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Algae
Laurencia, a marine genus of Red Algae from Hawaii.
Scientific classification
Domain:	Eukaryota
Groups included
Archaeplastida Chlorophyta (Green algae) Rhodophyta (Red algae) Glaucophyta Rhizaria, Excavata Chlorarachniophytes Euglenids Chromista, Alveolata Heterokonts Bacillariophyceae (Diatoms) Axodine Bolidomonas Eustigmatophyceae Phaeophyceae (Brown algae) Chrysophyceae (Golden algae) Raphidophyceae Synurophyceae Xanthophyceae (Yellow-green algae) Cryptophyta Dinoflagellates Haptophyta
Cladistically included but traditionally excluded taxa
Cyanobacteria Plantae

Algae (Template:Pron-en or /ˈælɡiː/; singular alga /ˈælɡə/, Latin for "seaweed") are a large and diverse group of simple, typically autotrophic plants, ranging from unicellular to multicellular forms, such as the giant kelps that grow to 65 meters in length. The US Algal Collection is represented by almost 300,000 accessioned and inventoried herbarium specimens. The largest and most complex marine forms are called seaweeds. They are photosynthetic, like other plants, and "simple" because they lack the many distinct organs found in land plants.

Though the prokaryotic Cyanobacteria (commonly referred to as blue-green algae) were traditionally included as "algae" in older textbooks, many modern sources regard this as outdated as they are now considered to be closely related to bacteria. The term algae is now restricted to eukaryotic organisms. All true algae therefore have a nucleus enclosed within a membrane and plastids bound in one or more membranes. Algae constitute a paraphyletic and polyphyletic group, as they do not include all the descendants of the last universal ancestor nor do they all descend from a common algal ancestor, although their plastids seem to have a single origin. Diatoms are also examples of algae.

Algae are found in the fossil record dating back to approximately 3 billion years in the Precambrian. They exhibit a wide range of reproductive strategies, from simple, asexual cell division to complex forms of sexual reproduction.

Algae lack the various structures that characterize land plants, such as phyllids (leaves) and rhizoids in nonvascular plants, or leaves, roots, and other organs that are found in tracheophytes (vascular plants). Many are photoautotrophic, although some groups contain members that are mixotrophic, deriving energy both from photosynthesis and uptake of organic carbon either by osmotrophy, myzotrophy, or phagotrophy. Some unicellular species rely entirely on external energy sources and have limited or no photosynthetic apparatus.

Nearly all algae have photosynthetic machinery ultimately derived from the Cyanobacteria, and so 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.

Etymology and study

The singular alga is the Latin word for a particular seaweed and retains that meaning in English. The etymology is obscure. Although some speculate that it is related to Latin algēre, "be cold", there is no known reason to associate seaweed with temperature. A more likely source is alliga, "binding, entwining." Since Algae has become a biological classification, alga can also mean one classification under Algae, parallel to a fungus being a species of fungi, a plant being a species of plant, and so on.

The ancient Greek word for seaweed was φῦκος (fūkos or phykos), 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, blue.

Accordingly the modern study of marine and freshwater algae is called either phycology or algology. The name Fucus appears in a number of taxa.

Classification

While Cyanobacteria have been traditionally included among the Algae, recent works usually exclude them due to large differences such as the lack of membrane-bound organelles, the presence of a single circular chromosome, the presence of peptidoglycan in the cell walls, and ribosomes different in size and content from those of the Eukaryotes. Rather than in chloroplasts, they conduct photosynthesis on specialized infolded cytoplasmic membranes called thylakoid membranes. Therefore, they differ significantly from the Algae despite occupying similar ecological niches.

By modern definitions Algae are Eukaryotes and conduct photosynthesis within membrane-bound organelles called chloroplasts. Chloroplasts contain circular DNA and are similar in structure to Cyanobacteria, presumably representing reduced cyanobacterial endosymbionts. The exact nature of the chloroplasts is different among the different lines of Algae, reflecting 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.

Phylogeny based on plastid. not nucleocytoplasmic genealogy:

W.H.Harvey (1811—1866) was the first to divide the 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 (Rhodophyta), Brown Algae (Heteromontophyta), Green Algae (Chlorophyta) and Diatomaceae.

Relationship to higher plants

The first plants on earth evolved from shallow freshwater algae much like Chara some 400 million years ago. These probably had an isomorphic alternation of generations and were probably filamentous. Fossils of isolated land plant spores suggest land plants may have been around as long as 475 million years ago.

Morphology

A range of algal morphologies are 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. Apical growth is constrained to subsets of these groups: the florideophyte reds, various browns, and the charophytes. The form of charophytes is quite different to those of reds and browns, because have distinct nodes, separated by internode 'stems'; whorls of branches reminiscent of the horsetails occur at the nodes. Conceptacles are another polyphyletic trait; they appear in the coralline algae and the Hildenbrandiales, as well as the browns.

Most of the simpler algae are unicellular flagellates or amoeboids, but colonial and non-motile 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 life cycle 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: non-motile cells embedded in mucilage
• Filamentous: a string of non-motile cells connected together, 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,—some of which may reach 50 m in length (kelps)—the red algae, and the green algae. The most complex forms are found among the green algae (see Charales and Charophyta), in a lineage that eventually led to the higher land plants. The point where these non-algal plants begin and algae stop is usually taken to be the presence of reproductive organs with protective cell layers, a characteristic not found in the other alga groups.

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 as follows.

Lichens

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." The fungi, or mycobionts, are from the Ascomycota with a few from the Basidiomycota. They are not found alone in nature but when they began to associate is not known. One mycobiont associates with the same phycobiont species, rarely two, from the Green Algae, except that alternatively the mycobiont may associate with the same species of Cyanobacteria (hence "photobiont" is the more accurate term). A photobiont may be associated with many specific mycobionts or live independently; accordingly, lichens are named and classified as fungal species. 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). It is possible that the photobiont triggers otherwise latent genes in the mycobiont.

Coral reefs

Coral reefs are accumulated from the calcareous exoskeletons of marine invertebrates of the Scleractinia order; i.e., the Stony Corals. As animals they metabolize sugar and oxygen to obtain energy for their cell-building processes, including secretion of the exoskeleton, with water and carbon dioxide as byproducts. As the reef is the result of a favorable equilibrium between construction by the corals and destruction by marine erosion, the rate at which metabolism can proceed determines the growth or deterioration of the reef.

Algae of the Dinoflagellate phylum are often endosymbionts in the cells of marine invertebrates, where they accelerate host-cell metabolism by generating immediately available sugar and oxygen through photosynthesis using incident light and the carbon dioxide produced in the host. Endosymbiont algae in the Stony Corals are described by the term zooxanthellae, with the host Stony Corals called on that account hermatypic corals, which although not a taxon are not in healthy condition without their endosymbionts. Zooxanthellae belong almost entirely to the genus Symbiodinium. The loss of Symbiodinium from the host is known as coral bleaching, a condition which unless corrected leads to the deterioration and loss of the reef.

Sea sponges

Green Algae live close to the surface of some sponges, for example, breadcrumb sponge (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.

Life-cycle

Rhodophyta, Chlorophyta and Heterokontophyta, the three main algal Phyla, have life-cycles which show tremendous variation with considerable complexity. In general there is an asexual phase 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 is advantageous in that it permits efficient population increases, but less variation is possible. Sexual reproduction allows more variation, but is more costly. Often there is no strict alternation between the sporophyte and also because there is often an asexual phase, which could include the fragmentation of the thallus.

Numbers

The Algal Collection of the U.S. National Herbarium (located in the National Museum of Natural History) consists of approximately 320500 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). Estimates vary widely. For example, according to one standard textbook, in the British Isles the UK Biodiversity Steering Group Report estimated there to be 20000 algal species in the UK. Another checklist reports only about 5000 species. Regarding the difference of about 15000 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: 5000—5500 species of Red Algae worldwide, "some 1300 in Australian Seas," 400 seaweed species for the western coastline of South Africa, 669 marine species from California (U.S.A.), 642 in the check-list of Britain and Ireland, 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 the microscopic Algae, such as the phytoplankta, entirely.

Distribution

The topic of distribution of algal species has been fairly well studied since the founding of phytogeography in the mid-19th century AD. Algae spread mainly by the dispersal of spores analogously to the dispersal of Plantae by seeds and spores. Spores are everywhere in all parts of the Earth: the waters fresh and marine, the atmosphere, free-floating and in precipitation or mixed with dust, the humus and in other organisms, such as humans. Whether a spore is to grow into an organism depends on the combination of the species and the environmental conditions of where the spore lands.

The spores of fresh-water Algae are dispersed mainly by running water and wind, as well as by living carriers. The bodies of water into which they are transported are chemically selective. Marine spores are spread by currents. Ocean water is temperature selective, resulting in phytogeographic zones, regions and provinces.

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, it is usually possible to hypothesize a transport mechanism, such as the hulls of ships. For example, Ulva reticulata and Ulva 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." For example, Clathromorphum is an arctic genus and is not mapped far south of there. On the other hand, scientists regard the overall data as insufficient due to the "difficulties of undertaking such studies."

Locations

Algae are prominent in bodies of water, common in terrestrial environments and are found in unusual environments, such as on snow and on ice. Seaweeds grow mostly in shallow marine waters, under 100 metres (330 ft); however some have been recorded to a depth of 360 metres (1,180 ft)

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 are variously sensitive to different factors, which has made them useful as biological indicators in the Ballantine Scale and its modification.

Uses

Agar

Agar, a gelatinous substance derived from red algae, has a number of commercial uses.

Alginates

Between 100,000 and 170,000 wet tons of Macrocystis are harvested annually in California for alginate extraction and abalone feed.

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, 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 should be within reach in about ten years.

Fertilizer

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:

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. 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

Naturally growing seaweeds are an important source of food, especially in Asia. They provide many vitamins including: A, B₁, B₂, B₆, niacin and C, and are rich in iodine, potassium, iron, magnesium and calcium. In addition commercially cultivated microalgae, including both Algae and Cyanobacteria, are marketed as nutritional supplements, such as Spirulina, Chlorella and the Vitamin-C supplement, 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; Ireland, dulse; Chile, cochayuyo. Laver is used to make "laver bread" in Wales where it is known as bara lawr; in Korea, gim; in Japan, nori and aonori. 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 a salad ingredient in Scotland, Ireland, Greenland and Iceland.

The oils from some Algae have high levels of unsaturated fatty acids. For example, Parietochloris incisa is very high in arachidonic acid, where it reaches up to 47% of the triglyceride pool. 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), in addition to vitamin B₁₂. The vitamin B₁₂ in algae is not biologically active. 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. Algae has 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, reducing the need for greater amounts of toxic chemicals than are already used.
• Algae can be used to capture fertilizers in runoff from farms. When subsequently harvested, the enriched algae itself can be used as fertilizer.

Agricultural Research Service scientists found that 60-90% of nitrogen runoff and 70-100% of phosphorus runoff can be captured from manure effluents using an algal turf scrubber (ATS). Scientists developed the ATS, which are 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. The enriched algae itself also can be used as a fertilizer. 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.

Pigments

The natural pigments produced by algae can be used as an alternative to chemical dyes and coloring agents.

Stabilizing substances

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

See also

• Algaculture
• AlgaeBase
• AlgaePARC
• Anatoxin
• Microalgae
• Microphyte
• Nutrition
• Photobioreactor
• Phytoplankton
• Plant

Notes

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2. ^ Laura Wegener Parfrey, Erika Barbero, Elyse Lasser, Micah Dunthorn, Debashish Bhattacharya, David J Patterson, and Laura A Katz (December 2006). "Evaluating Support for the Current Classification of Eukaryotic Diversity". PLoS Genet. 2 (12): e220. doi:10.1371/journal.pgen.0020220. PMC 1713255. PMID 17194223.{{cite journal}}: CS1 maint: multiple names: authors list (link) CS1 maint: unflagged free DOI (link)
3. Smithsonian National Museum of Natural History; Department of Botany. http://botany.si.edu/projects/algae/
4. ^ Nabors, Murray W. (2004). Introduction to Botany. San Francisco, CA: Pearson Education, Inc. ISBN 0805344160.
5. Ed. Guiry, M.D., John, D.M., Rindi, F and McCarthy, T.K. 2007. New Survey of Clare Island Volume 6: The Freshwater and Terrestrial Algae. Royal Irish Academy. isbn 13: 978-1-904890-31-7
6. Allaby, M ed. (1992). "Algae". The Concise Dictionary of Botany. Oxford: Oxford University Press. {{cite encyclopedia}}: |first= has generic name (help)
7. Round (1981)
8. Smithsonian National Musem of Natural History; Department of Botany. http://botany.si.edu/projects/algae/introduction.htm
9. Attention: This template ({{cite pmid}}) is deprecated. To cite the publication identified by PMID 19416859, please use {{cite journal}} with |pmid=19416859 instead.
10. "alga, algae". Webster's Third New International Dictionary of the English Language Unabridged with Seven Language Dictionary. Vol. 1. Encyclopedia Britannica, Inc. 1986.
11. Partridge, Eric (1983). "algae". Origins.
12. Lewis, Charlton T. (1879). alga. Oxford: Clarendon Press. ISBN 0-19-864201-6. {{cite encyclopedia}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
13. Cheyne, Thomas Kelly (1899–1903). "Paint". Encyclopædia Biblica–A Dictionary of the Bible. Vol. 3. New York: Macmillan Co. pp. 3524–3525. {{cite encyclopedia}}: Unknown parameter |coauthors= ignored (|author= suggested) (help) Downloadable Google Books.
14. ^ Losos, Jonathan B. (2007). Biology (8 ed.). McGraw-Hill. ISBN 0073041106. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
15. Jochem, Frank J. "Botany 4404 Lecture Notes". Florida International University (FIU). Retrieved 2008-12-20.
16. Bhattacharya, D.; Medlin, L. (1998). "Algal Phylogeny and the Origin of Land Plants" (PDF). Plant Physiology. 116 (1): 9–15. doi:10.1104/pp.116.1.9.
17. Burki F, Shalchian-Tabrizi K, Minge M, Skjæveland Å, Nikolaev SI; et al. (2007). "Phylogenomics Reshuffles the Eukaryotic Supergroups". PLoS ONE. 2 (8: e790): e790. doi:10.1371/journal.pone.0000790. PMC 1949142. PMID 17726520. {{cite journal}}: Explicit use of et al. in: |author= (help)CS1 maint: multiple names: authors list (link) CS1 maint: unflagged free DOI (link)
18. Dixon, P S (1973). Biology of the Rhodophyta. Edinburgh: Oliver & Boyd. p. 232. ISBN 005002485X.
19. Ivan Noble (18 September 2003). "When plants conquered land". BBC.
20. Wellman, C.H. (2003). "Fragments of the earliest land plants". Nature. 425 (6955): 282–285. doi:10.1038/nature01884. PMID 13679913. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
21. ^ 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.
22. Waggoner, Ben (1994–2008). "Introduction to the Phaeophyta: Kelps and brown "Algae"". University of California Museum of Palaeontology (UCMP). Retrieved 2008-12-19.
23. ^ Thomas, D N (2002). Seaweeds. London: The Natural History Museum. ISBN 0565091751.
24. Waggoner, Ben (1994–2008). "Introduction to the Rhodophyta, The red "algae"". University of California Museum of Palaeontology (UCMP). Retrieved 2008-12-19.
25. Introduction to the Green Algae
26. Brodo, Irwin M; Sharnoff, Sylvia Duran; Sharnoff, Stephen; Laurie-Bourque, Susan (2001). Lichens of North America. New Haven: Yale University Press. p. 8. ISBN 0300082495, 9780300082494. {{cite book}}: Check |isbn= value: invalid character (help)
27. Pearson, Lorentz C (1995). The Diversity and Evolution of Plants. CRC Press. p. 221. ISBN 0849324831, 9780849324833. {{cite book}}: Check |isbn= value: invalid character (help)
28. Brodo et al. (2001), page 6: "A species of lichen collected anywhere in its range has the same lichen-forming fungus and, generally, the same photobiont. (A particular photobiont, on the other hand, may associate with scores of different lichen fungi)."
29. Brodo et al. (2001), page 8.
30. Taylor, Dennis L (1983). "The coral-algal symbiosis". In Goff, Lynda J (ed.). Algal Symbiosis: A Continuum of Interaction Strategies. CUP Archive. pp. 19–20. ISBN 0521255414, 9780521255417. {{cite book}}: Check |isbn= value: invalid character (help)
31. http://uwsp.edu/cnr/UWEXlakes/laketides/vol26-4/vol26-4.pdf
32. Lobban, C S and Harrison, P J (1997) Seaweed Ecology and Physiology. Cambridge University Press. ISBN 0-521-40897-00
33. Algae II
34. "Algae Herbarium". National Museum of Natural History, Department of Botany. 2008. Retrieved 2008-12-19.
35. John (2002), page 1.
36. Huisman (2000), page 25.
37. Stegenga (1997).
38. Abbott and Hollenberg (1976), page 2.
39. Hardy and Guiry (2006).
40. Round (1981), Chapter 8, Dispersal, continuity and phytogeography.
41. Round (1981), page 360.
42. Round (1981), page 362.
43. Round (1981), Page 357.
44. Round (1981), page 371.
45. Round (1981), page 366.
46. Round (1981), page 176.
47. Lewis, J G; Stanley, N F; Guist, G G (1988). "9 Commercial production of algal hydrocolloides". In Lembi, C.A.; Waaland, J.R. (eds.). Algae and Human Affairs. Cambridge University Press. ISBN 9780521321150. {{cite book}}: Unknown parameter |city= ignored (|location= suggested) (help)
48. "Macrocystis C. Agardh 1820: 46". AlgaeBase. Retrieved 2008-12-28.
49. "Secondary Products of Brown Algae". Algae Research. Smithsonian National Museum of Natural History. Retrieved 2008-12-29.
50. Read, Clare Sewell (1849). "On the Farming of South Wales: Prize Report". Journal of the Royal Agricultural Society of England. 10. John Murray: 142–143. {{cite journal}}: Unknown parameter |city= ignored (|location= suggested) (help) Downloadable Google Books.
51. 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 9251049580, ISBN 0499345. {{cite book}}: Check |isbn= value: invalid character (help)
52. Simoons, Frederick J (1991). "6, Seaweeds and Other Algae". Food in China: A Cultural and Historical Inquiry. CRC Press. pp. 179–190. ISBN 0936923296.
53. Morton, Steve L. "Modern Uses of Cultivated Algae". Ethnobotanical Leaflets. Southern Illinois University Carbondale. Retrieved 2008-12-26.
54. Mondragon, J (2003). Seaweeds of the Pacific Coast. Monterey, California: Sea Challengers Publications. ISBN 0930118294. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
55. "Durvillaea antarctica (Chamisso) Hariot". AlgaeBase.
56. Bigogno, C (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. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
57. Allison Aubrey (Morning Edition, November 1, 2007). "Getting Brain Food Straight from the Source". National Public Radio. {{cite news}}: Check date values in: |date= (help)
58. "Algae: A Mean, Green Cleaning Machine". USDA Agricultural Research Service. May 7, 2010.
59. http://www.ars.usda.gov/is/pr/2010/100507.htm
60. Arad, Shoshana; Spharim, Ishai (1998). "Production of Valuable Products from Microalgae: An Emerging Agroindustry". In Altman, Arie (ed.). Agricultural Biotechnology. Books in Soils, Plants, and the Environment. Vol. 61. CRC Press. p. 638. ISBN 0824794397, 9780824794392. {{cite book}}: Check |isbn= value: invalid character (help)

Bibliography

General

• Chapman, V.J. (1950). Seaweeds and their Uses. London: Methuen & Co. Ltd. ISBN 0412157403.
• Lembi, C.A.; Waaland, J.R. (1988). Algae and Human Affairs. Cambridge: Cambridge University Press. ISBN 0521321158.
• Round, F E (1981). The Ecology of Algae. London: Cambridge University Press. ISBN 0521225833.
• Mumford, T F; Miura, A (1988). "Porphyra as food: cultivation and economic". In Lembi, C A; Waaland, J R (eds.). Algae and Human Affairs. Cambridge University Press. pp. 87–117. ISBN 0521321158..

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; Maggs, Christine A (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 (Natural History), HMSO, Intercept. ISBN 0565007815, 9780565007812, 0113100450, 9780113100453, 0113100167, 9780113100163, 1898298874, 9781898298878, 056500980X, 9780565009809, 0565009818, 0565009923, 0565008714. {{cite book}}: Check |isbn= value: invalid character (help)
• 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 0950968056, 9780950968056. {{cite book}}: Check |isbn= value: invalid character (help)
• 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 3-906166-35-X 9783906166353. {{cite book}}: Check |isbn= value: length (help)
• John, D M; Whitton, B A; Brook, J A (2002). The Freshwater Algal Flora of the British Isles. Cambridge, UK; New York: Cambridge University Press. ISBN 0521770513.
• Knight, Margery; Parke, Mary W (1931). Manx Algae: An Algal Survey of the South End of the Isle of Man. Liverpool Marine Biology Committee (LMBC) Memoirs on Typical British Marine Plants & Animals. Vol. XXX. Liverpool: University Press.
• Morton, Osborne (1994). Marine Algae of Northern Ireland. Belfast: Ulster Museum. ISBN 0900761288 9780900761287. {{cite book}}: Check |isbn= value: length (help)
• 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 Australian (UWA) Press. ISBN 1876268336.

New Zealand

• Chapman, Valentine Jackson; Lindauer, VW; Aiken, M; Dromgoole, FI (1900, 1956, 1961, 1969, 1970). The Marine algae of New Zealand. London; Lehre, Germany: Linnaean Society of London; Cramer. {{cite book}}: Check date values in: |date= (help)

Europe

• Cabioc'h, Jacqueline; Floc'h, Jean-Yves; Le Toquin, Alain; Boudouresque, Charles-François; Meinesz, Alexandre; Verlaque, Marc (1992). Guide des algues des mers d'Europe: Manche/Atlantique-Méditerranée (in French). Lausanne, Suisse: Delachaux et Niestlé. ISBN 2-603-00848-X, 9782603008485. {{cite book}}: Check |isbn= value: invalid character (help)
• Gayral, Paulette (1966). Les Algues de côtes françaises (manche et atlantique), notions fondamentales sur l'écologie, la biologie et la systématique des algues marines (in French). Paris: Doin, Deren et Cie.
• Guiry, M.D.; Blunden, G. (1991). Seaweed Resources in Europe: Uses and Potential. John Wiley & Sons. ISBN 0471929476.
• Míguez Rodríguez, Luís (1998). Algas mariñas de Galicia: bioloxía, gastronomía, industria (in Galician). Vigo: Edicións Xerais de Galicia. ISBN 84-8302-263-X.{{cite book}}: CS1 maint: unrecognized language (link)
• Otero, J. (2002). Guía das macroalgas de Galicia (in Galician). A Coruña: Baía Edicións. ISBN 84-89803-22-6.{{cite book}}: CS1 maint: unrecognized language (link)
• Bárbara, I.; Cremades, J. (1993). Guía de las algas del litoral gallego (in Spanish). 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. Vol. 20. Stockholm: Kungl. Svenska vetenskapsakademiens handlingar. pp. 1–350. {{cite book}}: Unknown parameter |part= ignored (help)

Greenland

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

Faroe Islands

• Børgesen, Frederik (1903, 1970 reprint). "Marine Algae". In Warming, Eugene (ed.). Botany of the Faröes Based Upon Danish Investigations. Part II. Det nordiske Forlag. pp. 339–532. {{cite book}}: Check date values in: |date= (help); Unknown parameter |city= ignored (|location= suggested) (help).

Canary Islands

• Børgesen, Frederik (1925, 1926, 1927, 1929, 1930, 1936). Marine Algae from the Canary Islands. København: Bianco Lunos. {{cite book}}: Check date values in: |date= (help)

Morocco

• Gayral, Paulette (1958). Algues de la côte atlantique marocaine (in French). Casablanca: Rabat .

South Africa

• Stegenga, H. (1997). Seaweeds of the South African West Coast. Bolus Herbarium, University of Cape Town. ISBN 0-7992-1793-X. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

North America

• Abbott, I.A. (1976). Marine Algae of California. California: Stanford University Press. ISBN 0804708673. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
• Greeson, Phillip E. (1982). An annotated key to the identification of commonly occurring and dominant genera of Algae observed in the Phytoplankton of the United States. Washington, D.C.: U.S. Department of the Interior, Geological Survey. Retrieved 2008-12-19.
• Taylor, William Randolph (1937, 1957, 1962, 1969). Marine Algae of the Northeastern Coast of North America. Ann Arbor: University of Michigan Press. ISBN 0472049046. {{cite book}}: Check date values in: |date= (help)
• Wehr, J D; Sheath, R G (2003). Freshwater Algae of North America: Ecology and Classification. USA: Academic Press. ISBN 0127415505.

External links

• Guiry, Michael and Wendy. AlgaeBase "AlgaeBase". {{cite web}}: Check |url= value (help) - a database of all algal names including images, nomenclature, taxonomy, distribution, bibliography, uses, extracts
• Algae - Cell Centered Database
• "Algae Research". National Museum of Natural History, Department of Botany. 2008. Retrieved 2008-12-19.
• Anderson, Don (2007). "Harmful Algae". U.S. National Office for Harmful Algal Blooms. Retrieved 2008-12-19. {{cite web}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
• "Australian Freshwater Algae (AFA)". Department of Environment and Climate Change NSW Botanic Gardens Trust. Retrieved 2008-12-19.
• "Monterey Bay Flora". Monterey Bay Aquarium Research Institute (MBARI). 1996–2008. Retrieved 2008-12-20.
• Silva, Paul (1997–2004). "Index Nominum Algarum (INA)". Berkeley: University Herbarium, University of California. Retrieved 2008-12-19.
• Algae: Protists with Chloroplasts
• "Research on microalgae". Wageningen UR. 2009. Retrieved 2009-05-18.

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Techniques	Destructive fishing practices Fish trap Fishfinder Fishing net Gathering seafood by hand Handline fishing Spearfishing Trawling Trolling
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Locations	Fish ponds Fishing banks Fishing villages Marine habitats
Crime	Bering Sea Anti-Poaching Operations Coral poaching Freshwater eel poaching and smuggling Illegal, unreported and unregulated fishing Arctic
Glossary Index Outline Category

• Algae