Pamalican island with surrounding reef, Sulu Sea, Philippines.

A reef surrounding an islet.

In nautical terminology, a reef is a rock, sandbar, or other feature lying beneath the surface of the water (six fathoms or less beneath low water).

Many reefs result from abiotic processes—deposition of sand, wave erosion planning down rock outcrops, and other natural processes—but the best-known reefs are the coral reefs of tropical waters developed through biotic processes dominated by corals and calcareous algae. Artificial reefs such as shipwrecks are sometimes created to enhance physical complexity on generally featureless sand bottoms in order to attract a diverse assemblage of organisms, especially fish.

Biotic reef[link]

Coral Reefs in a beach in the city of Recife ("reef"), Brazil.

There are a variety of biotic reef types, including oyster reefs, but the most massive and widely distributed are tropical coral reefs. Although corals are major contributors to the framework and bulk material comprising a coral reef, the organisms most responsible for reef growth against the constant assault from ocean waves are calcareous algae, especially, although not entirely, species of coralline algae.

These biotic reef types take on additional names depending upon how the reef lies in relation to the land, if any. Reef types include fringing reef, barrier reefs, as well as atolls. A fringing reef is a reef that is attached to an island. A barrier reef forms a calcareous barrier around an island resulting in a lagoon between the shore and the reef. An atoll is a ring reef with no land present. The reef front (ocean side) is a high energy locale whereas the internal lagoon will be at a lower energy with fine grained sediments.

Geologic reef[link]

Definition[link]

Archeocyathids, the first reef building organisms, from the Poleta formation in the Death Valley area

Geologists define reefs and related terms (for example, bioherm, biostrome, carbonate mound) using the factors of depositional relief, internal structure, and biotic composition. There is no consensus on one universally applicable definition. A useful definition distinguishes reefs from mounds as follows. Both are considered to be varieties of organosedimentary buildups: sedimentary features, built by the interaction of organisms and their environment, that have synoptic relief and whose biotic composition differs from that found on and beneath the surrounding sea floor. Reefs are held up by a macroscopic skeletal framework. Coral reefs are an excellent example of this kind. Corals and calcareous algae grow on top of one another and form a three-dimensional framework that is modified in various ways by other organisms and inorganic processes. By contrast, mounds lack a macroscopic skeletal framework. Mounds are built by microorganisms or by organisms that don't grow a skeletal framework. A microbial mound might be built exclusively or primarily by cyanobacteria. Excellent examples of biostromes formed by cyanobacteria occur in the Great Salt Lake of Utah (USA), and in Shark Bay, Western Australia.

Cyanobacteria do not have skeletons and individuals are microscopic. Cyanobacteria encourage the precipitation or accumulation of calcium carbonate and can produce distinct sediment bodies in composition that have relief on the seafloor. Cyanobacterial mounds were most abundant before the evolution of shelly macroscopic organisms, but they still exist today (stromatolites are microbial mounds with a laminated internal structure). Bryozoans and crinoids, common contributors to marine sediments during the Mississippian (for example), produced a very different kind of mound. Bryozoans are small and the skeletons of crinoids disintegrate. However, bryozoan and crinoid meadows can persist over time and produce compositionally distinct bodies of sediment with depositional relief.

The Proterozoic Belt Supergroup contains evidence of possible microbial mat and dome structures similar to stromatolite reef complexes.^[1]

Geologic reef structures[link]

Reefs off Vanatinai in the Louisiade Archipelago.

Ancient reefs buried within stratigraphic sections are of considerable interest to geologists because they provide paleo-environmental information about the location in Earth's history. In addition, reef structures within a sequence of sedimentary rocks provide a discontinuity which may serve as a trap or conduit for fossil fuels or mineralizing fluids to form petroleum or ore deposits.

Corals, including some major extinct groups Rugosa and Tabulata, have been important reef builders through much of the Phanerozoic since the Ordovician Period. However, other organism groups, such as calcifying algae, especially members of the red algae Rhodophyta, and molluscs (especially the rudist bivalves during the Cretaceous Period) have created massive structures at various times. During the Cambrian Period, the conical or tubular skeletons of Archaeocyatha, an extinct group of uncertain affinities (possibly sponges), built reefs. Other groups, such as the Bryozoa have been important interstitial organisms, living between the framework builders. The corals which build reefs today, the Scleractinia, arose after the Permian–Triassic extinction event that wiped out the earlier rugose corals (as well as many other groups), and became increasingly important reef builders throughout the Mesozoic Era. They may have arisen from a rugose coral ancestor. Rugose corals built their skeletons of calcite and have a different symmetry from that of the scleractinian corals, whose skeletons are aragonite. However, there are some unusual examples of well preserved aragonitic rugose corals in the late Permian. In addition, calcite has been reported in the initial post-larval calcification in a few scleractinian corals. Nevertheless, scleractinian corals (which arose in the middle Triassic) may have arisen from a non-calcifying ancestor independent of the rugosan corals (which disappeared in the late Permian).

See also[link]

• Benjamin Kahn
• Reef Hobbyist Magazine

References[link]

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (July 2010)

• Shears N.T. (2007) Biogeography, community structure and biological habitat types of subtidal reefs on the South Island West Coast, New Zealand. Science for Conservation 281. p 53. Department of Conservation, New Zealand. [1]

External links[link]

Wikimedia Commons has media related to: Reefs

• Reef Rescue - Smithsonian Ocean Portal
• Coral Reefs of the Tropics: facts, photos and movies from The Nature Conservancy
• NOAA Photo Library
• Reef Environmental Education Foundation
• NOS Data Explorer - A portal to obtain NOAA National Ocean Service data

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There are many people in history who are commonly appended with the phrase "the Great", or who were called that or an equivalent phrase in their own language. Other languages have their own suffixes such as e Bozorg and e azam in Persian and Urdu respectively.

In Persia, the title "the Great" at first seems to be a colloquial version of the Old Persian title "Great King". This title was first used by the conqueror Cyrus II of Persia.^[1]

The Persian title was inherited by Alexander III of Macedon (336–323 BC) when he conquered the Persian Empire, and the epithet "Great" eventually became personally associated with him. The first reference (in a comedy by Plautus)^[2] assumes that everyone knew who "Alexander the Great" was; however, there is no earlier evidence that Alexander III of Macedon was called "the Great".

The early Seleucid kings, who succeeded Alexander in Persia, used "Great King" in local documents, but the title was most notably used for Antiochus the Great (223–187 BC).

Later rulers and commanders began to use the epithet "the Great" as a personal name, like the Roman general Pompey. Others received the surname retrospectively, like the Carthaginian Hanno and the Indian emperor Ashoka the Great. Once the surname gained currency, it was also used as an honorific surname for people without political careers, like the philosopher Albert the Great.

As there are no objective criteria for "greatness", the persistence of later generations in using the designation greatly varies. For example, Louis XIV of France was often referred to as "The Great" in his lifetime but is rarely called such nowadays, while Frederick II of Prussia is still called "The Great". A later Hohenzollern - Wilhelm I - was often called "The Great" in the time of his grandson Wilhelm II, but rarely later.

Rulers[link]

• Abbas I of Persia (1571–1629), Shah of Iran
• Akbar (1542–1605), ruler of the Mughal Empire of South Asia, mainly India
• Alain I of Albret (1440–1522), French aristocrat
• Alexander the Great (356-323 BC), King of Macedonia, Persia, Greece, Egypt, and all of Mesopotamia
• Alexander I of Georgia (1386–1446), King of Georgia
• Alfonso III of León (c. 848-910), King of León, Galicia and Asturias
• Alfred the Great (848/849-899), King of Wessex
• Antiochus III the Great (c. 241–187 BC), ruler of the Seleucid Empire
• Ashoka the Great (c. 304–232 BC), Indian emperor of the Maurya dynasty
• Ashot I of Iberia “the Great”(died 826/830), presiding prince of Iberia (modern Georgia),
• Askia Mohammad I (c. 1442–1538), ruler of the Songhai Empire
• Bhumibol Adulyadej (born 1927), King of Thailand
• Bolesław I Chrobry (967-1025), sometimes called "the Great", first King of Poland
• Bruno the Great (925–965), Archbishop of Cologne and Duke of Lotharingia (also listed in the following section)
• Buddha Yodfa Chulaloke (1736–1809), founder and ruler of the Rattanakosin Kingdom (in what is now Thailand)
• Cnut the Great (c. 985 or 995-1035), King of Denmark, England, Norway and parts of Sweden
• Casimir III the Great (1310–1370), King of Poland
• Catherine the Great (1729–1796), Empress of Russia
• Chandragupta II (reigned 375-413/415), also known as Vikramaditya, ruler of the Gupta empire in India
• Charlemagne (died 814), King of the Franks and Emperor of the Romans
• Chulalongkorn (1853–1910), King of Siam (now Thailand)
• Chlothar II (584-629), King of Neustria and King of the Franks
• Conrad, Margrave of Meissen (c. 1097-1157), Margrave of Meissen
• Constantine I (c. 272-337), Roman emperor
• Cyaxares the Great (c. 625-585 BC), third king of Media
• Cyrus the Great (c. 600 BC or 576 BC–530 BC), founder and ruler of the Persian or Achaemenid Empire
• Darius the Great (550 – 486 BC), third ruler of the Persian Empire
• Devapala (died 850), ruler of the Pala Empire in the Indian subcontinent
• Dionysius I, Greek tyrant of Syracuse^[3]
• Ferdinand I of León and Castile (c. 1015–1065), King of León and Count of Castile
• Frederick the Great (1712–1786), King of Prussia
• Genghis Khan (1162?-1227), founder and Great Khan of the Mongol Empire
• Gero (c. 900–965), ruler of Marca Geronis, a very large march in Europe
• Gustavus Adolphus of Sweden (1594–1632), King of Sweden, founder of the Swedish Empire, and noted military leader
• Gwanggaeto the Great, King of Goguryeo, one of the Three Kingdoms of Korea^[4][5]
• Hanno the Great, the name of three leaders of Carthage, in the 4th, 3rd, and 2nd centuries BC
• Henry I, Duke of Burgundy (946–1002)
• Henry IV of France (1553–1610), King of France and King of Navarre
• Herod the Great (73/74 BC-4 BC), King of Judea
• Hugh the Great (898-956), Duke of the Franks and Count of Paris
• Hugh Magnus of France (1007–1025), co-King of France
• Hugh I, Count of Vermandois (1057–1101)
• Humphrey I de Bohun (died c. 1123), Anglo-Norman aristocrat
• Ivan III of Russia (1440–1505), Tsar of Russia
• John I of Portugal (1358–1433), King of Portugal and the Algarve
• John II of Aragon (1398–1479), King of Aragon and, through his wife, King of Navarre
• Justinian I (483-565), Byzantine Emperor
• Kamehameha I (c. 1758-1819), first King of Hawai'i
• Kanishka (died c. 127), ruler of the Kushan Empire in Central Asia and parts of India
• Kvirike III of Kakheti (1010–1029), King of Kakheti in eastern Georgia
• Kublai Khan (1215–1294), Mongol ruler in the 13th century and Emperor of China; founder of the Yuan Dynasty
• Llywelyn the Great (c. 1172–1240), Prince of Gwynedd and de facto ruler of most of Wales
• Louis I of Hungary (1326–1382), King of Hungary, Croatia and Poland
• Mangrai the Great (1238–1317), Lanna, northern Thailand
• Emperor Meiji (1852–1912), Emperor of Japan
• Mircea I of Wallachia (1355–1418)
• Mithridates II of Parthia (died 88 BC), ruler of the Parthian Empire (in present day Iran)
• Mithridates VI of Pontus (134 BC–63 BC), ruler of Pontus and the Bosporan Kingdom
• Mstislav I of Kiev (1076–1132), Grand Prince of Kievan Rus
• Naresuan (1555–1605), King of Ayutthaya
• Narai (1633–1688), King of Ayutthaya (in what is now modern Thailand)
• Odo the Great (died c. 735), Duke of Aquitaine
• Otto I, Holy Roman Emperor (912-973)
• K'inich Janaab' Pakal (603-683), ruler of the Mayan city-state of Palenque
• Parakramabahu I of Polonnaruwa (1123–1186), King of Sri Lanka
• Peter Krešimir IV of Croatia (died 1075), King of Croatia
• Peter the Great (1672–1725), Tsar of Russia
• Peter III of Aragon (1239–1285), King of Aragon and King of Sicily
• Pompey (106 BC-48 BC), military and political leader of the late Roman Republic, rival of Julius Caesar
• Radama I (1793–1828), first king of greater Madagascar
• Raja Raja Chola I (c. 947-1014), Indian emperor of the Cholas.^[6][7][8]
• Rajendra Chola I (reigned 1014–1044), Tamil King of India
• Ramesses II (reigned 1279 BC – 1213 BC), considered the greatest pharaoh of Ancient Egypt
• Ram Khamhaeng (around 1237 to 1247-1298), King of Sukhothai (in present day Thailand)
• Ramon Berenguer III, Count of Barcelona (1082–1131), also Count of Provence and various other counties
• Rhodri the Great (c. 820–878), King of Gwynedd (in present day Wales)
• Roman the Great (after 1160-1205), Grand Prince of Kiev
• Saladin (c. 1138-1193), Kurdish Sultan of Egypt and Syria, founder of the Ayyubid dynasty, and victor over the Crusaders
• Samudragupta (c. 335–375), ruler of the Gupta empire in the Indian subcontinent
• Sancho III of Navarre (c. 992-1035), King of Kingdom of Navarre
• Sargon of Akkad (died c. 2215 BC), ruler of the Akkadian Empire
• Sejong the Great (1397–1450), Korean king^[9]
• Shapur II (309-379), king of the Sassanid Empire, Persia
• Simeon I of Bulgaria (864/865-927), ruler of the First Bulgarian Empire
• Stephen III of Moldavia (1433–1504), Prince of Moldavia (Romania)
• Stephen Uroš IV Dušan of Serbia (c. 1308-1355), King of Serbia and Emperor of the Serbs and Greeks
• Taksin (1734–1782), King of the Thonburi Kingdom (Thailand)
• Tamar (1160-1123), Queen of the Georgian Empire
• Timur (1336–1405), better known as Tamerlane, founder of the Timurid Dynasty
• Theobald II, Count of Champagne (1090–1151), Count of Blois and of Chartres as Theobald IV, Count of Champagne and of Brie
• Theodoric the Great (454-526), King of the Ostrogoths, regent of the Visigoths and a viceroy of the Byzantine Empire
• Theodosius I (347-395), Roman emperor
• Tigranes the Great (140-55 BC), Emperor of Armenia
• Tiridates III of Armenia (285-339), King of Armenia
• Umar (c. 586 to 590–644), second caliph of the Muslim Empire
• Valdemar I of Denmark (1131–1182), King of Denmark
• Valentinian I (364-375), Roman Emperor
• Vladimir I of Kiev (c. 958-1015), ruler of Kievan Rus
• Vytautas (c. 1350-1430), archduke of the Lithuanian Grand Duchy
• William I, Count of Burgundy (1020–1087), Count of Burgandy and Mâcon
• William V, Duke of Aquitaine (969-1030), also Count of Poitou
• Xerxes I (519-465 BC), King of Kings of the Achaemenid Empire (Persia)
• Yu the Great (c. 2200-2100 BC), legendary ruler in ancient China

Religious figures[link]

• Abraham the Great of Kashkar (ca. 492-586), monk and saint of the Assyrian Church of the East
• Abraham Kidunaia (died c. 366, hermit, priest, and Christian saint of Mesopotamia
• Albertus Magnus (1193/1206–1280), medieval German philosopher and theologian
• Anthony the Great (c. 251–356), early Christian saint of Egypt
• Babai the Great (c. 551–628), Assyrian church leader
• Basil of Caesarea (330-379), Greek bishop and theologian
• Bruno the Great (925–965), Archbishop of Cologne and Duke of Lotharingia (also listed in the previous section)
• Euthymius the Great (377-473), abbot and Roman Catholic and Eastern Orthodox saint
• Gertrude the Great (1256-c. 1302), German Benedictine, mystic, theologian and Roman Catholic saint
• Pope Gregory I (c. 540-604)
• Hiyya the Great, 3rd-century rabbi, Palestine
• Pope John Paul II (1920–2005)
• Pope Leo I (c. 391 or 400-461)
• Macarius of Egypt (c. 300-391), Egyptian hermit
• Pope Nicholas I (c. 800-867)
• Photius I of Constantinople (c. 810–c. 893), Eastern Orthodox saint and Patriarch of Constantinople
• William of Maleval (died 1157), founder of the Catholic congregation of Williamites

Other[link]

• Beli Mawr, a figure in medieval Welsh literature and genealogies
• Emmy the Great, folk singer
• Matteo Rosso the Great, Roman politician and father of Pope Nicholas III
• Prokop the Great, Hussite general in Bohemia

See also[link]

• Epithet
• List of monarchs by nickname
• List of nicknames of European Royalty and Nobility: G-I
• James, son of Zebedee, also known as James the Greater, one of the twelve apostles of Jesus
• Ajax (mythology), called Ajax the Greater
• Mohandas Karamchand Gandhi, whose common honorific "Mahatma" means "Great Soul"

Notes[link]