Posidonia oceanica is een plantensoort die veel voorkomt langs de rotskusten van de Middellandse Zee.De soort staat op de Rode Lijst van de IUCN geklasseerd als 'niet bedreigd'.. Kenmerken. [citation needed], The flowering plant's common name is Neptune grass. Posidonia is a genus of flowering plants. The sea beds of Ibiza and Formentera are home to the largest living organisms in the world - large sea grass meadows of Posidonia oceanica, eight kilometers long and over 100,000 years old.It was declared a World Heritage by the UNESCO.. Posidonia oceanica is a higher plant species and it differs from algae in that it has leaves, stalks and roots as well as flowers and fruit. These settlements, together with the Posidonia oceanica seagrass meadows between Ibiza and Formentera, were declared UNESCO World Heritage Sites in 1999. Posidonia Oceanica predominates throughout the Mediterranean but in the area of Ibiza and Formentera is probably the biggest protagonist of the sea. The rhizome type stems are found in two forms: one growing up to 150 centimetres (59 in) beneath the sand and the other rising above the sand. Unfortunately the Posidonia Oceanica is a species in danger of extinction, for this reason it is important to know that the leaves used from this plant have never been torn from the sea! Posidonia oceanica, a World Heritage Site Since December 4, 1999, Ibiza is part of the UNESCO World Heritage catalog, forming part of an exclusive world club of which Spain is the most prominent English – Characteristics and importance of the meadows. Subsurface rhizomes and roots stabilize the plant while erect rhizomes and leaves reduce silt accumulation. It is a key element to preserve the Mediterranean ecosystems. Asexual reproduction has also been observed from whole tufts ripped out during storms which take root in a new location when the required conditions are met. All stems are approximately 10 millimetres (0.39 in) thick and upright in habit. Praderas de Posidonia Oceánica A pesar de la situación en el mapa, cabe destacar que las praderas se extienden por una gran extensión, que incluye las áreas que rodean las islas de Ibiza y Formentera. Please visit our websiteLegal Notefor more information about cookies and how we use them. Es una especie endémica del Mediterráneo y, desde el año 1999, concretamente, la pradera del Parque Natural de las Salinas de Ibiza y Formentera fué declarada Patrimonio de la Humanidad. Posidonia meadows can live up to 60 years. Such plant material has been used for composting, but Italian laws prohibit the use of marine algae and plants for this purpose. Posidonia oceanica is a flowering plant which lives in dense meadows or along channels in the sands of the Mediterranean. The fruit is free floating and known in Italy as "the olive of the sea" (l'oliva di mare[2]). Its presence in the water is beneficial because … Among their many functions, Posidonia oceanica meadows play a part in stabilizing seabeds, breaking swells and waves, and encouraging the deposit of sedimentary particles (Boudouresque et al., 2006). Is it an algae? Posidonia grows best in clean waters, and its presence is a marker for lack of pollution. Do not translate text that appears unreliable or low-quality. The flowers, peculiar and inconspicuous, are hermaphroditic (they have male and female sexual organs). Balls of fibrous material from its foliage, known as egagropili, wash up to nearby shorelines. And, as many of you already know, this is thanks to the presence of the wonderful Posidonia plant on the Balearic coasts. Seagrass meadows are threatened in a number of ways. What is its function? Posidonia ONLY lives in the Mediterranean sea and is believed to be 10 thousands of years old. The APG system (1998) and APG II system (2003) accept the genus as constituting the sole genus in the family Posidoniaceae, which it places in the order Alismatales, in the clade monocots. Leaves are arranged in groups, with older leaves on the outside, longer and differing in form from the younger leaves they surround. The flowers, peculiar and inconspicuous, are hermaphroditic (they have male and female sexual organs). It can be found at depths of up to 30-40 m. depending on how clear the water is. These meadows produce large amounts of oxygen and organic matter. The leaf terminus is rounded or sometimes absent because of damage. The low winter temperatures mean that the plant’s growth is minimal during this period until the arrival of spring again. The leaves are ribbon-like, appearing in tufts of 6 or 7, and up to 1.5 metres (4.9 ft) long. Posidonia oceanica is a marine phanerogam and therefore reproduces sexually through flowers and fruits. Long live Posidonia Although it looks like a seaweed, it is a very long-lived plant. Sapevi che a Ibiza si sono trovate varietà di Posidonia oceanica con 100.000 anni di antichità, il che significa che stiamo di fronte al secondo organismo più longevo del pianeta? About Prestige Properties; Our Team. Purity and Clarity of its waters, filtered by the largest and oldest living being in the world, The Oceanic Posidonia, with its 8 km of extension and 100,000 years of age, was declared a World Heritage Site by UNESCO, offers visitors unique beaches in the Mediterranean. One thing that surprises everyone who comes to our coast for the first time is how clear the sea water is. Several authors cite the negative effect that the appearance of invasive algae species in Mediterranean waters, such as Lophocladia lallemandii or Caulerpa racemosa, has on the seagrass meadows. Posidonia meadows can be more than 1000-years-old and are recognised by UNESCO as World Heritage. Posidonia oceanica es una planta acuática, endémica del Mediterráneo, perteneciente a la familia Posidoniaceae.Tiene características similares a las plantas terrestres, como raíces, tallo rizomatoso y hojas cintiformes de hasta un metro de largo dispuestas en matas de 6 a 7. Honesty, respect and love for our island are what drive the team at Prestige Properties. It reproduces through runners (horizontal growth shoots) that form a meadow. Photo about Posidonia oceanica fiber balls on the beach. Posidonia or seagrass meadows is a species in the Mediterranean Sea that is not found anywhere else in the world. Although living underwater, it is not an algae but a real plant with roots, stems and leaves. Los fondos marinos de las islas de Ibiza y Formentera albergan el organismo vivo más grande del mundo, unas extensas praderas de Posidonia oceánica de ocho kilómetros de longitud con más de 100.000 años de vida, declaradas Patrimonio Mundial por la UNESCO. This helps maintain the balance of these sediments by forming barrier reefs, maintaining the coastline and protecting our beaches from erosion. 3% of the Mediterranean is covered with Neptune grass. The Balearic Islands and Pityusic Islands (Ibiza, Formentera and other small islets) are home to some 750 km2 of Posidonia meadows growing on sandy seabeds and, in some cases, on rocky seabeds. Seagrass beds are vital for filtering and oxygenating the water, maintaining clear waters necessary for coral reef ecosystems as well as mitigating eutrophication… Proceeds from the Oceanic x Ibiza city-by-city experience were directed to support the Save Posidonia Project by Manu San Felix. [3] Earlier systems classified this genus in the family Potamogetonaceae or in the family Posidoniaceae but belonging to order Zosterales. Posidonia oceanica usually reproduces asexually. oceanica. When summer arrives, the leaves reach their maximum length, and are progressively colonized by organisms and algae that adhere to them forming a dense layer of epiphytic organisms. The archipelago’s meadows are found in diverse locations, but the main concentrations are found in Ses Salines d’Eivissa i Formentera, in the south of Formentera, Sant Antoni de Portmany, in the south of Menorca, the bays of Alcúdia, Palma and Pollença on the island of Mallorca, and Cabrera. These underwater meadows, are very important in the world’s ecosystems. [11], Media related to Posidonia oceanica at Wikimedia Commons. - One single Posidonia plant of 8 kilometers long, is considered the … Without it, the waters of Ibiza and Formentera would not be what they are. Posidonia oceanica, commonly known as Seagrass, is an angiosperm plant, adapted to underwater life. The Angiosperm Phylogeny Website concludes that the three families Cymodoceaceae, Posidoniaceae and Ruppiaceae form a monophyletic group. It forms large underwater meadows that are an important part of the ecosystem. Its flowers indicate that this plant was once a land plant that adapted to living under the sea as, under the sea, flowers do not need to attract insects for pollination to transport pollen. On the other hand, the meadows work as large filters, helping to keep the seawater clean and clear. It's still got magic; Giménez describes the island's ecosystems: salt flats, coves and marine nature reserves thick with Posidonia oceanica, … It contains nine species of marine plants (" seagrass "), found in the seas of the Mediterranean and around the south coast of Australia. De tot 1 meter lange planten vormen dichte bossen op zandbodems op een diepte van 2-25 meter. Founded by Pascale Dufournier in 1983, Prestige Properties has been helping Ibiza property owners, buyers and tenants, to rent, purchase and sell their homes in Ibiza for more than 35 years. Lack of awareness among skippers and fishermen means that this is a common occurrence, causing the direct uprooting of the plant. Subsurface rhizomes and roots stabilize the plant while erect rhizomes and leaves reduce silt accumulation. In the past, Posidonia leaves were used as insulation on the roofs of farmhouses, as bedding for livestock, and to pack fragile materials. FOR MORE INFORMATION ABOUT POSIDONIA SEE: In order to raise awareness of its importance to residents and tourists on the island, the Ibiza Town Council launched ‘Vive la Posidonia’ (long live Posidonia), a project to raise awareness and provide information about the importance of the seagrass meadows and how to protect them. – About 1,000 different species of animals live together in the Posidonia meadows because it provides shelter and food. Our Website uses cookies to improve your experience. Posidonia Oceanica is an underwater plant that is mostly found in the Mediterranean Sea. Hoewel het onder water leeft, is het geen algen maar een echte plant met wortels, stengels en bladeren. The genus Posidonia is named after Poseidon, the Greek god of the seas, while oceanica refers to its former wide distribution. Save Posidonia Project is a project born from the commitment of the Island Council of Formentera (Balearic Islands) to promote sustainable tourism and its aspiration to launch an action plan to raise funds that will be used exclusively for the conservation of the marine plant Posidonia oceanica. Posidonia oceanica meadows occupy large expanses of the Mediterranean coastline, playing an important role in sedimentary dynamics (by holding the sediment in place with their roots). Posidonia Oceanica:a plant with exceptional virtues. POSIDONIA OCEANICA. On the other hand, as a species that grows in shallow water, it is often affected by boat anchoring. [citation needed] Average leaf width is around 10 millimetres (0.39 in). [10], To date 51 natural products have been reported from P. oceanica, including natural phenols, phenylmethane derivatives, phenylethane derivatives, phenylpropane derivatives and their esters, chalkones, flavonols, 5-alpha-cholestanes, and cholest-5-enes. Florece en otoño y produce en primavera frutos flotantes conocidos vulgarmente como olivas de mar. They are also important areas in terms of oxygen production and in providing breeding grounds and shelter for many animal species. This page was last edited on 27 August 2020, at 04:07. Posidonia leaves, which can be over 2 meters high and up to 20 meters wide, also form compact and resistant structures along shores that provide a very effective protection against erosion. Posidonia Oceanica is a seagrass species endemic to the Mediterranean Sea and a vital component of Ibiza’s fragile marine ecosystem. At 8 kilometres (5.0 mi) across, and estimated at around 100,000 years old,[5] it may be one of the largest and oldest clonal colonies on Earth. La Posidonia oceanica es una planta marina y no un alga, que tiene raíz, tallo, hojas, frutos y flors. The main threats for the meadows are the maritime constructions, the pollution of near-shore waters, the anchoring, the beach … La Posidonia oceánica es una planta marina endémica del Mediterráneo que no se encuentra en ningún otro mar del mundo. [9] The presence of Posidonia can be detected by the masses of decomposing leaves on beaches. The aim is to raise awareness about the vital importance of Posidonia on Formentera in the present and especially for future generations. It protects beaches from erosion and protects the coastline. Today we explain to you why it is so important and why it is necessary to be aware of responsible anchoring to avoid its deterioration.. This seagrass is a key element of the underwater ecosystems that so many Mediterranean species depend on for survival. Posidonia oceanica has a clear annual growth and leaf-loss cycle.In spring, Posidonia leaves start to grow faster as the temperature rises. It reproduces through runners (horizontal growth shoots) that form a meadow. 5. Posidonia oceanica seagrass is unique to the Mediterranean Sea and forms vast underwater meadows that are critical to Ibiza and Formentera’s ecosystem. In 1999 Posidonia fields in Ibiza and Formentera have been declared world heritage site by UNESCO! If possible, verify the text with references provided in the foreign-language article. In that same year such emblematic sites as the Phoenician settlement of Sa Caleta were also declared World Heritage Sites. This arrangement of the rhizomes eventually forms a mat; the surface contains the active parts of the plant, whereas the center is a dense network of roots and decomposing stems. Posidonia Oceanica is a seagrass, also called Neptune grass. - This sea plant, endemic of the Mediterranean, got its name from the greek god Poseidon. The plant loses its leaves in autumn as the water temperature decreases and the frequency of storms increases. What follows is an explanation of the Posidonia oceanica, its ecosystem, and its impact on related ecosystems. La contaminación y los fondeos son los mayores peligros que sufre la Posidonia, un organismo cuyo hábitat no debe ser alterado. Its importance is so great that in 1999 UNESCO conferred World Heritage status on it, the first natural good in the Mediterranean to receive this award recognizing its beauty and uniqueness. [6][7][8], This species is found only in the Mediterranean Sea where it is in decline, occupying an area of about 3% of the basin. This corresponds to a surface area of about 38,000 square kilometres (15,000 sq mi). Official tourism site of the City Council of Sant Josep de Sa Talaia, © Ajuntament de Sant Josep de Sa Talaia 2020, #LoveSantJosep, the hashtag on Instagram where you can share the most beautiful pictures of Sant Josep, Sant Agustí Church, 200 years of history and adversity. It is found at depths from 1–35 metres (3.3–114.8 ft),[citation needed] according to water clarity. Posidonia oceanica is a marine phanerogam and therefore reproduces sexually through flowers and fruits. Posidonia oceanica usually reproduces asexually. Pergent, G., Semroud, R., Djellouli, A., Langar, H. & Duarte, C. 2010. Posidonia oceanica is the most precious treasure of our sea. One of the most extensive is found between Ibiza and Formentera and it is estimated that posidonia can measure up to 8 km. A turquoise blue sea, white sand banks and the dark green of Posidonia Meadows are the colors with which Formentera receives the visitor. Learn how and when to remove this template message, "Portuguese scientists discover world's oldest living organism", "Implications of Extreme Life Span in Clonal Organisms: Millenary Clones in Meadows of the Threatened Seagrass Posidonia oceanica", http://www.tirsavplus.eu/documenti/normativa/D_lgs_75_2010%20normativa_fertilizzanti.pdf, https://en.wikipedia.org/w/index.php?title=Posidonia_oceanica&oldid=975171594, Articles needing translation from Italian Wikipedia, Articles needing additional references from August 2019, All articles needing additional references, Articles with unsourced statements from August 2019, Creative Commons Attribution-ShareAlike License. [4], In 2006 a huge clonal colony of P. oceanica was discovered south of the island of Ibiza and stretches as far south as La Savina and Es Pujols on the island of Formentera. But they are being seriously impacted by the growth of tourism and recreational boat use. This means that increased turbidity, whether caused by resuspension of sediment or spillage, adversely affects the meadow. Forma praderas entre la superficie y los 40 metros de profundidad en aguas de gran calidad como las de Formentera. Posidonia Oceanica (ook wel “Posidonia herbarium” genoemd) is een plant die voornamelijk in de Middellandse Zee voorkomt. – Its potential for biogas production is currently being explored. Posidonia has flat ribbon-like leaves that are approximately 1 cm wide and 10 to 150 cm long depending on the season, Posidonia oceanic tufts grow into extensive underwater meadows constituting very stable and long-living structures (the meadow located in the Ses Salines d’ Eivissa i Formentera Natural Park is one of the oldest living things in the world). Posidonia Oceanica Posidonia Meadows are extremely important for the environment, given that they are the natural habitat for a vast biodiversity. During winter the plant has only a few leaves that are short and young. Deze zeegrasvelden vormen een belangrijk ecosysteem, en een kweekplaats voor allerlei organismen, … [citation needed] The leaves are bright green, perhaps turning brown with age, and have 13 to 17 parallel veins. The project includes activities that combine art, nature and gastronomy. Posidonia oceanica is a type of seagrass found in the Mediterranean. – One square metre of meadow can produce 14 litres of oxygen per day. It also helps to reduce marine hydrodynamics and thus reduces erosion caused by it. It is found at depths from 1–35 metres (3.3–114.8 ft), according to water clarity. Saviez-vous qu’à Ibiza plusieurs variétés de Posidonia oceánica âgées de 100 000 ans ont été découvertes, ce qui représente que nous sommes face au second organisme vivant le plus âgé de la planète ? Declared as World Heritage by UNESCO, Posidonia is a marine plant endemic to the Mediterranean. Ibiza and its smaller counterpart, Formentera, are both highly fertile islands; abundant with marine life surrounding their coasts, including the vast meadows of the Posidonia oceanica. – It is estimated to be about 100,000 years old (it grows between 1 and 2 centimetres per year). But, what exactly is Posidonia? Carl Linnaeus gave the first botanical description of this species in Systema Naturae, although the genus was then named Zostera. Image of flora, europe, botanical - 166315300 Posidonia Oceanica Fiber Balls In Ibiza Island Stock Photo - Image of flora, europe: 166315300 De aanwezigheid ervan in water is gunstig omdat het grote hoeveelheden zuurstof produceert. Posidonia extends from Formentera to Ses Salines beach in Ibiza, is an area rich in species, in addition to being the habitat responsible for the turquoise color and transparency of the waters of both islands, for this reason is one of the most interesting areas for diving in the Mediterranean. 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