracers usually require concentrated cells, filter residues serve for phytoplankton measurements. Molecular characterization and quantification of trace molecules is performed using chromatography, mass spectrometry, and nuclear magnetic resonance spectroscopy.[281]
The new sequencing technologies and the accumulation of sequence data have resulted in a paradigm shift, highlighted both the ubiquity of microbial communities in association within higher organisms and the critical roles of microbes in ecosystem health.[283] These new possibilities have revolutionized microbial ecology, because the analysis of genomes and metagenomes in a high-throughput manner provides efficient methods for addressing the functional potential of individual microorganisms as well as of whole communities in their natural habitats.[284][285][286]
Using omics data
DNA sequencing technologies used in marine metagenomics
The discovery process involves marine sampling, DNA sequencing and contig generation. Previously unknown genes, pathways and even whole genomes are being discovered. These genome-editing technologies are used to retrieve and modify valuable microorganisms for production, particularly in marine metagenomics. Organisms may be cultivable or uncultivable. Metagenomics is providing especially valuable information for uncultivable samples.[287]
Omics is a term used informally to refer to branches of biology whose names end in the suffix -omics, such as genomics, proteomics, metabolomics, and glycomics. Marine Omics has recently emerged as a field of research of its own.[288] Omics aims at collectively characterising and quantifying pools of biological molecules that translate into the structure, function, and dynamics of an organism or organisms. For example, functional genomics aims at identifying the functions of as many genes as possible of a given organism. It combines different
-omics techniques such as transcriptomics and proteomics with saturated mutant collections.[289][290]
Many omes beyond the original
proteins
on a large scale.
Any given omics technique, used just by itself, cannot adequately disentangle the intricacies of a host
Meta-omics data based biogeochemical modeling [293]
A schematic conceptual framework for marine biogeochemical modeling from environmental, imaging, and meta-omics data.[294] A semi-automatic computational pipeline is schematized for combining biomarkers with biogeochemical data [295] that can be incorporated into classic biogeochemical models [296] for creating a next generation of biogeochemical trait-based meta-omics models by considering their respective traits. Such novel meta-omics-enabled approaches aim to improve the monitoring and prediction of ocean processes while respecting the complexity of the planktonic system.[297][298]
Microorganisms and climate change in marine and terrestrial biomes[6]
In marine environments, microbial primary production contributes substantially to CO2 sequestration. Marine microorganisms also recycle nutrients for use in the marine food web and in the process release CO2 to the atmosphere. Microbial biomass and other organic matter (remnants of plants and animals) are converted to fossil fuels over millions of years. By contrast, burning of fossil fuels liberates greenhouse gases in a small fraction of that time. As a result, the carbon cycle is out of balance, and atmospheric CO2 levels will continue to rise as long as fossil fuels continue to be burnt.[6]
Microorganisms have key roles in carbon and nutrient cycling, animal (including human) and plant health, agriculture and the global food web. Microorganisms live in all environments on Earth that are occupied by macroscopic organisms, and they are the sole life forms in other environments, such as the deep subsurface and ‘extreme’ environments. Microorganisms date back to the origin of life on Earth at least 3.8 billion years ago, and they will likely exist well beyond any future extinction events... Unless we appreciate the importance of microbial processes, we fundamentally limit our understanding of Earth's biosphere and response to climate change and thus jeopardize efforts to create an environmentally sustainable future.[6]
History
Marine microorganisms known as cyanobacteria first emerged in the oceans during the Precambrian era roughly 2 billion years ago. Over eons, the photosynthesis of marine microorganisms generated by oxygen has helped shape the chemical environment in the evolution of plants, animals and many other life forms. Marine microorganisms were first observed in 1675 by Dutch lensmaker Antonie van Leeuwenhoek.
^ abRybicki EP (1990). "The classification of organisms at the edge of life, or problems with virus systematics". South African Journal of Science. 86: 182–186.
^ abSridhar, K.R. (2009). "10. Aquatic fungi – Are they planktonic?". Plankton Dynamics of Indian Waters. Jaipur, India: Pratiksha Publications. pp. 133–148.
^Starckx, Senne (31 October 2012). "A place in the sun". Flanders Today. Archived from the original on 4 March 2016. Retrieved 8 December 2012. Algae is the crop of the future, according to researchers in Geel
^Robinson, Carol, and Nagappa Ramaiah. "Microbial heterotrophic metabolic rates constrain the microbial carbon pump." The American Association for the Advancement of Science, 2011.
^ abCollins, R. Eric (2019) The Small and Mighty – Microbial LifeNOAA: Ocean Exploration and Research, Gulf of Alaska Seamounts 2019 Expedition. This article incorporates text from this source, which is in the public domain.
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The marine Thiomargarita namibiensis, largest known bacterium
![The chloroplasts of glaucophytes have a peptidoglycan layer, evidence suggesting their endosymbiotic origin from cyanobacteria.[72]](//upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Glaucocystis_sp.jpg/280px-Glaucocystis_sp.jpg)
Theendosymbiotic origin from cyanobacteria.[72]
The bacterium Marinomonas arctica grows inside Arctic sea ice at subzero temperatures
![The chloroplasts of glaucophytes have a peptidoglycan layer, evidence suggesting their endosymbiotic origin from cyanobacteria.[72]](/File:Glaucocystis_sp.jpg)
Eocytesmay be the most abundant of marine archaea
Halobacteria, found in water nearly saturated with salt, are now recognised as archaea.
Flat, square-shaped cells of the archaea Haloquadratum walsbyi
Methanosarcina barkeri, a marine archaea that produces methane
Thermophiles, such as Pyrolobus fumarii, survive well over 100 °C
_(cropped).jpg)
![Diatoms are a major algae group generating about 20% of world oxygen production.[93]](//upload.wikimedia.org/wikipedia/commons/thumb/3/31/Diatoms_through_the_microscope.jpg/297px-Diatoms_through_the_microscope.jpg)
![Diatoms have glass like cell walls made of silica and called frustules.[94]](//upload.wikimedia.org/wikipedia/commons/thumb/9/90/Diatom_algae_Amphora_sp.jpg/260px-Diatom_algae_Amphora_sp.jpg)
Fossil diatom frustule from 32 to 40mya
Radiolarian
Single-celled alga, Gephyrocapsa oceanica
Two dinoflagellates
Euglenoid
Zooxanthellae is a photosynthetic algae that lives inside hosts like coral
A single-celledendosymbiotically
This ciliate is digesting cyanobacteria. The cytostome or mouth is at the bottom right.![Diatoms are a major algae group generating about 20% of world oxygen production.[93]](/File:Diatoms_through_the_microscope.jpg)
![Diatoms have glass like cell walls made of silica and called frustules.[94]](/File:Diatom_algae_Amphora_sp.jpg)
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How microscopic hunters get their lunch
The single-celledgiant amoeba has up to 1000 nucleiand reaches lengths of 5 mm![Gromia sphaerica is a large spherical testate amoeba which makes mud trails. Its diameter is up to 3.8 cm.[96]](//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Gromia_in_situ_closeup.png/266px-Gromia_in_situ_closeup.png)
testate amoeba which makes mud trails. Its diameter is up to 3.8 cm.[96]
foraminiferan with an appearance and lifestyle that mimics a sponge, grows to 5 cm long.![The xenophyophore, another single-celled foraminiferan, lives in abyssal zones. It has a giant shell up to 20 cm across.[97]](//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Xenophyophore.jpg/292px-Xenophyophore.jpg)
Thexenophyophore, another single-celled foraminiferan, lives in abyssal zones. It has a giant shell up to 20 cm across.[97]
Giant kelp, a brown algae, is not a true plant, yet it is multicellular and can grow to 50m
![Gromia sphaerica is a large spherical testate amoeba which makes mud trails. Its diameter is up to 3.8 cm.[96]](/File:Gromia_in_situ_closeup.png)
![The xenophyophore, another single-celled foraminiferan, lives in abyssal zones. It has a giant shell up to 20 cm across.[97]](/File:Xenophyophore.jpg)
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Bacterial flagellum rotated by a molecular motor at its base
Salmonspermatozoa
The ciliateOxytricha trifallaxwith cilia clearly visible
Amoeba with ingested diatoms
Over 10,000 marine species are copepods, small, often microscopic crustaceans
Darkfield photo of a gastrotrich, 0.06-3.0 mm long, a worm-like animal living between sediment particles
Armoured Pliciloricus enigmaticus, about 0.2 mm long, live in spaces between marine gravel
Rotifers, usually 0.1–0.5 mm long, may look like protists but are multicellular and belong to the Animalia
Tardigrades (water bears), about 0.5 mm long, are among the most resilient animals known
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Chlamydomonas globosa, a unicellular green alga with twoflagellajust visible at bottom left![Chlorella vulgaris, a common green microalgae, in endosymbiosis with a ciliate[152]](//upload.wikimedia.org/wikipedia/commons/thumb/b/b6/%D0%98%D0%BD%D1%84%D1%83%D0%B7%D0%BE%D1%80%D0%B8%D0%B8_Ophridium_versatile.jpg/338px-%D0%98%D0%BD%D1%84%D1%83%D0%B7%D0%BE%D1%80%D0%B8%D0%B8_Ophridium_versatile.jpg)
Centric diatom
Dinoflagellates
Colonial algal chains.jpg)
![Chlorella vulgaris, a common green microalgae, in endosymbiosis with a ciliate[152]](/File:%D0%98%D0%BD%D1%84%D1%83%D0%B7%D0%BE%D1%80%D0%B8%D0%B8_Ophridium_versatile.jpg)
Phytoplankton are the foundation of the ocean food chain
They come in many shapes and sizes.
Colonial phytoplankton
The cyanobacterium Prochlorococcus accounts for much of the ocean's primary production
Green cyanobacteria scum washed up on a rock in California
Diatoms are one of the most common types of phytoplankton
Their protective shells (frustles) are made of silicon
They come in many shapes and sizes_Various_diatoms.jpg)
![Guinardia delicatula, a diatom responsible for algal blooms in the North Sea and the English Channel[161]](//upload.wikimedia.org/wikipedia/commons/thumb/4/43/Fjouenne_sbrmvr012w_20070924163039_small.jpg/260px-Fjouenne_sbrmvr012w_20070924163039_small.jpg)
Guinardia delicatula, a diatom responsible for algal blooms in the North Sea and the English Channel[161]
Fossil diatom
There are over 100,000 species of diatoms which account for 50% of the ocean's primary production![Guinardia delicatula, a diatom responsible for algal blooms in the North Sea and the English Channel[161]](/File:Fjouenne_sbrmvr012w_20070924163039_small.jpg)
Coccolithophores have plates called coccoliths
Coccolithus pelagicus ssp. braarudii
Algae bloomof Emiliania huxleyi off the southern coast of England
Extinct fossil
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Like diatoms, radiolarians come in many shapes
Also like diatoms, radiolarian shells are usually made of silicate
Howeveracantharian radiolarians have shells made from strontium sulfatecrystals
Cutaway schematic diagram of a spherical radiolarian shell
Cladococcus abietinus
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section showing chambers of a spiral foram
Live Ammonia tepida streaming granular ectoplasm for catching food
Group of planktonic forams
Fossil nummulitid forams of various sizes from the Eocene![The Egyptian pyramids were constructed from limestone that contained nummulites.[188]](//upload.wikimedia.org/wikipedia/commons/thumb/a/af/All_Gizah_Pyramids.jpg/325px-All_Gizah_Pyramids.jpg)
TheEgyptian pyramids were constructed from limestone that contained nummulites.[188]
![The Egyptian pyramids were constructed from limestone that contained nummulites.[188]](/File:All_Gizah_Pyramids.jpg)
Testate amoeba, Cyphoderiasp.
Shell or test of atestate amoeba, Arcellasp.
Xenogenic testate amoeba covered in diatoms (from Penard's Amoeba Collection)
Naked amoeba, Chaos sp.
Naked amoeba showing food vacuoles and ingested diatom.jpg)
Holophyra ovum![Mesodinium rubrum produce deep red blooms using enslaved chloroplasts from their algal prey [191]](//upload.wikimedia.org/wikipedia/commons/thumb/d/df/Mesodinium_rubrum.jpg/300px-Mesodinium_rubrum.jpg)
Mesodinium rubrum produce deep red blooms using enslaved chloroplasts from their algal prey [191].jpg)
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![Mesodinium rubrum produce deep red blooms using enslaved chloroplasts from their algal prey [191]](/File:Mesodinium_rubrum.jpg)
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Tintinnid ciliate Favella
Euglena mutabilis, a photosynthetic flagellate
Zoochlorellae (green) living inside the ciliateStichotricha secunda
Gyrodinium, one of the few naked dinoflagellates which lack armour
The dinoflagellate Protoperidinium extrudes a large feeding veil to capture prey
Nassellarianradiolarians can be in symbiosis with dinoflagellates
The dinoflagellate Dinophysis acuta
_mitra_Ehrenberg_-_160x.jpg)
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Tripos muelleri is recognisable by its U-shaped horns![Oodinium, a genus of parasitic dinoflagellates, causes velvet disease in fish[213]](//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Archives_de_zoologie_exp%C3%A9rimentale_et_g%C3%A9n%C3%A9rale_%281920%29_%2820299351186%29.jpg/260px-Archives_de_zoologie_exp%C3%A9rimentale_et_g%C3%A9n%C3%A9rale_%281920%29_%2820299351186%29.jpg)
velvet disease in fish[213]![Karenia brevis produces red tides highly toxic to humans[214]](//upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Karenia_brevis.jpg/214px-Karenia_brevis.jpg)
Karenia brevis produces red tides highly toxic to humans[214]
Red tide![Noctiluca scintillans, a bioluminescent dinoflagellate[215]](//upload.wikimedia.org/wikipedia/commons/thumb/6/62/Noctiluca_scintillans_unica.jpg/196px-Noctiluca_scintillans_unica.jpg)
Noctiluca scintillans, a bioluminescent dinoflagellate[215]
![Oodinium, a genus of parasitic dinoflagellates, causes velvet disease in fish[213]](/File:Archives_de_zoologie_exp%C3%A9rimentale_et_g%C3%A9n%C3%A9rale_(1920)_(20299351186).jpg)
![Karenia brevis produces red tides highly toxic to humans[214]](/File:Karenia_brevis.jpg)
_by_Noctiluca_in_Nagasaki.jpg)
![Noctiluca scintillans, a bioluminescent dinoflagellate[215]](/File:Noctiluca_scintillans_unica.jpg)
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diatoms(click to magnify)
Calcareous microfossils from marine sediment consisting mainly of star-shaped discoaster with a sprinkling of coccoliths
Shells (tests), usually made of calcium carbonate, from a foraminiferal ooze on the deep ocean floor
Illustration of a Globigerina ooze![Marble can contain protist microfossils of foraminiferans, coccolithophores, calcareous nannoplankton and algae, ostracodes, pteropods, calpionellids and bryozoa[222]](//upload.wikimedia.org/wikipedia/commons/thumb/6/61/MarmoCipollino_FustoBasMassenzioRoma.jpg/320px-MarmoCipollino_FustoBasMassenzioRoma.jpg)
![Opal can contain protist microfossils of diatoms, radiolarians, silicoflagellates and ebridians[222]](//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Coober_Pedy_Opal_Doublet.jpg/352px-Coober_Pedy_Opal_Doublet.jpg)
Opal can contain protist microfossils of diatoms, radiolarians, silicoflagellates and ebridians[222]
![Marble can contain protist microfossils of foraminiferans, coccolithophores, calcareous nannoplankton and algae, ostracodes, pteropods, calpionellids and bryozoa[222]](/File:MarmoCipollino_FustoBasMassenzioRoma.jpg)
![Opal can contain protist microfossils of diatoms, radiolarians, silicoflagellates and ebridians[222]](/File:Coober_Pedy_Opal_Doublet.jpg)
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Distribution of sediment types on the seafloor.jpg)
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Elphidium a widespread abundant genus of benthic forams
Heterohelix, an extinct genus of benthic forams
![Coral holobiont[240]](/File:Trophic_connections_of_the_coral_holobiont_in_the_planktonic_food_web.jpg)
![Sponge holobiont[241]](/File:The_sponge_holobiont.webp)
![Seagrass holobiont[242]](/File:Processes_within_the_seagrass_holobiont.webp)
![Climate change and the rhodolith holobiont[243]](/File:Climate_change_stressors_and_rhodolith_holobiont_fitness.webp)
Pelagibacter ubique, the most abundant bacteria in the ocean, plays a major role in the global carbon cycle.![Marine snow is the shower of organic particles that falls from upper waters to the deep ocean[248] It is a major exporter of carbon.](//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Marine_snow.jpg/270px-Marine_snow.jpg)
Marine snow is the shower of organic particles that falls from upper waters to the deep ocean[248] It is a major exporter of carbon.
![Marine snow is the shower of organic particles that falls from upper waters to the deep ocean[248] It is a major exporter of carbon.](/File:Marine_snow.jpg)
![Estimates of microbial species counts in the three domains of life Bacteria are the oldest and most biodiverse group, followed by Archaea and Fungi (the most recent groups). In 1998, before awareness of the extent of microbial life had gotten underway, Robert M. May[274] estimated there were 3 million species of living organisms on the planet. But in 2016, Locey and Lennon[275] estimated the number of microorganism species could be as high as 1 trillion.[276]](//upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Microbial_species_present_in_the_three_domains_of_life.png/889px-Microbial_species_present_in_the_three_domains_of_life.png)
Estimates of microbial species counts in the three domains of lifeBacteria are the oldest and most biodiverse group, followed by Archaea and Fungi (the most recent groups). In 1998, before awareness of the extent of microbial life had gotten underway,![Microbial diversity Comparative representation of the known and estimated (small box) and the yet unknown (large box) microbial diversity, which applies to both marine and terrestrial microorganisms. The text boxes refer to factors that adversely affect the knowledge of the microbial diversity that exists on the planet.[276]](//upload.wikimedia.org/wikipedia/commons/thumb/1/16/Known%2C_estimated_and_unknown_microbial_diversity.webp/661px-Known%2C_estimated_and_unknown_microbial_diversity.webp.png)
Microbial diversityComparative representation of the known and estimated (small box) and the yet unknown (large box) microbial diversity, which applies to both marine and terrestrial microorganisms. The text boxes refer to factors that adversely affect the knowledge of the microbial diversity that exists on the planet.[276]![Estimates of microbial species counts in the three domains of life Bacteria are the oldest and most biodiverse group, followed by Archaea and Fungi (the most recent groups). In 1998, before awareness of the extent of microbial life had gotten underway, Robert M. May[274] estimated there were 3 million species of living organisms on the planet. But in 2016, Locey and Lennon[275] estimated the number of microorganism species could be as high as 1 trillion.[276]](/File:Microbial_species_present_in_the_three_domains_of_life.png)
![Microbial diversity Comparative representation of the known and estimated (small box) and the yet unknown (large box) microbial diversity, which applies to both marine and terrestrial microorganisms. The text boxes refer to factors that adversely affect the knowledge of the microbial diversity that exists on the planet.[276]](/File:Known,_estimated_and_unknown_microbial_diversity.webp)
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