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Brief Summary

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“The precious red coral Corallium rubrum (L., 1758) lives in the Mediterranean Sea and adjacent Eastern Atlantic Ocean on subtidal hard substrates. Corallium rubrum is a long-lived gorgonian coral that has been commercially harvested since ancient times for its red axial calcitic skeleton and which, at present, is thought to be in decline because of overexploitation.” (Costantini et al., 2010)

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Conservation Status

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Likely over-harvested in its shallow-water habitats.

Listed by the European Commission on the Environment as “Annex V” = animal & plant species of community interest whose taking in the wild and exploitation may be subject to management measures.

(http://ec.europa.eu/environment/nature/legislation/habitatsdirective/index_en.htm).

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Diagnostic Description

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  • Branching colonies with rigid skeleton of intermeshed calcium carbonate spicules, colored red (or sometimes pink) by carotenoid pigments -- branching may be relatively sparse or quite dense, resulting in a bushy shape
  • In living colony, skeleton overlaid by soft-tissue integument
  • Short and hemispheric calyces distributed on branches
  • In living colonies, extended radially symmetrical polyps are translucent-white, with eight tentacles and fine pinnules but without sclerites

(Food & Agriculture Organization of the United Nations, 2011)

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Distribution

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Near shore waters of the Canary and Cape Verde islands, Morocco, Algeria, Tunisia, along the north coast of the Mediterranean Sea from western Greece to Spain, including Corsica, Sardinia and Sicily, and north into the Atlantic along the coast of Portugal (Zibrowius et al., 1984; UN-FAO, 2011).

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Ecology

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“…populations of this slow-growing long-lived octocoral exhibit a high capacity for colonization and seem to be quite resilient to environmental variability.” (Bramanti et al., 2005)

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Habitat

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Corallium rubrum lives on rocky substrates at depths from 20 to 200 m (or 15 to 300 m), generally in areas of relatively low light ((Zibrowius et al., 1984; Costantini et al., 2010; UN-FAO, 2011). Recently, however, live colonies have been found in the Strait of Sicily at depth of about 600 to 800 m (Costantini et al., 2010).

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Legislation

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The European Commission on the Environment has listed Corallium rubrum in Annex V of the Habitats Directive. Annex V = an “animal or plant species of community interest whose taking in the wild and exploitation may be subject to management measures” In 1994 the European Union banned the harvest of Corallium in the Mediterranean via dredging equipment.

(http://ec.europa.eu/environment/nature/legislation/habitatsdirective/index_en.htm).

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Life Cycle

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Long-lived and slow-growing – a few centimeters per year.

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Natural Enemies

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Populations of Corallium rubrum are infested by a variety of endobiotic boring sponges (UN-FAO, 2011).

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Threats

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Threats to populations of Corallium rubrum include water temperature anomalies, over-harvest, and destructive fishing practices. During the late summer of 1999, unusually high temperatures may have been the cause of both the mass mortality of the corals and the drastic reduction in settlement of new recruits (Bramanti et al., 2005). The popularity of Corallium rubrum in jewelry has resulted in the unsustainable harvest of easily accessible populations (Santiangelo & Abbiati, 2001; Oral, 2010). In addition, fishing practices like trawling damage or destroy the coral (Oral, 2010).

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Trophic Strategy

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Corallium rubrum is a passive suspension feeder, with a diet based on small zooplankton (UN-FAO, 2011). Feeding rates increase with water temperature and prey concentration, with an apparent preference for autotrophic flagellates (Picciano & Ferrier-Pagès, 2007).

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Uses

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Red coral has been used for thousands of years in jewelry and other ornamentation. Examples have been found from ancient Egypt and in graves in Wiesbaden, Germany from 25,000 years ago. It’s still very popular (and therefore, economically valuable) as jewelry and is also used by some who believe it’s effective as a homeopathic remedy for a variety of ailments.

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Diagnostic Description

provided by FAO species catalogs
Rigid colonies that may brach in all directions, giving a bushy shape. Calyces short and hemispherical distributed on the branches. Expanded polyps in living colonies are white, transparent, and with eight tentacles having fine pinnules, without sclerites. Polyps are retracted within calices once corals have been captured. Calcareous spicules (sclerites) from the crust, radially simmetricall, are warty with a short-stick shape. Colour: often dark red, sometimes and rarelly pink or even white.

References

  • Cicogna, F. & R. Cattaneo-Vietti1993 Red corals in the Mediterranean Sea. Art, history and science. Massa Lubrense. Roma. 263 pp.
  • Fischer, W. & M.L. Bauchot.1987FICHES FAO d'identification des especes pour les besoins de la Pêche. Méditerraneé et Mer Noire (zone de Pêche 37. Révision 1). Vol. I Invertebrés. Rome, FAO 766 pp.
  • Pérès, J.M. & J. Picard1964 Nouveau manuel de bionomie benthique de la mer Méditerranée. Recueil des Travaux de la Station Marine d'Endoume. 47(31): 1-137.
  • Santangelo, G., Abbiati, M., Giannini, F. & Cicogna, F.1993Red coral fishing trends in the western Mediterranean Sea during the period 1981-1991. Scientia Marina. 57: 139-143.
  • Zibrowius, H., Monteiro Marques, V. & Grasshoff, M.1984, La répartition du Corallium rubrum dans l'Atlantique (Cnidaria : Anthozoa : Gorgonaria). TÉTHYS. 11(2): 163-170

Distribution

provided by FAO species catalogs
Western and Eastern Mediterranean: from Greece and Tunisia to the the Straits of Gibraltar including Corsica, Sardinia and Sicily. Eastern Atlantic: South Portugal, Morocco, Canary and Cape Verd Islands.

Size

provided by FAO species catalogs
Some colonies attaining 20 cm hight. The base of the largest specimens can attain to 3 cm of diameter. An intensive exploitation reduced, however, the maximum size of colonnies.

Brief Summary

provided by FAO species catalogs
A rocky bottom species inhabiting depths with weak luminositymainly between 20-200 m depth.At their shallowest depth range distribution, it is characteristic of the Corallium rubrum facies in the biocenosis of semidark caves (Pérès and Picard, 1964). Coral exploitation is progressively restricting their occurrence at the deeper range of their bathymetric distribution. C. rubrum is an slow growing (a few centimetres per year) and long living species.Diet based on small zooplankton organisms captured with the help of the polyps tentacles.C. rubrum populations are infested by a variety of endobiotic boring sponges.

Benefits

provided by FAO species catalogs
Captured both dragging the bottom with a wooden cross provided with rope mops and by diving. The total catch reported for this species to FAO for 1999 was 26 5 t. The countries with the largest catches were Spain (6 9 t) and Italy (3 9 t). The red coral is famous because of the use of its calcified axis for jewellery.

Precious coral

provided by wikipedia EN

Precious coral, or red coral, is the common name given to a genus of marine corals, Corallium. The distinguishing characteristic of precious corals is their durable and intensely colored red or pink-orange skeleton, which is used for making jewelry.

Habitat

Red corals grow on rocky seabottom with low sedimentation, typically in dark environments—either in the depths or in dark caverns or crevices. The original species, C. rubrum (formerly Gorgonia nobilis), is found mainly in the Mediterranean Sea. It grows at depths from 10 to 300 meters below sea level, although the shallower of these habitats have been largely depleted by harvesting.[1] In the underwater caves of Alghero, Sardinia (the "Coral Riviera") it grows at depth from 4 to 35 meters. The same species is also found at Atlantic sites near the Strait of Gibraltar, at the Cape Verde Islands and off the coast of southern Portugal.[1] Other Corallium species are native to the western Pacific, notably around Japan and Taiwan;[2] these occur at depths of 350 to 1500 meters below sea level in areas with strong currents.[1]

Anatomy

In common with other Alcyonacea, red corals have the shape of small leafless bushes and grow up to a meter in height. Their valuable skeleton is composed of intermeshed spicules of hard calcium carbonate, colored in shades of red by carotenoid pigments.[1] In living specimens, the skeletal branches are overlaid with soft bright red integument, from which numerous retractable white polyps protrude.[3] The polyps exhibit octameric radial symmetry.

Species

The following are known species in the genus:[4]

As a gemstone

The Queen Farida of Egypt red coral parure by Ascione, made in 1938 in Naples, Coral Jewellery Museum
Chinese coral sculpture

The hard skeleton of red coral branches is naturally matte, but can be polished to a glassy shine.[2] It exhibits a range of warm reddish pink colors from pale pink to deep red; the word coral is also used to name such colors. Owing to its intense and permanent coloration and glossiness, precious coral skeletons have been harvested since antiquity for decorative use. Coral jewellery has been found in ancient Egyptian and prehistoric European burials,[3] and continues to be made to the present day. It was especially popular during the Victorian age.[5]

Precious coral has hardness 3.5 on the Mohs scale.[6] Due to its softness and opacity, coral is usually cut en cabochon, or used to make beads.[7]

History of trade

6-Strand Necklace, Navajo (Native American), ca. 1920s, Brooklyn Museum
Coral earrings.
Red coral precious raw gemstone

At the beginning of the 1st millennium, there was significant trade in coral between the Mediterranean and India, where it was highly prized as a substance believed to be endowed with mysterious sacred properties. Pliny the Elder remarks that, before the great demand from India, the Gauls used it for the ornamentation of their weapons and helmets; but by this period, so great was the Eastern demand, that it was very rarely seen even in the regions which produced it. Among the Romans, branches of coral were hung around children's necks to preserve them from danger from the outside, and the substance had many medicinal virtues attributed to it. The belief in coral's potency as a charm continued throughout the Middle Ages and early in 20th century Italy it was worn as a protection from the evil eye, and by women as a cure for infertility.

From the Middle Ages onward, the securing of the right to the coral fisheries off the African coasts was the object of considerable rivalry among the Mediterranean communities of Europe.

The story of the Torre del Greco is so interwoven with that of the coral so as to constitute an inseparable pair, and is documented as early as the fifteenth century. In 1790 the Royal Society of Coral was established in the town of Torre del Greco, with the idea of working and selling coral fish. This shows that the coral fishing flourished for many years in the city.

It was also enacted December 22, 1789, by Ferdinand IV of Bourbon Code coral (prepared by the Neapolitan jurist Michael Florio), with the intent to regulate the coral fishing in those years starring, in addition to the sailors Torre del Greco, the locals and those in Trapani This regulation did not have the expected success. From 1805, when he founded the first factory for the manufacturing of coral in Torre del Greco (by Paul Bartholomew Martin, but with French Genoese origin), the golden age for the manufacturing of coral in the city situated on the slopes of the Vesuvius started, because working together with the coral fishing was increasingly under the control of Torre del Greco fishermen. Since 1875, the Torre del Greco began working with the Sciacca coral and a school for the manufacturing of coral was built in 1878 in the city (which closed in 1885 to reopen in 1887), with which in 1933 established a museum of the coral. Then came the time of processing of Japanese coral found in the markets of Chennai and Kolkata.

Other story instead a short period the Tunisian fisheries were secured by Charles V for Spain; but the monopoly soon fell into the hands of the French, who held the right until the Revolutionary government in 1793 threw the trade open. For a short period (about 1806) the British government controlled the fisheries, but this later returned to the hands of the French authorities. Before the French Revolution much of the coral trade was centred in Marseille, but then largely moved to Italy, where the procuring of the raw material and the working of it was centring in Naples, Rome and Genoa.[8]

In culture

The origin of coral is explained in Greek mythology by the story of Perseus. Having petrified Cetus, the sea monster threatening Andromeda, Perseus placed Medusa's head on the riverbank while he washed his hands. When he recovered her head, he saw that her blood had turned the seaweed (in some variants the reeds) into red coral. Thus, the Greek word for coral is 'Gorgeia', as Medusa was one of the three Gorgons.[9]

Poseidon resided in a palace made of coral and gems, and Hephaestus first crafted his work from coral.

The Romans believed coral could protect children from harm, as well as cure wounds made by snakes and scorpions and diagnose diseases by changing colour.

  • In Hindu astrology red coral is associated with the planet Mars or Graha-Mangala and used for pleasing Mars. It should be worn on the ring finger.
  • A branch of red coral figures prominently in the civic coat of arms of the town of Alghero, Italy.
  • In Islam coral is mentioned as one of the gems in paradise.
  • Amongst the Yoruba and Bini peoples of West Africa, red precious coral jewellery (necklaces, wristlets and anklets most especially) are signifiers of high social rank, and are worn as a result by titled kings and chieftains.
  • In traditional Dutch culture, notably in fishing communities, red coral necklaces were worn by the female population as an indispensable part of the traditional costumes.[10]

Conservation

Intensive fishing, particularly in shallow waters, has damaged this species along the Mediterranean coastline, where colonies at depths of less than 50 metres are much diminished. Fishing and now climate change threaten their persistence. The three oldest Mediterranean marine protected areas—Banyuls, Carry-le-Rouet and Scandola, off the island of Corsica—all host substantial populations of C. rubrum. Since protection was established, colonies have grown in size and number at shallow and deeper depths.[11][12]

See also

References

  1. ^ a b c d "Corallium species". ARKive. Archived from the original on June 20, 2007. Retrieved February 15, 2007.
  2. ^ a b "Gemstones: Coral". Archived from the original on February 9, 2007. Retrieved February 15, 2007.
  3. ^ a b "Red Coral". Marenostrum. Retrieved February 15, 2007.
  4. ^ "WoRMS - World Register of Marine Species - Corallium Cuvier, 1798". Marinespecies.org. December 21, 2004. Retrieved October 9, 2013.
  5. ^ Anderson, Katharine (2008). "Coral Jewellery". Victorian Review. 34 (1): 47–52. doi:10.1353/vcr.2008.0008. JSTOR 41220397. S2CID 201782824.
  6. ^ "Jewelry Central". Retrieved February 15, 2007.
  7. ^ Balzan, Francesca; Deidun, Alan (2010). "Notes for a history of coral fishing and coral artefacts in Malta - The Significance of Coral: Apotropaic, Medical, Symbolic, Precious". In Joseph F. Grima (ed.). 60th anniversary of the Malta Historical Society: a commemoration. Zabbar: Veritas Press. pp. 435–454. ISBN 978-99932-0-942-3. OCLC 779340904. Archived from the original on March 25, 2019.
  8. ^ Chisholm, Hugh, ed. (1911). "Coral" . Encyclopædia Britannica. Vol. 7 (11th ed.). Cambridge University Press. p. 131.
  9. ^ "Ovid's Metamorphoses". Metamorphoses. Retrieved November 6, 2014.
  10. ^ "Traditional dutch red coral necklace". Retrieved August 24, 2022.
  11. ^ "Marine protected areas conserve Mediterranean red coral". Sciencedaily.com. May 11, 2010. Retrieved October 9, 2013.
  12. ^ Linares, C.; Bianchimani, O.; Torrents, O.; Marschal, C.; Drap, P.; Garrabou, J. (2010). "Marine Protected Areas and the conservation of long-lived marine invertebrates: The Mediterranean red coral". Marine Ecology Progress Series. 402: 69. Bibcode:2010MEPS..402...69L. doi:10.3354/meps08436. hdl:10261/79508.

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Precious coral: Brief Summary

provided by wikipedia EN

Precious coral, or red coral, is the common name given to a genus of marine corals, Corallium. The distinguishing characteristic of precious corals is their durable and intensely colored red or pink-orange skeleton, which is used for making jewelry.

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