Biology:Algae

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Short description: Diverse group of photosynthetic eukaryotic organisms
Biology:Algae
An informal term for a diverse group of photosynthetic eukaryotes
Temporal range: Mesoproterozoic–present[1][2]
A variety of algae growing on the sea bed in shallow waters
A variety of algae growing on the sea bed in shallow waters
A variety of microscopic unicellular and colonial freshwater algae
A variety of microscopic unicellular and colonial freshwater algae
Scientific classificationEdit this classification
Domain: Eukaryota
Groups included
Typically excluded

Algae (UK: /ˈælɡiː/, US: /ˈældʒiː/;[3] Template:Singular: alga /ˈælɡə/) is an informal term for a large and diverse group of photosynthetic, eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from unicellular microalgae, such as Chlorella, Prototheca and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to 50 metres (160 ft) in length. Most are aquatic and lack many of the distinct cell and tissue types, such as stomata, xylem and phloem that are found in land plants. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae which includes, for example, Spirogyra and stoneworts. Algae that are carried by water are plankton, specifically phytoplankton.

Algae constitute a polyphyletic group[4] since they do not include a common ancestor, and although their plastids seem to have a single origin, from cyanobacteria,[5] they were acquired in different ways. Green algae are examples of algae that have primary chloroplasts derived from endosymbiotic cyanobacteria. Diatoms and brown algae are examples of algae with secondary chloroplasts derived from an endosymbiotic red alga.[6] Algae exhibit a wide range of reproductive strategies, from simple asexual cell division to complex forms of sexual reproduction.[7]

Algae lack the various structures that characterize land plants, such as the phyllids (leaf-like structures) of bryophytes, rhizoids of non-vascular plants, and the roots, leaves, and other organs found in tracheophytes (vascular plants). Most are phototrophic, although some are mixotrophic, deriving energy both from photosynthesis and uptake of organic carbon either by osmotrophy, myzotrophy, or phagotrophy. Some unicellular species of green algae, many golden algae, euglenids, dinoflagellates, and other algae have become heterotrophs (also called colorless or apochlorotic algae), sometimes parasitic, relying entirely on external energy sources and have limited or no photosynthetic apparatus.[8][9][10] Some other heterotrophic organisms, such as the apicomplexans, are also derived from cells whose ancestors possessed plastids, but are not traditionally considered as algae. Algae have photosynthetic machinery ultimately derived from cyanobacteria that produce oxygen as a by-product of photosynthesis, unlike other photosynthetic bacteria such as purple and green sulfur bacteria. Fossilized filamentous algae from the Vindhya basin have been dated back to 1.6 to 1.7 billion years ago.[11]

Because of the wide range of types of algae, they have increasing different industrial and traditional applications in human society. Traditional seaweed farming practices have existed for thousands of years and have strong traditions in East Asia food cultures. More modern algaculture applications extend the food traditions for other applications include cattle feed, using algae for bioremediation or pollution control, transforming sunlight into algae fuels or other chemicals used in industrial processes, and in medical and scientific applications. A 2020 review found that these applications of algae could play an important role in carbon sequestration in order to mitigate climate change while providing lucrative value-added products for global economies.[12]

Etymology and study

The singular alga is the Latin word for 'seaweed' and retains that meaning in English.[13] The etymology is obscure. Although some speculate that it is related to Latin algēre, 'be cold',[14] no reason is known to associate seaweed with temperature. A more likely source is alliga, 'binding, entwining'.[15]

The Ancient Greek word for 'seaweed' was φῦκος (phŷkos), which could mean either the seaweed (probably red algae) or a red dye derived from it. The Latinization, fūcus, meant primarily the cosmetic rouge. The etymology is uncertain, but a strong candidate has long been some word related to the Biblical פוך (pūk), 'paint' (if not that word itself), a cosmetic eye-shadow used by the ancient Egyptians and other inhabitants of the eastern Mediterranean. It could be any color: black, red, green, or blue.[16]

The study of algae is most commonly called phycology (from gre phykos 'seaweed'); the term algology is falling out of use.[17]

Classifications

False-color scanning electron micrograph of the unicellular coccolithophore Gephyrocapsa oceanica

One definition of algae is that they "have chlorophyll as their primary photosynthetic pigment and lack a sterile covering of cells around their reproductive cells".[18] On the other hand, the colorless Prototheca under Chlorophyta are all devoid of any chlorophyll. Although cyanobacteria are often referred to as "blue-green algae", most authorities exclude all prokaryotes, including cyanobacteria, from the definition of algae.[4][19]

The algae contain chloroplasts that are similar in structure to cyanobacteria. Chloroplasts contain circular DNA like that in cyanobacteria and are interpreted as representing reduced endosymbiotic cyanobacteria. However, the exact origin of the chloroplasts is different among separate lineages of algae, reflecting their acquisition during different endosymbiotic events. The table below describes the composition of the three major groups of algae. Their lineage relationships are shown in the figure in the upper right. Many of these groups contain some members that are no longer photosynthetic. Some retain plastids, but not chloroplasts, while others have lost plastids entirely.[citation needed]

Phylogeny based on plastid[20] not nucleocytoplasmic genealogy:

 

Cyanobacteria

 
 
 

Glaucophytes

 
 
 
 

Rhodophytes

 
 

Stramenopiles

 
 
 

Cryptophytes

 
 

Haptophytes

 
 
with rhodoplasts
 
 

Euglenophytes

 
 
 
 

Chlorophytes

 
 
 

Charophytes

 
 

Land plants (Embryophyta)

 
 
 
 

Chlorarachniophytes

 
 
with chloroplasts
 
 
Supergroup affiliation Members Endosymbiont Summary
Primoplantae/
Archaeplastida 		Cyanobacteria These algae have "primary" chloroplasts, i.e. the chloroplasts are surrounded by two membranes and probably developed through a single endosymbiotic event. The chloroplasts of red algae have chlorophylls a and c (often), and phycobilins, while those of green algae have chloroplasts with chlorophyll a and b without phycobilins. Land plants are pigmented similarly to green algae and probably developed from them, thus the Chlorophyta is a sister taxon to the plants; sometimes the Chlorophyta, the Charophyta, and land plants are grouped together as the Viridiplantae.
Excavata and Rhizaria Green algae

These groups have green chloroplasts containing chlorophylls a and b.[21] Their chloroplasts are surrounded by four and three membranes, respectively, and were probably retained from ingested green algae.

Chlorarachniophytes, which belong to the phylum Cercozoa, contain a small nucleomorph, which is a relict of the algae's nucleus.

Euglenids, which belong to the phylum Euglenozoa, live primarily in fresh water and have chloroplasts with only three membranes. The endosymbiotic green algae may have been acquired through myzocytosis rather than phagocytosis.[22]

(Another group with green algae endosymbionts is the dinoflagellate genus Lepidodinium, which has replaced its original endosymbiont of red algal origin with one of green algal origin. A nucleomorph is present, and the host genome still have several red algal genes acquired through endosymbiotic gene transfer. Also the euglenid and chlorarachniophyte genome contain genes of apparent red algal ancestry)[23][24][25]

Halvaria and Hacrobia Red algae

These groups have chloroplasts containing chlorophylls a and c, and phycobilins. The shape can vary; they may be of discoid, plate-like, reticulate, cup-shaped, spiral, or ribbon shaped. They have one or more pyrenoids to preserve protein and starch. The latter chlorophyll type is not known from any prokaryotes or primary chloroplasts, but genetic similarities with red algae suggest a relationship there.[26]

In the first three of these groups (Chromista), the chloroplast has four membranes, retaining a nucleomorph in cryptomonads, and they likely share a common pigmented ancestor, although other evidence casts doubt on whether the heterokonts, Haptophyta, and cryptomonads are in fact more closely related to each other than to other groups.[27][28]

The typical dinoflagellate chloroplast has three membranes, but considerable diversity exists in chloroplasts within the group, and a number of endosymbiotic events apparently occurred.[5] The Apicomplexa, a group of closely related parasites, also have plastids called apicoplasts, which are not photosynthetic, but appear to have a common origin with dinoflagellate chloroplasts.[5]

Title page of Gmelin's Historia Fucorum, dated 1768

Linnaeus, in Species Plantarum (1753),[29] the starting point for modern botanical nomenclature, recognized 14 genera of algae, of which only four are currently considered among algae.[30] In Systema Naturae, Linnaeus described the genera Volvox and Corallina, and a species of Acetabularia (as Madrepora), among the animals.

In 1768, Samuel Gottlieb Gmelin (1744–1774) published the Historia Fucorum, the first work dedicated to marine algae and the first book on marine biology to use the then new binomial nomenclature of Linnaeus. It included elaborate illustrations of seaweed and marine algae on folded leaves.[31][32]

W. H. Harvey (1811–1866) and Lamouroux (1813)[33] were the first to divide macroscopic algae into four divisions based on their pigmentation. This is the first use of a biochemical criterion in plant systematics. Harvey's four divisions are: red algae (Rhodospermae), brown algae (Melanospermae), green algae (Chlorospermae), and Diatomaceae.[34][35]

At this time, microscopic algae were discovered and reported by a different group of workers (e.g., O. F. Müller and Ehrenberg) studying the Infusoria (microscopic organisms). Unlike macroalgae, which were clearly viewed as plants, microalgae were frequently considered animals because they are often motile.[33] Even the nonmotile (coccoid) microalgae were sometimes merely seen as stages of the lifecycle of plants, macroalgae, or animals.[36][37]

Although used as a taxonomic category in some pre-Darwinian classifications, e.g., Linnaeus (1753), de Jussieu (1789), Horaninow (1843), Agassiz (1859), Wilson & Cassin (1864), in further classifications, the "algae" are seen as an artificial, polyphyletic group.[citation needed]

Throughout the 20th century, most classifications treated the following groups as divisions or classes of algae: cyanophytes, rhodophytes, chrysophytes, xanthophytes, bacillariophytes, phaeophytes, pyrrhophytes (cryptophytes and dinophytes), euglenophytes, and chlorophytes. Later, many new groups were discovered (e.g., Bolidophyceae), and others were splintered from older groups: charophytes and glaucophytes (from chlorophytes), many heterokontophytes (e.g., synurophytes from chrysophytes, or eustigmatophytes from xanthophytes), haptophytes (from chrysophytes), and chlorarachniophytes (from xanthophytes).[citation needed]

With the abandonment of plant-animal dichotomous classification, most groups of algae (sometimes all) were included in Protista, later also abandoned in favour of Eukaryota. However, as a legacy of the older plant life scheme, some groups that were also treated as protozoans in the past still have duplicated classifications (see ambiregnal protists).[citation needed]

Some parasitic algae (e.g., the green algae Prototheca and Helicosporidium, parasites of metazoans, or Cephaleuros, parasites of plants) were originally classified as fungi, sporozoans, or protistans of incertae sedis,[38] while others (e.g., the green algae Phyllosiphon and Rhodochytrium, parasites of plants, or the red algae Pterocladiophila and Gelidiocolax mammillatus, parasites of other red algae, or the dinoflagellates Oodinium, parasites of fish) had their relationship with algae conjectured early. In other cases, some groups were originally characterized as parasitic algae (e.g., Chlorochytrium), but later were seen as endophytic algae.[39] Some filamentous bacteria (e.g., Beggiatoa) were originally seen as algae. Furthermore, groups like the apicomplexans are also parasites derived from ancestors that possessed plastids, but are not included in any group traditionally seen as algae.[citation needed]

Evolution

Algae are polyphyletic thus their origin cannot be traced back to single hypothetical common ancestor. It is thought that they came into existence when photosynthetic coccoid cyanobacteria got phagocytized by a unicellular heterotrophic eukaryote (possibly a protist),[40] giving rise to double-membranous primary plastids. Such symbiogenic events (primary symbiogenesis) are believed to have occurred more than 1.5 billion years ago during the Calymmian period, early in Boring Billion, but it is difficult to track the key events because of so much time gap.[41] Primary symbiogenesis gave rise to three divisions of archaeplastids, namely the Viridiplantae (green algae and later plants), Rhodophyta (red algae) and Glaucophyta ("grey algae"), whose plastids further spread into other protist lineages through eukaryote-eukaryote predation, engulfments and subsequent endosymbioses (secondary and tertiary symbiogenesis).[41] This process of serial cell "capture" and "enslavement" explains the diversity of photosynthetic eukaryotes.[40]

Recent genomic and phylogenomic approaches have significantly clarified plastid genome evolution, the horizontal movement of endosymbiont genes to the "host" nuclear genome, and plastid spread throughout the eukaryotic tree of life.[40]

Relationship to land plants

Fossils of isolated spores suggest land plants may have been around as long as 475 million years ago (mya) during the Late Cambrian/Early Ordovician period,[42][43] from sessile shallow freshwater charophyte algae much like Chara,[44] which likely got stranded ashore when riverine/lacustrine water levels dropped during dry seasons.[45] These charophyte algae probably already developed filamentous thalli and holdfasts that superficially resembled plant stems and roots, and probably had an isomorphic alternation of generations. They perhaps evolved some 850  mya[46] and might even be as early as 1 Gya during the late phase of the Boring Billion.[47]

Morphology

The kelp forest exhibit at the Monterey Bay Aquarium: A three-dimensional, multicellular thallus

A range of algal morphologies is exhibited, and convergence of features in unrelated groups is common. The only groups to exhibit three-dimensional multicellular thalli are the reds and browns, and some chlorophytes.[48] Apical growth is constrained to subsets of these groups: the florideophyte reds, various browns, and the charophytes.[48] The form of charophytes is quite different from those of reds and browns, because they have distinct nodes, separated by internode 'stems'; whorls of branches reminiscent of the horsetails occur at the nodes.[48] Conceptacles are another polyphyletic trait; they appear in the coralline algae and the Hildenbrandiales, as well as the browns.[48]

Most of the simpler algae are unicellular flagellates or amoeboids, but colonial and nonmotile forms have developed independently among several of the groups. Some of the more common organizational levels, more than one of which may occur in the lifecycle of a species, are

  • Colonial: small, regular groups of motile cells
  • Capsoid: individual non-motile cells embedded in mucilage
  • Coccoid: individual non-motile cells with cell walls
  • Palmelloid: nonmotile cells embedded in mucilage
  • Filamentous: a string of connected nonmotile cells, sometimes branching
  • Parenchymatous: cells forming a thallus with partial differentiation of tissues

In three lines, even higher levels of organization have been reached, with full tissue differentiation. These are the brown algae,[49]—some of which may reach 50 m in length (kelps)[50]—the red algae,[51] and the green algae.[52] The most complex forms are found among the charophyte algae (see Charales and Charophyta), in a lineage that eventually led to the higher land plants. The innovation that defines these nonalgal plants is the presence of female reproductive organs with protective cell layers that protect the zygote and developing embryo. Hence, the land plants are referred to as the Embryophytes.

Turfs

The term algal turf is commonly used but poorly defined. Algal turfs are thick, carpet-like beds of seaweed that retain sediment and compete with foundation species like corals and kelps, and they are usually less than 15 cm tall. Such a turf may consist of one or more species, and will generally cover an area in the order of a square metre or more. Some common characteristics are listed:[53]

  • Algae that form aggregations that have been described as turfs include diatoms, cyanobacteria, chlorophytes, phaeophytes and rhodophytes. Turfs are often composed of numerous species at a wide range of spatial scales, but monospecific turfs are frequently reported.[53]
  • Turfs can be morphologically highly variable over geographic scales and even within species on local scales and can be difficult to identify in terms of the constituent species.[53]
  • Turfs have been defined as short algae, but this has been used to describe height ranges from less than 0.5 cm to more than 10 cm. In some regions, the descriptions approached heights which might be described as canopies (20 to 30 cm).[53]


Physiology

Many algae, particularly species of the Characeae,[54] have served as model experimental organisms to understand the mechanisms of the water permeability of membranes, osmoregulation, turgor regulation,[clarification needed] salt tolerance, cytoplasmic streaming, and the generation of action potentials.

Phytohormones are found not only in higher plants, but in algae, too.[55]

Symbiotic algae

Some species of algae form symbiotic relationships with other organisms. In these symbioses, the algae supply photosynthates (organic substances) to the host organism providing protection to the algal cells. The host organism derives some or all of its energy requirements from the algae. Examples are:

Lichens

Main page: Biology:Lichen
Rock lichens in Ireland

Lichens are defined by the International Association for Lichenology to be "an association of a fungus and a photosynthetic symbiont resulting in a stable vegetative body having a specific structure".[56] The fungi, or mycobionts, are mainly from the Ascomycota with a few from the Basidiomycota. In nature, they do not occur separate from lichens. It is unknown when they began to associate.[57] One mycobiont associates with the same phycobiont species, rarely two, from the green algae, except that alternatively, the mycobiont may associate with a species of cyanobacteria (hence "photobiont" is the more accurate term). A photobiont may be associated with many different mycobionts or may live independently; accordingly, lichens are named and classified as fungal species.[58] The association is termed a morphogenesis because the lichen has a form and capabilities not possessed by the symbiont species alone (they can be experimentally isolated). The photobiont possibly triggers otherwise latent genes in the mycobiont.[59]

Trentepohlia is an example of a common green alga genus worldwide that can grow on its own or be lichenised. Lichen thus share some of the habitat and often similar appearance with specialized species of algae (aerophytes) growing on exposed surfaces such as tree trunks and rocks and sometimes discoloring them.

Coral reefs

Main pages: Biology:Coral, Biology:Earth:Coral reef, and Biology:Symbiodinium
Floridian coral reef

Coral reefs are accumulated from the calcareous exoskeletons of marine invertebrates of the order Scleractinia (stony corals). These animals metabolize sugar and oxygen to obtain energy for their cell-building processes, including secretion of the exoskeleton, with water and carbon dioxide as byproducts. Dinoflagellates (algal protists) are often endosymbionts in the cells of the coral-forming marine invertebrates, where they accelerate host-cell metabolism by generating sugar and oxygen immediately available through photosynthesis using incident light and the carbon dioxide produced by the host. Reef-building stony corals (hermatypic corals) require endosymbiotic algae from the genus Symbiodinium to be in a healthy condition.[60] The loss of Symbiodinium from the host is known as coral bleaching, a condition which leads to the deterioration of a reef.

Sea sponges

Endosymbiontic green algae live close to the surface of some sponges, for example, breadcrumb sponges (Halichondria panicea). The alga is thus protected from predators; the sponge is provided with oxygen and sugars which can account for 50 to 80% of sponge growth in some species.[61]

Life cycle

Further information: Conceptacle

Rhodophyta, Chlorophyta, and Heterokontophyta, the three main algal divisions, have life cycles which show considerable variation and complexity. In general, an asexual phase exists where the seaweed's cells are diploid, a sexual phase where the cells are haploid, followed by fusion of the male and female gametes. Asexual reproduction permits efficient population increases, but less variation is possible. Commonly, in sexual reproduction of unicellular and colonial algae, two specialized, sexually compatible, haploid gametes make physical contact and fuse to form a zygote. To ensure a successful mating, the development and release of gametes is highly synchronized and regulated; pheromones may play a key role in these processes.[62] Sexual reproduction allows for more variation and provides the benefit of efficient recombinational repair of DNA damages during meiosis, a key stage of the sexual cycle.[63] However, sexual reproduction is more costly than asexual reproduction.[64] Meiosis has been shown to occur in many different species of algae.[65]

Numbers

Algae on coastal rocks at Shihtiping in Taiwan

The Algal Collection of the US National Herbarium (located in the National Museum of Natural History) consists of approximately 320,500 dried specimens, which, although not exhaustive (no exhaustive collection exists), gives an idea of the order of magnitude of the number of algal species (that number remains unknown).[66] Estimates vary widely. For example, according to one standard textbook,[67] in the British Isles the UK Biodiversity Steering Group Report estimated there to be 20,000 algal species in the UK. Another checklist reports only about 5,000 species. Regarding the difference of about 15,000 species, the text concludes: "It will require many detailed field surveys before it is possible to provide a reliable estimate of the total number of species ..."

Regional and group estimates have been made, as well:

  • 5,000–5,500 species of red algae worldwide
  • "some 1,300 in Australian Seas"[68]
  • 400 seaweed species for the western coastline of South Africa,[69] and 212 species from the coast of KwaZulu-Natal.[70] Some of these are duplicates, as the range extends across both coasts, and the total recorded is probably about 500 species. Most of these are listed in List of seaweeds of South Africa. These exclude phytoplankton and crustose corallines.
  • 669 marine species from California (US)[71]
  • 642 in the check-list of Britain and Ireland[72]

and so on, but lacking any scientific basis or reliable sources, these numbers have no more credibility than the British ones mentioned above. Most estimates also omit microscopic algae, such as phytoplankton.

The most recent estimate suggests 72,500 algal species worldwide.[73]

Distribution

The distribution of algal species has been fairly well studied since the founding of phytogeography in the mid-19th century.[74] Algae spread mainly by the dispersal of spores analogously to the dispersal of Plantae by seeds and spores. This dispersal can be accomplished by air, water, or other organisms. Due to this, spores can be found in a variety of environments: fresh and marine waters, air, soil, and in or on other organisms.[74] Whether a spore is to grow into an organism depends on the combination of the species and the environmental conditions where the spore lands.

The spores of freshwater algae are dispersed mainly by running water and wind, as well as by living carriers.[74] However, not all bodies of water can carry all species of algae, as the chemical composition of certain water bodies limits the algae that can survive within them.[74] Marine spores are often spread by ocean currents. Ocean water presents many vastly different habitats based on temperature and nutrient availability, resulting in phytogeographic zones, regions, and provinces.[75]

To some degree, the distribution of algae is subject to floristic discontinuities caused by geographical features, such as Antarctica, long distances of ocean or general land masses. It is, therefore, possible to identify species occurring by locality, such as "Pacific algae" or "North Sea algae". When they occur out of their localities, hypothesizing a transport mechanism is usually possible, such as the hulls of ships. For example, Ulva reticulata and U. fasciata travelled from the mainland to Hawaii in this manner.

Mapping is possible for select species only: "there are many valid examples of confined distribution patterns."[76] For example, Clathromorphum is an arctic genus and is not mapped far south of there.[77] However, scientists regard the overall data as insufficient due to the "difficulties of undertaking such studies."[78]

Ecology

Phytoplankton, Lake Chūzenji

Algae are prominent in bodies of water, common in terrestrial environments, and are found in unusual environments, such as on snow and ice. Seaweeds grow mostly in shallow marine waters, under 100 m (330 ft) deep; however, some such as Navicula pennata have been recorded to a depth of 360 m (1,180 ft).[79] A type of algae, Ancylonema nordenskioeldii, was found in Greenland in areas known as the 'Dark Zone', which caused an increase in the rate of melting ice sheet.[80] Same algae was found in the Italian Alps, after pink ice appeared on parts of the Presena glacier.[81]

The various sorts of algae play significant roles in aquatic ecology. Microscopic forms that live suspended in the water column (phytoplankton) provide the food base for most marine food chains. In very high densities (algal blooms), these algae may discolor the water and outcompete, poison, or asphyxiate other life forms.

Algae can be used as indicator organisms to monitor pollution in various aquatic systems.[82] In many cases, algal metabolism is sensitive to various pollutants. Due to this, the species composition of algal populations may shift in the presence of chemical pollutants.[82] To detect these changes, algae can be sampled from the environment and maintained in laboratories with relative ease.[82]

On the basis of their habitat, algae can be categorized as: aquatic (planktonic, benthic, marine, freshwater, lentic, lotic),[83] terrestrial, aerial (subaerial),[84] lithophytic, halophytic (or euryhaline), psammon, thermophilic, cryophilic, epibiont (epiphytic, epizoic), endosymbiont (endophytic, endozoic), parasitic, calcifilic or lichenic (phycobiont).[85]

Cultural associations

In classical Chinese, the word 藻 is used both for "algae" and (in the modest tradition of the imperial scholars) for "literary talent". The third island in Kunming Lake beside the Summer Palace in Beijing is known as the Zaojian Tang Dao (藻鑒堂島), which thus simultaneously means "Island of the Algae-Viewing Hall" and "Island of the Hall for Reflecting on Literary Talent".

Cultivation

This section is an excerpt from Algaculture[ edit ]

Seaweed farming

This section is an excerpt from seaweed farming[ edit ]

Bioreactors

This section is an excerpt from Algae bioreactor[ edit ]

Uses

Harvesting algae

Agar

Agar, a gelatinous substance derived from red algae, has a number of commercial uses.[86] It is a good medium on which to grow bacteria and fungi, as most microorganisms cannot digest agar.

Alginates

Alginic acid, or alginate, is extracted from brown algae. Its uses range from gelling agents in food, to medical dressings. Alginic acid also has been used in the field of biotechnology as a biocompatible medium for cell encapsulation and cell immobilization. Molecular cuisine is also a user of the substance for its gelling properties, by which it becomes a delivery vehicle for flavours.

Between 100,000 and 170,000 wet tons of Macrocystis are harvested annually in New Mexico for alginate extraction and abalone feed.[87][88]

Energy source

To be competitive and independent from fluctuating support from (local) policy on the long run, biofuels should equal or beat the cost level of fossil fuels. Here, algae-based fuels hold great promise,[89][90] directly related to the potential to produce more biomass per unit area in a year than any other form of biomass. The break-even point for algae-based biofuels is estimated to occur by 2025.[91]

Fertilizer

Further information: Seaweed fertiliser
Seaweed-fertilized gardens on Inisheer

For centuries, seaweed has been used as a fertilizer; George Owen of Henllys writing in the 16th century referring to drift weed in South Wales:[92]

This kind of ore they often gather and lay on great heapes, where it heteth and rotteth, and will have a strong and loathsome smell; when being so rotten they cast on the land, as they do their muck, and thereof springeth good corn, especially barley ... After spring-tydes or great rigs of the sea, they fetch it in sacks on horse backes, and carie the same three, four, or five miles, and cast it on the lande, which doth very much better the ground for corn and grass.

Today, algae are used by humans in many ways; for example, as fertilizers, soil conditioners, and livestock feed.[93] Aquatic and microscopic species are cultured in clear tanks or ponds and are either harvested or used to treat effluents pumped through the ponds. Algaculture on a large scale is an important type of aquaculture in some places. Maerl is commonly used as a soil conditioner.

Nutrition

Dulse, a type of edible seaweed

Naturally growing seaweeds are an important source of food, especially in Asia, leading some to label them as superfoods.[94] They provide many vitamins including: A, B1, B2, B6, niacin, and C, and are rich in iodine, potassium, iron, magnesium, and calcium.[95] In addition, commercially cultivated microalgae, including both algae and cyanobacteria, are marketed as nutritional supplements, such as spirulina,[96] Chlorella and the vitamin-C supplement from Dunaliella, high in beta-carotene.

Algae are national foods of many nations: China consumes more than 70 species, including fat choy, a cyanobacterium considered a vegetable; Japan, over 20 species such as nori and aonori;[97] Ireland, dulse; Chile , cochayuyo.[98] Laver is used to make laverbread in Wales, where it is known as bara lawr. In Korea, green laver is used to make gim. It is also used along the west coast of North America from California to British Columbia, in Hawaii and by the Māori of New Zealand. Sea lettuce and badderlocks are salad ingredients in Scotland, Ireland, Greenland, and Iceland. Algae is being considered a potential solution for world hunger problem.[99][100][101]

Two popular forms of algae are used in cuisine:

Furthermore, it contains all nine of the essential amino acids the body does not produce on its own[102]

The oils from some algae have high levels of unsaturated fatty acids. For example, Parietochloris incisa is high in arachidonic acid, where it reaches up to 47% of the triglyceride pool.[103] Some varieties of algae favored by vegetarianism and veganism contain the long-chain, essential omega-3 fatty acids, docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA). Fish oil contains the omega-3 fatty acids, but the original source is algae (microalgae in particular), which are eaten by marine life such as copepods and are passed up the food chain.[104] Algae have emerged in recent years as a popular source of omega-3 fatty acids for vegetarians who cannot get long-chain EPA and DHA from other vegetarian sources such as flaxseed oil, which only contains the short-chain alpha-linolenic acid (ALA).

Pollution control

  • Sewage can be treated with algae,[105] reducing the use of large amounts of toxic chemicals that would otherwise be needed.
  • Algae can be used to capture fertilizers in runoff from farms. When subsequently harvested, the enriched algae can be used as fertilizer.
  • Aquaria and ponds can be filtered using algae, which absorb nutrients from the water in a device called an algae scrubber, also known as an algae turf scrubber.[106][107]

Agricultural Research Service scientists found that 60–90% of nitrogen runoff and 70–100% of phosphorus runoff can be captured from manure effluents using a horizontal algae scrubber, also called an algal turf scrubber (ATS). Scientists developed the ATS, which consists of shallow, 100-foot raceways of nylon netting where algae colonies can form, and studied its efficacy for three years. They found that algae can readily be used to reduce the nutrient runoff from agricultural fields and increase the quality of water flowing into rivers, streams, and oceans. Researchers collected and dried the nutrient-rich algae from the ATS and studied its potential as an organic fertilizer. They found that cucumber and corn seedlings grew just as well using ATS organic fertilizer as they did with commercial fertilizers.[108] Algae scrubbers, using bubbling upflow or vertical waterfall versions, are now also being used to filter aquaria and ponds.

Polymers

Various polymers can be created from algae, which can be especially useful in the creation of bioplastics. These include hybrid plastics, cellulose-based plastics, poly-lactic acid, and bio-polyethylene.[109] Several companies have begun to produce algae polymers commercially, including for use in flip-flops[110] and in surf boards.[111]

Bioremediation

The alga Stichococcus bacillaris has been seen to colonize silicone resins used at archaeological sites; biodegrading the synthetic substance.[112]

Pigments

The natural pigments (carotenoids and chlorophylls) produced by algae can be used as alternatives to chemical dyes and coloring agents.[113] The presence of some individual algal pigments, together with specific pigment concentration ratios, are taxon-specific: analysis of their concentrations with various analytical methods, particularly high-performance liquid chromatography, can therefore offer deep insight into the taxonomic composition and relative abundance of natural algae populations in sea water samples.[114][115]

Stabilizing substances

Main pages: Chemistry:Carrageenan and Biology:Chondrus crispus

Carrageenan, from the red alga Chondrus crispus, is used as a stabilizer in milk products.

Additional images

  • Algae bladder

See also

References

  1. ↑ Butterfield, N. J. (2000). "Bangiomorpha pubescens n. gen., n. sp.: Implications for the evolution of sex, multicellularity, and the Mesoproterozoic/Neoproterozoic radiation of eukaryotes". Paleobiology 26 (3): 386–404. doi:10.1666/0094-8373(2000)026<0386:BPNGNS>2.0.CO;2. ISSN 0094-8373. http://paleobiol.geoscienceworld.org/cgi/content/abstract/26/3/386. 
  2. ↑ T.M. Gibson (2018). "Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis". Geology 46 (2): 135–138. doi:10.1130/G39829.1. Bibcode: 2018Geo....46..135G. https://pubs.geoscienceworld.org/gsa/geology/article/46/2/135/524864/Precise-age-of-Bangiomorpha-pubescens-dates-the. 
  3. ↑ "ALGAE | English meaning - Cambridge Dictionary". https://dictionary.cambridge.org/dictionary/english/algae. 
  4. ↑ 4.0 4.1 Nabors, Murray W. (2004). Introduction to Botany. San Francisco: Pearson Education, Inc. ISBN 978-0-8053-4416-5. 
  5. ↑ 5.0 5.1 5.2 Keeling, Patrick J. (2004). "Diversity and evolutionary history of plastids and their hosts". American Journal of Botany 91 (10): 1481–1493. doi:10.3732/ajb.91.10.1481. PMID 21652304. 
  6. ↑ Palmer, J. D.; Soltis, D. E.; Chase, M. W. (2004). "The plant tree of life: an overview and some points of view". American Journal of Botany 91 (10): 1437–1445. doi:10.3732/ajb.91.10.1437. PMID 21652302. 
  7. ↑ Smithsonian National Museum of Natural History; Department of Botany. "Algae Research". http://botany.si.edu/projects/algae/introduction.htm. 
  8. ↑ Pringsheim, E. G. 1963. Farblose Algen. Ein beitrag zur Evolutionsforschung. Gustav Fischer Verlag, Stuttgart. 471 pp., species:Algae#Pringsheim (1963).
  9. ↑ Tartar, A.; Boucias, D. G.; Becnel, J. J.; Adams, B. J. (2003). "Comparison of plastid 16S rRNA (rrn 16) genes from Helicosporidium spp.: Evidence supporting the reclassification of Helicosporidia as green algae (Chlorophyta)". International Journal of Systematic and Evolutionary Microbiology 53 (Pt 6): 1719–1723. doi:10.1099/ijs.0.02559-0. PMID 14657099. 
  10. ↑ Figueroa-Martinez, F.; Nedelcu, A. M.; Smith, D. R.; Reyes-Prieto, A. (2015). "When the lights go out: the evolutionary fate of free-living colorless green algae". New Phytologist 206 (3): 972–982. doi:10.1111/nph.13279. PMID 26042246. 
  11. ↑ Bengtson, S.; Belivanova, V.; Rasmussen, B.; Whitehouse, M. (2009). "The controversial 'Cambrian' fossils of the Vindhyan are real but more than a billion years older". Proceedings of the National Academy of Sciences of the United States of America 106 (19): 7729–7734. doi:10.1073/pnas.0812460106. PMID 19416859. Bibcode: 2009PNAS..106.7729B. 
  12. ↑ Paul, Vishal; Chandra Shekharaiah, P. S.; Kushwaha, Shivbachan; Sapre, Ajit; Dasgupta, Santanu; Sanyal, Debanjan (2020). "Role of Algae in CO2 Sequestration Addressing Climate Change: A Review". in Deb, Dipankar; Dixit, Ambesh; Chandra, Laltu (in en). Renewable Energy and Climate Change. Smart Innovation, Systems and Technologies. 161. Singapore: Springer. pp. 257–265. doi:10.1007/978-981-32-9578-0_23. ISBN 978-981-329-578-0. https://link.springer.com/chapter/10.1007/978-981-32-9578-0_23. 
  13. ↑ "alga, algae". Webster's Third New International Dictionary of the English Language Unabridged with Seven Language Dictionary. 1. Encyclopædia Britannica, Inc. 1986. 
  14. ↑ Partridge, Eric (1983). "algae". Origins. Greenwich House. ISBN 9780517414255. https://archive.org/details/originsshortetym0000part. 
  15. ↑ Lewis, Charlton T.; Short, Charles (1879). "Alga". A Latin Dictionary. Oxford: Clarendon Press. https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0059%3Aalphabetic+letter%3DA%3Aentry+group%3D37%3Aentry%3Dalga. Retrieved 31 December 2017. 
  16. ↑ Cheyne, Thomas Kelly; Black, John Sutherland (1902). Encyclopædia biblica: A critical dictionary of the literary, political and religious history, the archæology, geography, and natural history of the Bible. Macmillan Company. p. 3525. https://books.google.com/books?id=GccVAAAAYAAJ&pg=PA3525. 
  17. ↑ Lee, Robert Edward, ed. (2008), "Basic characteristics of the algae", Phycology (Cambridge: Cambridge University Press): pp. 3–30, doi:10.1017/CBO9780511812897.002, ISBN 978-1-107-79688-1, https://www.cambridge.org/core/books/phycology/basic-characteristics-of-the-algae/64674E3DEFD655BDAB55324B95265EEC, retrieved 2023-09-13 
  18. ↑ Lee, R. E. (2008). Phycology. Cambridge University Press. ISBN 9780521367448. https://archive.org/details/phycology00leer_0. 
  19. ↑ Allaby, M., ed (1992). "Algae". The Concise Dictionary of Botany. Oxford University Press. 
  20. ↑ Bhattacharya, D.; Medlin, L. (1998). "Algal Phylogeny and the Origin of Land Plants". Plant Physiology 116 (1): 9–15. doi:10.1104/pp.116.1.9. PMC 1539170. http://www.plantphysiol.org/cgi/reprint/116/1/9.pdf. 
  21. ↑ Losos, Jonathan B.; Mason, Kenneth A.; Singer, Susan R. (2007). Biology (8 ed.). McGraw-Hill. ISBN 978-0-07-304110-0. 
  22. ↑ Archibald, J. M.; Keeling, P. J. (November 2002). "Recycled plastids: A 'green movement' in eukaryotic evolution". Trends in Genetics 18 (11): 577–584. doi:10.1016/S0168-9525(02)02777-4. PMID 12414188. 
  23. ↑ O'Neill, Ellis C.; Trick, Martin; Henrissat, Bernard; Field, Robert A. (2015). "Euglena in time: Evolution, control of central metabolic processes and multi-domain proteins in carbohydrate and natural product biochemistry". Perspectives in Science 6: 84–93. doi:10.1016/j.pisc.2015.07.002. Bibcode: 2015PerSc...6...84O. 
  24. ↑ Ponce-Toledo, Rafael I.; López-García, Purificación; Moreira, David (October 2019). "Horizontal and endosymbiotic gene transfer in early plastid evolution" (in en). New Phytologist 224 (2): 618–624. doi:10.1111/nph.15965. ISSN 0028-646X. PMID 31135958. 
  25. ↑ Ponce-Toledo, Rafael I; Moreira, David; López-García, Purificación; Deschamps, Philippe (2018-06-19). "Secondary Plastids of Euglenids and Chlorarachniophytes Function with a Mix of Genes of Red and Green Algal Ancestry". Molecular Biology and Evolution 35 (9): 2198–2204. doi:10.1093/molbev/msy121. ISSN 0737-4038. PMID 29924337. PMC 6949139. https://doi.org/10.1093/molbev/msy121. 
  26. ↑ Janson, Sven; Graneli, Edna (September 2003). "Genetic analysis of the psbA gene from single cells indicates a cryptomonad origin of the plastid in Dinophysis (Dinophyceae)". Phycologia 42 (5): 473–477. doi:10.2216/i0031-8884-42-5-473.1. ISSN 0031-8884. Bibcode: 2003Phyco..42..473J. 
  27. ↑ Wegener Parfrey, Laura; Barbero, Erika; Lasser, Elyse; Dunthorn, Micah; Bhattacharya, Debashish; Patterson, David J.; Katz, Laura A (December 2006). "Evaluating Support for the Current Classification of Eukaryotic Diversity". PLOS Genetics 2 (12): e220. doi:10.1371/journal.pgen.0020220. PMID 17194223. 
  28. ↑ Burki, F. et al. (2007). Butler, Geraldine. ed. "Phylogenomics Reshuffles the Eukaryotic Supergroups". PLOS ONE 2 (8): e790. doi:10.1371/journal.pone.0000790. PMID 17726520. Bibcode: 2007PLoSO...2..790B. 
  29. ↑ Linnæus, Caroli (1753). Species Plantarum. 2. Impensis Laurentii Salvii. p. 1131. https://www.biodiversitylibrary.org/item/13830#page/573/mode/1up. 
  30. ↑ Sharma, O. P. (1 January 1986). Textbook of Algae. Tata McGraw-Hill. p. 22. ISBN 9780074519288. https://books.google.com/books?id=hOa74Hm4zDIC&pg=PA22. 
  31. ↑ Gmelin, S. G. (1768). Historia Fucorum. St. Petersburg: Ex typographia Academiae scientiarum. https://books.google.com/books?id=YUAAAAAAQAAJ&q=%22Historia+Fucorum%22. 
  32. ↑ Silva, P. C.; Basson, P. W.; Moe, R. L. (1996). Catalogue of the Benthic Marine Algae of the Indian Ocean. University of California Press. ISBN 9780520915817. https://books.google.com/books?id=vuWEemVY8WEC&q=%22Historia+Fucorum%22+binomial+nomenclature&pg=PA2. 
  33. ↑ 33.0 33.1 Medlin, Linda K.; Kooistra, Wiebe H. C. F.; Potter, Daniel; Saunders, Gary W.; Anderson, Robert A. (1997). "Phylogenetic relationships of the 'golden algae' (haptophytes, heterokont chromophytes) and their plastids". Plant Systematics and Evolution: 188. http://epic.awi.de/2100/1/Med1997c.pdf. 
  34. ↑ Dixon, P. S. (1973). Biology of the Rhodophyta. Edinburgh: Oliver & Boyd. p. 232. ISBN 978-0-05-002485-0. 
  35. ↑ Harvey, D. (1836). "Algae". in Mackay, J. T.. Flora hibernica comprising the Flowering Plants Ferns Characeae Musci Hepaticae Lichenes and Algae of Ireland arranged according to the natural system with a synopsis of the genera according to the Linnaean system. pp. 157–254. http://img.algaebase.org/pdf/562E38EB0a0fc2A17Eukv24B7E9F/18893.pdf. Retrieved 31 December 2017. .
  36. ↑ Braun, A. Algarum unicellularium genera nova et minus cognita, praemissis observationibus de algis unicellularibus in genere (New and less known genera of unicellular algae, preceded by observations respecting unicellular algae in general) . Lipsiae, Apud W. Engelmann, 1855. Translation at: Lankester, E. & Busk, G. (eds.). Quarterly Journal of Microscopical Science, 1857, vol. 5, (17), 13–16 ; (18), 90–96 ; (19), 143–149 .
  37. ↑ Siebold, C. Th. v. "Ueber einzellige Pflanzen und Thiere (On unicellular plants and animals) ". In: Siebold, C. Th. v. & Kölliker, A. (1849). Zeitschrift für wissenschaftliche Zoologie, Bd. 1, p. 270. Translation at: Lankester, E. & Busk, G. (eds.). Quarterly Journal of Microscopical Science, 1853, vol. 1, (2), 111–121 ; (3), 195–206 .
  38. ↑ Williams, B. A.; Keeling, P. J. (2003). "Cryptic organelles in parasitic protists and fungi". in Littlewood, D. T. J.. The Evolution of Parasitism. London: Elsevier Academic Press. p. 46. ISBN 978-0-12-031754-7. https://books.google.com/books?id=_fAQGEJobT0C&pg=PA46. 
  39. ↑ Round (1981). pp. 398–400, Round, F. E. (8 March 1984). The Ecology of Algae. CUP Archive. ISBN 9780521269063. https://books.google.com/books?id=Rm08AAAAIAAJ&pg=PA398. Retrieved 6 February 2015. .
  40. ↑ 40.0 40.1 40.2 Reyes-Prieto, Adrian; Weber, Andreas P.M.; Bhattacharya, Debashish (2007). "The Origin and Establishment of the Plastid in Algae and Plants". Annual Review of Genetics 41: 147–168. doi:10.1146/annurev.genet.41.110306.130134. PMID 17600460. https://www.annualreviews.org/doi/10.1146/annurev.genet.41.110306.130134. Retrieved 2023-12-03. 
  41. ↑ 41.0 41.1 Khan, Amna Komal; Kausar, Humera; Jaferi, Syyada Samra; Drouet, Samantha; Hano, Christophe; Abbasi, Bilal Haider; Anjum, Sumaira (2020-11-06). "An Insight into the Algal Evolution and Genomics". Biomolecules 10 (11): 1524. doi:10.3390/biom10111524. PMID 33172219. 
  42. ↑ Noble, Ivan (18 September 2003). "When plants conquered land". BBC. http://news.bbc.co.uk/1/hi/sci/tech/3117034.stm. 
  43. ↑ Wellman, C. H.; Osterloff, P. L.; Mohiuddin, U. (2003). "Fragments of the earliest land plants". Nature 425 (6955): 282–285. doi:10.1038/nature01884. PMID 13679913. Bibcode: 2003Natur.425..282W. http://eprints.whiterose.ac.uk/106/. 
  44. ↑ Kenrick, P.; Crane, P.R. (1997). The origin and early diversification of land plants. A cladistic study. Washington: Smithsonian Institution Press. ISBN 978-1-56098-729-1. 
  45. ↑ Raven, J.A.; Edwards, D. (2001). "Roots: evolutionary origins and biogeochemical significance". Journal of Experimental Botany 52 (90001): 381–401. doi:10.1093/jexbot/52.suppl_1.381. PMID 11326045. 
  46. ↑ Knauth, L. Paul; Kennedy, Martin J. (2009). "The late Precambrian greening of the Earth". Nature 460 (7256): 728–732. doi:10.1038/nature08213. PMID 19587681. Bibcode: 2009Natur.460..728K. 
  47. ↑ Strother, Paul K.; Battison, Leila; Brasier, Martin D.; Wellman, Charles H. (2011). "Earth's earliest non-marine eukaryotes". Nature 473 (7348): 505–509. doi:10.1038/nature09943. PMID 21490597. Bibcode: 2011Natur.473..505S. 
  48. ↑ 48.0 48.1 48.2 48.3 Xiao, S.; Knoll, A. H.; Yuan, X.; Pueschel, C. M. (2004). "Phosphatized multicellular algae in the Neoproterozoic Doushantuo Formation, China, and the early evolution of florideophyte red algae". American Journal of Botany 91 (2): 214–227. doi:10.3732/ajb.91.2.214. PMID 21653378. 
  49. ↑ Waggoner, Ben (1994–2008). "Introduction to the Phaeophyta: Kelps and brown "Algae"". University of California Museum of Palaeontology (UCMP). http://www.ucmp.berkeley.edu/chromista/phaeophyta.html. 
  50. ↑ Thomas, D. N. (2002). Seaweeds. London: The Natural History Museum. ISBN 978-0-565-09175-0. 
  51. ↑ Waggoner, Ben (1994–2008). "Introduction to the Rhodophyta, the red 'algae'". University of California Museum of Palaeontology (UCMP). http://www.ucmp.berkeley.edu/protista/rhodophyta.html. 
  52. ↑ "Introduction to the Green Algae". berkeley.edu. http://www.ucmp.berkeley.edu/greenalgae/greenalgae.html. 
  53. ↑ 53.0 53.1 53.2 53.3 Connell, Sean; Foster, M.S.; Airoldi, Laura (9 January 2014). "What are algal turfs? Towards a better description of turfs". Marine Ecology Progress Series 495: 299–307. doi:10.3354/meps10513. Bibcode: 2014MEPS..495..299C. https://www.researchgate.net/publication/285992380. 
  54. ↑ Tazawa, Masashi (2010). "Sixty Years Research with Characean Cells: Fascinating Material for Plant Cell Biology". Progress in Botany 72. 72. Springer. pp. 5–34. doi:10.1007/978-3-642-13145-5_1. ISBN 978-3-642-13145-5. https://books.google.com/books?id=iMxH0-q42PkC&pg=PA31. Retrieved 7 October 2012. 
  55. ↑ Tarakhovskaya, E. R.; Maslov, Yu. I.; Shishova, M. F. (April 2007). "Phytohormones in algae". Russian Journal of Plant Physiology 54 (2): 163–170. doi:10.1134/s1021443707020021. 
  56. ↑ Brodo, Irwin M.; Sharnoff, Sylvia Duran; Sharnoff, Stephen; Laurie-Bourque, Susan (2001). Lichens of North America. New Haven: Yale University Press. p. 8. ISBN 978-0-300-08249-4. 
  57. ↑ Pearson, Lorentz C. (1995). The Diversity and Evolution of Plants. CRC Press. p. 221. ISBN 978-0-8493-2483-3. 
  58. ↑ Brodo et al. (2001), p. 6: "A species of lichen collected anywhere in its range has the same lichen-forming fungus and, generally, the same photobiont. (A particular photobiont, though, may associate with scores of different lichen fungi)."
  59. ↑ Brodo et al. (2001), p. 8.
  60. ↑ Taylor, Dennis L. (1983). "The coral-algal symbiosis". in Goff, Lynda J.. Algal Symbiosis: A Continuum of Interaction Strategies. CUP Archive. pp. 19–20. ISBN 978-0-521-25541-7. https://archive.org/details/algalsymbiosisco0000unse. 
  61. ↑ Knight, Susan (Fall 2001). "Are There Sponges in Your Lake?". Lake Tides (Wisconsin Lakes Partnership) 26 (4): 4–5. http://uwsp.edu/cnr/UWEXlakes/laketides/vol26-4/vol26-4.pdf. Retrieved 4 August 2007. 
  62. ↑ Frenkel, J.; Vyverman, W.; Pohnert, G. (2014). "Pheromone signaling during sexual reproduction in algae". Plant J. 79 (4): 632–644. doi:10.1111/tpj.12496. PMID 24597605. 
  63. ↑ Bernstein, Harris; Byerly, Henry C.; Hopf, Frederic A.; Michod, Richard E. (1985-09-20). "Genetic Damage, Mutation, and the Evolution of Sex" (in en). Science 229 (4719): 1277–1281. doi:10.1126/science.3898363. ISSN 0036-8075. PMID 3898363. Bibcode: 1985Sci...229.1277B. https://www.science.org/doi/10.1126/science.3898363. 
  64. ↑ Otto, S. P. (2009). "The evolutionary enigma of sex". Am. Nat. 174 (Suppl 1): S1–S14. doi:10.1086/599084. PMID 19441962. https://www.researchgate.net/publication/24427058. 
  65. ↑ Heywood, P.; Magee, P. T. (1976). "Meiosis in protists: Some structural and physiological aspects of meiosis in algae, fungi, and protozoa". Bacteriol Rev 40 (1): 190–240. doi:10.1128/MMBR.40.1.190-240.1976. PMID 773364. 
  66. ↑ "Algae Herbarium". National Museum of Natural History, Department of Botany. 2008. http://botany.si.edu/projects/algae/herbarium.htm. 
  67. ↑ John (2002), p. 1.
  68. ↑ Huisman (2000), p. 25.
  69. ↑ Stegenga (1997).
  70. ↑ Clerck, Olivier (2005). Guide to the seaweeds of KwaZulu-Natal. National Botanic Garden of Belgium. ISBN 978-90-72619-64-8. 
  71. ↑ Abbott and Hollenberg (1976), p. 2.
  72. ↑ Hardy and Guiry (2006).
  73. ↑ Guiry, Michael D. (2012). "How Many Species of Algae Are There?". Journal of Phycology 48 (5): 1057–1063. doi:10.1111/j.1529-8817.2012.01222.x. PMID 27011267. Bibcode: 2012JPcgy..48.1057G. https://www.researchgate.net/publication/263561612. 
  74. ↑ 74.0 74.1 74.2 74.3 Round, F. E. (1981). "Chapter 8, Dispersal, continuity and phytogeography". The ecology of algae. CUP Archive. pp. 357–361. ISBN 9780521269063. https://books.google.com/books?id=Rm08AAAAIAAJ&pg=PA398. 
  75. ↑ Round (1981), p. 362.
  76. ↑ Round (1981), p. 357.
  77. ↑ Round (1981), p. 371.
  78. ↑ Round (1981), p. 366.
  79. ↑ Round (1981), p. 176.
  80. ↑ "Greenland Has a Mysterious 'Dark Zone' — And It's Getting Even Darker". 10 April 2018. https://www.space.com/40266-greenland-dark-zone-gets-darker.html. 
  81. ↑ "Alpine glacier turning pink due to algae that accelerates climate change, scientists say". 6 July 2020. https://news.sky.com/story/alpine-glacier-turning-pink-due-to-algae-that-accelerates-climate-change-scientists-say-12022244. 
  82. ↑ 82.0 82.1 82.2 Omar, Wan Maznah Wan (Dec 2010). "Perspectives on the Use of Algae as Biological Indicators for Monitoring and Protecting Aquatic Environments, with Special Reference to Malaysian Freshwater Ecosystems". Trop Life Sci Res 21 (2): 51–67. PMID 24575199. 
  83. ↑ Necchi Jr., O. (ed.) (2016). River Algae. Springer, Necchi, Orlando J. R. (2 June 2016). River Algae. Springer. ISBN 9783319319841. https://books.google.com/books?id=KptPDAAAQBAJ. .
  84. ↑ Johansen, J. R. (2012). "The Diatoms: Applications for the Environmental and Earth Sciences". in Smol, J. P.; Stoermer, E. F.. Diatoms of aerial habitats (2nd ed.). Cambridge University Press. pp. 465–472. ISBN 9781139492621. https://books.google.com/books?id=SpuPKw7zZGAC&pg=PA465. 
  85. ↑ Sharma, O. P. (1986). pp. 2–6, [1].
  86. ↑ Lewis, J. G.; Stanley, N. F.; Guist, G. G. (1988). "9. Commercial production of algal hydrocolloides". in Lembi, C. A.; Waaland, J. R.. Algae and Human Affairs. Cambridge University Press. ISBN 978-0-521-32115-0. 
  87. ↑ "Macrocystis C. Agardh 1820: 46". AlgaeBase. http://www.algaebase.org/generadetail.lasso?genus_id=35715&-session=abv3:51909EC307dcf25DFApmi3530315. 
  88. ↑ "Secondary Products of Brown Algae". Algae Research. Smithsonian National Museum of Natural History. http://botany.si.edu/projects/algae/economicuses/brownalgae.htm. 
  89. ↑ Chisti, Y. (May–Jun 2007). "Biodiesel from microalgae". Biotechnology Advances 25 (3): 294–306. doi:10.1016/j.biotechadv.2007.02.001. PMID 17350212. https://www.academia.edu/2137836. 
  90. ↑ Yang, Z. K.; Niu, Y. F.; Ma, Y. H.; Xue, J.; Zhang, M. H.; Yang, W. D.; Liu, J. S.; Lu, S. H. et al. (4 May 2013). "Molecular and cellular mechanisms of neutral lipid accumulation in diatom following nitrogen deprivation.". Biotechnology for Biofuels 6 (1): 67. doi:10.1186/1754-6834-6-67. PMID 23642220. 
  91. ↑ Wijffels, René H.; Barbosa, Maria J. (2010). "An Outlook on Microalgal Biofuels". Science 329 (5993): 796–799. doi:10.1126/science.1189003. PMID 20705853. Bibcode: 2010Sci...329..796W. 
  92. ↑ Read, Clare Sewell (1849). "On the Farming of South Wales: Prize Report". Journal of the Royal Agricultural Society of England 10: 142–143. https://books.google.com/books?id=UJYEAAAAYAAJ&pg=PA142. 
  93. ↑ McHugh, Dennis J. (2003). "9, Other Uses of Seaweeds". A Guide to the Seaweed Industry: FAO Fisheries Technical Paper 441. Rome: Fisheries and Aquaculture Department, Food and Agriculture Organization (FAO) of the United Nations. ISBN 978-92-5-104958-7. http://www.fao.org/DOCREP/006/Y4765E/y4765e0c.htm#TopOfPage. 
  94. ↑ Jung, Frederich; Kruger-Genge, Anne; Kupper, J.-H.; Waldeck, P (April 2019). "Spirulina platensis, a super food?" (in en). ResearchGate 5: 43. https://www.researchgate.net/publication/332594307. Retrieved 21 December 2020. 
  95. ↑ Simoons, Frederick J. (1991). "6, Seaweeds and Other Algae". Food in China: A Cultural and Historical Inquiry. CRC Press. pp. 179–190. ISBN 978-0-936923-29-1. 
  96. ↑ Morton, Steve L.. "Modern Uses of Cultivated Algae". Ethnobotanical Leaflets. Southern Illinois University Carbondale. http://www.siu.edu/~ebl/leaflets/algae.htm. 
  97. ↑ Mondragón, Jennifer; Mondragón, Jeff (2003). Seaweeds of the Pacific Coast. Monterey, California: Sea Challengers Publications. ISBN 978-0-930118-29-7. 
  98. ↑ "Durvillaea antarctica (Chamisso) Hariot". AlgaeBase. http://www.algaebase.org/speciesdetail.lasso?species_id=11752&sk=0&from=results&-session=abv3:51909EC30802716127sVj3EDC9C7. 
  99. ↑ "How marine algae could help feed the world". World Economic Forum. 25 October 2017. https://www.weforum.org/agenda/2017/10/how-marine-algae-could-help-feed-the-world. 
  100. ↑ "One solution to global hunger could be at the bottom of the ocean". World Economic Forum. 15 December 2017. https://www.weforum.org/agenda/2017/12/why-algae-and-seaweed-could-be-part-of-solving-the-global-hunger-crisis. 
  101. ↑ "Algae: Pond Scum or Food of the Future?". HowStuffWorks. 12 June 2018. https://science.howstuffworks.com/innovation/edible-innovations/algae-food-future.htm. 
  102. ↑ Rani, Komal; Sandal, Nidi; Sahoo, PK (2018). "A comprehensive review on chlorella- its composition, health benefits, market and regulatory scenario". The Pharma Innovation Journal 7 (7): 585. https://www.thepharmajournal.com/archives/2018/vol7issue7/PartJ/7-7-62-339.pdf. Retrieved 21 December 2020. 
  103. ↑ Bigogno, C.; Khozin-Goldberg, I.; Boussiba, S.; Vonshak, A.; Cohen, Z. (2002). "Lipid and fatty acid composition of the green oleaginous alga Parietochloris incisa, the richest plant source of arachidonic acid". Phytochemistry 60 (5): 497–503. doi:10.1016/S0031-9422(02)00100-0. PMID 12052516. Bibcode: 2002PChem..60..497B. https://www.researchgate.net/publication/11320290. 
  104. ↑ Aubrey, Allison (1 November 2007). "Getting Brain Food Straight from the Source". Morning Edition (NPR). https://www.npr.org/templates/story/story.php?storyId=15823852. 
  105. ↑ "Re-imagining algae". Australian Broadcasting Corporation. 12 October 2016. http://www.abc.net.au/radionational/programs/futuretense/re-imagining-algae/7926214-AU. 
  106. ↑ Morrissey, J.; Jones, M. S.; Harriott, V. (1988). "Nutrient cycling in the Great Barrier Reef Aquarium – Proceedings of the 6th International Coral Reef Symposium, Australia". ReefBase. http://www.reefbase.org/resource_center/publication/main.aspx?refid=10859. 
  107. ↑ Veraart, Annelies J.; Romaní, Anna M.; Tornés, Elisabet; Sabater, Sergi (2008). "Algal Response to Nutrient Enrichment in Forested Oligotrophic Stream". Journal of Phycology 44 (3): 564–572. doi:10.1111/j.1529-8817.2008.00503.x. PMID 27041416. Bibcode: 2008JPcgy..44..564V. http://www3.interscience.wiley.com/journal/120083425/abstract. 
  108. ↑ "Algae: A Mean, Green Cleaning Machine". USDA Agricultural Research Service. 7 May 2010. http://www.ars.usda.gov/is/AR/archive/may10/algae0510.htm. 
  109. ↑ "Algae Biopolymers, Companies, Production, Market – Oilgae – Oil from Algae". oilgae.com. http://www.oilgae.com/non_fuel_products/biopolymers.html. 
  110. ↑ "Renewable flip flops: scientists produce the 'No. 1' footwear in the world from algae". ZME Science. 9 October 2017. https://www.zmescience.com/science/algae-flip-flop/. 
  111. ↑ "World's First Algae Surfboard Makes Waves in San Diego". Energy.gov. https://www.energy.gov/eere/bioenergy/articles/world-s-first-algae-surfboard-makes-waves-san-diego. 
  112. ↑ Cappitelli, Francesca; Sorlini, Claudia (2008). "Microorganisms Attack Synthetic Polymers in Items Representing Our Cultural Heritage". Applied and Environmental Microbiology 74 (3): 564–569. doi:10.1128/AEM.01768-07. PMID 18065627. Bibcode: 2008ApEnM..74..564C. 
  113. ↑ Arad, Shoshana; Spharim, Ishai (1998). "Production of Valuable Products from Microalgae: An Emerging Agroindustry". in Altman, Arie. Agricultural Biotechnology. Books in Soils, Plants, and the Environment. 61. CRC Press. p. 638. ISBN 978-0-8247-9439-2. 
  114. ↑ Rathbun, C.; Doyle, A.; Waterhouse, T. (June 1994). "Measurement of Algal Chlorophylls and Carotenoids by HPLC". Joint Global Ocean Flux Study Protocols 13: 91–96. http://bats.bios.edu/methods/chapter13.pdf. Retrieved 7 July 2014. 
  115. ↑ Latasa, M.; Bidigare, R. (1998). "A comparison of phytoplankton populations of the Arabian Sea during the Spring Intermonsoon and Southwest Monsoon of 1995 as described by HPLC-analyzed pigments". Deep-Sea Research Part II 45 (10–11): 2133–2170. doi:10.1016/S0967-0645(98)00066-6. Bibcode: 1998DSRII..45.2133L. 

Bibliography

General

  • Chapman, V.J. (1950). Seaweeds and their Uses. London: Methuen. ISBN 978-0-412-15740-0. 
  • Fritsch, F. E. (1945). The Structure and Reproduction of the Algae. I & II. Cambridge University Press. 
  • van den Hoek, C.; Mann, D. G.; Jahns, H. M. (1995). Algae: An Introduction to Phycology. Cambridge University Press. 
  • Kassinger, Ruth (2020). Slime: How Algae Created Us, Plague Us, and Just Might Save Us. Mariner. 
  • Lembi, C. A.; Waaland, J.R. (1988). Algae and Human Affairs. Cambridge University Press. ISBN 978-0-521-32115-0. 
  • Mumford, T. F.; Miura, A. (1988). "Porphyra as food: cultivation and economic". in Lembi, C. A.; Waaland, J. R.. Algae and Human Affairs. Cambridge University Press. pp. 87–117. ISBN 978-0-521-32115-0. .
  • Round, F. E. (1981). The Ecology of Algae. London: Cambridge University Press. ISBN 978-0-521-22583-0. 
  • Smith, G. M. (1938). Cryptogamic Botany. I. New York: McGraw-Hill. https://archive.org/details/cryptogamicbotan031880mbp. 
  • Ask, E.I (1990). Cottonii and Spinosum Cultivation Handbook. FMC BioPolymer Corporation.Philippines. 

Regional

Britain and Ireland

  • Brodie, Juliet; Burrows, Elsie M.; Chamberlain, Yvonne M.; Christensen, Tyge; Dixon, Peter Stanley; Fletcher, R. L.; Hommersand, Max H.; Irvine, Linda M. et al. (1977–2003). Seaweeds of the British Isles: A Collaborative Project of the British Phycological Society and the British Museum (Natural History). London / Andover: British Museum of Natural History, HMSO / Intercept. ISBN 978-0-565-00781-2. 
  • Cullinane, John P. (1973). Phycology of the South Coast of Ireland. Cork: Cork University Press. 
  • Hardy, F. G.; Aspinall, R. J. (1988). An Atlas of the Seaweeds of Northumberland and Durham. The Hancock Museum, University Newcastle upon Tyne: Northumberland Biological Records Centre. ISBN 978-0-9509680-5-6. 
  • Hardy, F. G.; Guiry, Michael D.; Arnold, Henry R. (2006). A Check-list and Atlas of the Seaweeds of Britain and Ireland (Revised ed.). London: British Phycological Society. ISBN 978-3-906166-35-3. 
  • John, D. M.; Whitton, B. A.; Brook, J. A. (2002). The Freshwater Algal Flora of the British Isles. Cambridge / New York: Cambridge University Press. ISBN 978-0-521-77051-4. 
  • Knight, Margery; Parke, Mary W. (1931). Manx Algae: An Algal Survey of the South End of the Isle of Man. Liverpool Marine Biology Committee Memoirs on Typical British Marine Plants & Animals. XXX. Liverpool: University Press. 
  • Morton, Osborne (1994). Marine Algae of Northern Ireland. Belfast: Ulster Museum. ISBN 978-0-900761-28-7. 
  • Morton, Osborne (1 December 2003). "The Marine Macroalgae of County Donegal, Ireland". Bulletin of the Irish Biogeographical Society 27: 3–164. 

Australia

  • Huisman, J. M. (2000). Marine Plants of Australia. University of Western Australia Press. ISBN 978-1-876268-33-6. 

New Zealand

  • Chapman, Valentine Jackson; Lindauer, VW; Aiken, M.; Dromgoole, F. I. (1970). The Marine algae of New Zealand. London / Lehre, Germany: Linnean Society of London / Cramer. 

Europe

  • Cabioc'h, Jacqueline; Floc'h, Jean-Yves; Le Toquin, Alain; Boudouresque, Charles-François; Meinesz, Alexandre; Verlaque, Marc (1992) (in fr). Guide des algues des mers d'Europe: Manche/Atlantique-Méditerranée. Lausanne, Suisse: Delachaux et Niestlé. ISBN 978-2-603-00848-5. 
  • Gayral, Paulette (1966) (in fr). Les Algues de côtes françaises (manche et atlantique), notions fondamentales sur l'écologie, la biologie et la systématique des algues marines. Paris: Doin, Deren et Cie. 
  • Guiry, Michael. D.; Blunden, G. (1991). Seaweed Resources in Europe: Uses and Potential. John Wiley & Sons. ISBN 978-0-471-92947-5. 
  • Míguez Rodríguez, Luís (1998) (in gl). Algas mariñas de Galicia: Bioloxía, gastronomía, industria. Vigo: Edicións Xerais de Galicia. ISBN 978-84-8302-263-4. 
  • Otero, J. (2002) (in gl). Guía das macroalgas de Galicia. A Coruña: Baía Edicións. ISBN 978-84-89803-22-0. 
  • Bárbara, I.; Cremades, J. (1993) (in es). Guía de las algas del litoral gallego. A Coruña: Concello da Coruña – Casa das Ciencias. 

Arctic

  • Kjellman, Frans Reinhold (1883). The algae of the Arctic Sea: A survey of the species, together with an exposition of the general characters and the development of the flora. 20. Stockholm: Kungl. Svenska vetenskapsakademiens handlingar. pp. 1–350. 

Greenland

  • Lund, Søren Jensen (1959). The Marine Algae of East Greenland. Kövenhavn: C.A. Reitzel. 9584734. 

Faroe Islands

  • Børgesen, Frederik (1970). "Marine Algae". in Warming, Eugene. Botany of the Faröes Based Upon Danish Investigations, Part II. Copenhagen: Det nordiske Forlag. pp. 339–532. .

Canary Islands

  • Børgesen, Frederik (1936). Marine Algae from the Canary Islands. Copenhagen: Bianco Lunos. 

Morocco

  • Gayral, Paulette (1958) (in fr). Algues de la côte atlantique marocaine. Casablanca: Rabat [Société des sciences naturelles et physiques du Maroc]. 

South Africa

  • Stegenga, H.; Bolton, J. J.; Anderson, R. J. (1997). Seaweeds of the South African West Coast. Bolus Herbarium, University of Cape Town. ISBN 978-0-7992-1793-3. 

North America

External links



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